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BEGIN:VEVENT
SUMMARY:Gravity and Cosmology -my personal recollections and perspectives-
DTSTART;VALUE=DATE-TIME:20260522T080000Z
DTEND;VALUE=DATE-TIME:20260522T090000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2454@indico.itp.ac.cn
DESCRIPTION:Speakers: Misao Sasaki (APCTP)\nI will talk about various topi
 cs in gravity and cosmology which I have been studying through my academic
  life\, and discuss my personal perspectives.\n\nhttps://indico.itp.ac.cn/
 event/419/contributions/2454/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2454/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Treatment of Black Hole Superradiance
DTSTART;VALUE=DATE-TIME:20260522T065000Z
DTEND;VALUE=DATE-TIME:20260522T072000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2468@indico.itp.ac.cn
DESCRIPTION:Speakers: Huiyu Zhu (Institute for Basic Science)\nRotating bl
 ack holes can form dense boson clouds through superradiant instability\, m
 aking Kerr black holes a powerful probe of ultralight massive bosons. Prev
 ious studies of black hole superradiance have often treated bosonic fields
  classically\, leaving open questions about how particles are produced and
  how the clouds grow over time. In this work\, we canonically quantize a m
 assive scalar field around a Kerr black hole\, providing a fully quantum d
 escription of black hole superradiance. We show that the evolution of the 
 particle number in the cloud\, as well as the energy and angular momentum 
 of the scalar field\, can be consistently explained within the standard fr
 amework of quantum field theory in curved spacetime. Furthermore\, we prov
 e that the growth of the cloud occurs independently of the choice of initi
 al state. We also explore several phenomena related to a massive scalar fi
 eld in a rotating black hole spacetime\, including Hawking radiation\, adi
 abatic backreaction on the black hole spin\, and the direction of level tr
 ansitions in the presence of self-interactions of the field. Our analysis 
 provides a consistent quantum-mechanical perspective that includes all the
 se phenomena.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2468/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2468/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Nonlinear Tails of Black Hole Ringdown
DTSTART;VALUE=DATE-TIME:20260522T061000Z
DTEND;VALUE=DATE-TIME:20260522T065000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2462@indico.itp.ac.cn
DESCRIPTION:Speakers: Sam Wong (City University of Hong Kong)\nBlack hole 
 perturbation theory is a cornerstone of gravitational wave science\, provi
 ding a powerful framework to test General Relativity in the strong-field r
 egime and to characterize the final remnant of a binary merger. The final 
 "ringdown" phase\, where the newly formed black hole settles into its stat
 ionary state\, is a particularly clean probe of its fundamental properties
 . In this talk\, I will begin by reviewing the essential structure of the 
 Green's function in black hole perturbation theory\, which governs the res
 ponse of the black hole to any disturbance. I will then present our main r
 esult on the late-time behavior of gravitational waves\, demonstrating the
  existence of non-linearly generated power-law tails that dominate after t
 he initial ringdown signal has decayed. We show that this late-time tail i
 s a generic and robust feature for spinning black holes\, carrying importa
 nt information about the nonlinear nature of spacetime dynamics. If time p
 ermits\, I will also briefly discuss the connection between these nonlinea
 r phenomena and the behavior of tidal Love numbers during the inspiral pha
 se.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2462/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2462/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On cosmological properties of black-hole hair in linearly coupled 
 scalar–Gauss–Bonnet theory
DTSTART;VALUE=DATE-TIME:20260522T053000Z
DTEND;VALUE=DATE-TIME:20260522T061000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2438@indico.itp.ac.cn
DESCRIPTION:Speakers: Dražen Glavan (Institute of Physics of the Czech Ac
 ademy of Sciences)\nWe investigate the superhorizon behavior of scalar hai
 r sourced by black holes in de Sitter spacetime in the linearly coupled sh
 ift-symmetric scalar--Gauss--Bonnet theory. This hair exhibits both spatia
 l and temporal growth\, which has been suggested to be problematic. We sho
 w that this growth is expected\, as it is not a special consequence of the
  black hole\, but instead follows from the dynamics of a minimally coupled
  massless scalar field in expanding de Sitter spacetime. Moreover\, it is 
 not specific to black holes\, but also arises for a point scalar charge in
  de Sitter\, indicating that a scalarized black hole acts effectively as a
  localized subhorizon source of scalar perturbations. Backreaction\, when 
 important\, first arises on subhorizon scales and does not by itself elimi
 nate the superhorizon profile. The time-dependent scalar hair also carries
  a steady outward energy flux\, which helps explain the difficulties encou
 ntered in attempts to construct self-consistent static solutions.\n\nhttps
 ://indico.itp.ac.cn/event/419/contributions/2438/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2438/
END:VEVENT
BEGIN:VEVENT
SUMMARY:FoPTs\, PBHs\, SIGWs\, and SWs from early Universe
DTSTART;VALUE=DATE-TIME:20260522T032000Z
DTEND;VALUE=DATE-TIME:20260522T040000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2461@indico.itp.ac.cn
DESCRIPTION:Speakers: Shao-Jiang Wang (	Institute of Theoretical Physics\,
  Chinese Academy of Sciences)\nIn this talk\, I will first introduce our r
 ecent progress in first-order phase transitions\, in particular\, generati
 ons of density perturbations\, formations of PBHs\, associated scalar-indu
 ced gravitational waves\, and productions of sound waves from gravitationa
 l instability.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2461/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2461/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unified Origin of Primordial Black Hole Dark Matter and Nanohertz 
 Gravitational Waves
DTSTART;VALUE=DATE-TIME:20260522T024000Z
DTEND;VALUE=DATE-TIME:20260522T032000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2450@indico.itp.ac.cn
DESCRIPTION:Speakers: Shi Pi (Institute of Theoretical Physics\, Chinese A
 cademy of Sciences)\nRecent high-cadence observations by Subaru-HSC have i
 dentified a population of ultrashort-timescale microlensing events\, provi
 ding a compelling window for planet-mass primordial black holes (PBHs) to 
 constitute the entirety of dark matter. In this Letter\, we demonstrate th
 at this PBH population and the nanohertz stochastic gravitational-wave (GW
 ) background reported by pulsar timing arrays (PTAs) can be naturally unif
 ied by a single primordial origin: a broad\, nearly-flat enhancement of th
 e curvature power spectrum with an amplitude of O ( 1 0 − 2 ) O(10 −2 
 ). The resulting PBH mass function spans the planet-to-solar mass range\, 
 while remaining consistent with all current observational constraints. Thi
 s unified PBH--induced-GW framework makes concrete multi-messenger predict
 ions\, which can be decisively scrutinized by forthcoming microlensing sur
 veys\, next-generation PTAs\, space-borne interferometers\, precision astr
 ometry\, and laser ranging experiments.\n\nhttps://indico.itp.ac.cn/event/
 419/contributions/2450/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2450/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Learning Gravity from Data: Model-Independent Reconstruction of th
 e Cosmic Expansion and Modified Gravity Theories
DTSTART;VALUE=DATE-TIME:20260522T020000Z
DTEND;VALUE=DATE-TIME:20260522T024000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2434@indico.itp.ac.cn
DESCRIPTION:Speakers: Konstantinos Dialektopoulos (University of Malta)\nT
 he standard cosmological model is under increasing observational pressure.
  Persistent tensions in the Hubble constant and the growth of structure su
 ggest either unaccounted systematics or genuine new physics beyond ΛCDM 
 — and distinguishing between these possibilities demands data analysis m
 ethods that do not smuggle in theoretical priors through the back door. In
  this talk\, I present a programme of model-independent reconstruction of 
 late-time cosmology using machine learning to probe both the expansion his
 tory of the Universe and the underlying theory of gravity.\n\nhttps://indi
 co.itp.ac.cn/event/419/contributions/2434/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2434/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20260521T093000Z
DTEND;VALUE=DATE-TIME:20260521T094500Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2481@indico.itp.ac.cn
DESCRIPTION:Speakers: Jiaju Zang (Tsinghua University)\nTBA\n\nhttps://ind
 ico.itp.ac.cn/event/419/contributions/2481/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2481/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massive Inflationary Amplitudes: Family-Tree Decomposition of Loop
  Integrands
DTSTART;VALUE=DATE-TIME:20260521T091500Z
DTEND;VALUE=DATE-TIME:20260521T093000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2480@indico.itp.ac.cn
DESCRIPTION:Speakers: Yuanzhao Li (Tsinghua University)\nCosmological corr
 elators with massive loop exchanges appear frequently in cosmological coll
 ider model building as promising sources of oscillatory signals. However\,
  their computations remain challenging. In this work\, we apply the family
 -tree decomposition to correlators at loop level and derive rules to direc
 tly write down analytic answers for arbitrary massive loop integrands in t
 erms of dressed family-tree functions. We also derive a complete set of di
 fferential equations satisfied by arbitrary loop integrands. Finally\, we 
 demonstrate how to perform loop momentum integrals and extract the complet
 e nonlocal cosmological collider signals for a few examples\, among which 
 the results for 1-loop triangle graph and multiloop melon graph are new.\n
 \nhttps://indico.itp.ac.cn/event/419/contributions/2480/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massive Inflationary Amplitudes: Differential Equations and Comple
 te Solutions for General Trees
DTSTART;VALUE=DATE-TIME:20260521T090000Z
DTEND;VALUE=DATE-TIME:20260521T091500Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2479@indico.itp.ac.cn
DESCRIPTION:Speakers: Haoyuan Liu (Tsinghua University)\nWe construct and 
 solve a complete system of differential equations for general tree-level i
 nflation correlators with an arbitrary number of massive scalar exchanges 
 and time-dependent couplings. Any massive tree correlators can be uniquely
  fixed by solving this system of equations with appropriate boundary condi
 tions. We take a hybrid approach to solve this system\, using the differen
 tial equation to get the inhomogeneous solution and the bulk time integral
 s to determine the homogeneous solution. Altogether\, we obtain analytical
  results for all tree-level massive inflation correlators with generic kin
 ematics\, expressed as multivariate hypergeometric series of energy ratios
 . The result can be neatly organized as a sum of the completely inhomogene
 ous solution\, which we call the massive family tree\, and all of its cuts
 . As simple applications\, we provide full analytical expressions for tree
  correlators with one\, two\, and three massive exchanges.\n\nhttps://indi
 co.itp.ac.cn/event/419/contributions/2479/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2479/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Superhorizon curvature perturbations in hybrid inflation
DTSTART;VALUE=DATE-TIME:20260521T084500Z
DTEND;VALUE=DATE-TIME:20260521T090000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2464@indico.itp.ac.cn
DESCRIPTION:Speakers: Xiong Anxianyi (ITP-CAS)\nWe utilize the $\\delta N$
  formalism within a parameter space formed by the $e$-folding number $N$ a
 nd its transverse subspace to explicitly account for the geometry of the f
 inal hypersurface in multi-field inflation. Applying this framework to hyb
 rid inflation\, we identify an enhancement mechanism of the curvature pert
 urbation driven by the growing isocurvature perturbation due to the tachyo
 nic instability of the waterfall field. This amplification occurs during t
 he trajectory's turn in field space\, a process qualitatively distinct fro
 m the background deceleration in single-field non-attractor models such as
  ultra-slow-roll. The resulting power spectrum features a broad peak with 
 a characteristic $k^3$ infrared growth and a ultraviolet spectral tilt tha
 t uniquely determines the nonlinear parameter $f_\\mathrm{NL}$ of a logari
 thmic non-Gaussianity\, all of which are primarily governed by the waterfa
 ll dynamics. The enhanced curvature perturbation can simultaneously accoun
 t for primordial black hole dark matter and a stochastic gravitational wav
 e background detectable by LISA\, Taiji\, and TianQin.\n\nhttps://indico.i
 tp.ac.cn/event/419/contributions/2464/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observable Gravitational Wave Strain at Second-order
DTSTART;VALUE=DATE-TIME:20260521T083000Z
DTEND;VALUE=DATE-TIME:20260521T084500Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2459@indico.itp.ac.cn
DESCRIPTION:Speakers: Ao Wang (Institute for Theoretical Physics\, Chinese
  Academy of Science)\nThe definition of second-order gravitational wave (G
 W) strain in cosmological perturbation theory is traditionally ambiguous d
 ue to its dependence on spacetime slicing. This issue is particularly crit
 ical for secondary GWs induced by primordial fluctuations. This talk intro
 duces a gauge-invariant formalism that defines GW strain via the time-dela
 y of electromagnetic signals exchanged between geodesic observers. Our res
 ults confirm that this observable strain aligns with the transverse-tracel
 ess components in the Newton gauge\, providing a robust physical foundatio
 n for interpreting secondary GWs and resolving the gauge-dependence contro
 versy.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2459/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2459/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the survival of strong nuggets in the early Universe
DTSTART;VALUE=DATE-TIME:20260521T081500Z
DTEND;VALUE=DATE-TIME:20260521T083000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2452@indico.itp.ac.cn
DESCRIPTION:Speakers: Haoyang Qi (Peking University)\nStrong nuggets with 
 a baryon number of A=10^10-10^30 could be able to survive from the cosmic 
 separation of the QCD phases\, provided the transition from strange quark 
 matter to strangeon matter is accounted for\, thereby evading evaporation 
 in the early Universe. Such strangeon nuggets may serve as a dark matter c
 andidate within particle standard model. We formulate the corresponding ph
 ase transition of cosmic strange matter\, establishing a parameter space w
 hich reasonably accommodates observational constraints on the dark-to-lumi
 nous matter ratio and the mass-radius relation\, as well as tidal deformab
 ility of compact objects.\n\nhttps://indico.itp.ac.cn/event/419/contributi
 ons/2452/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2452/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BSM-enhanced PBH dark matter
DTSTART;VALUE=DATE-TIME:20260521T080000Z
DTEND;VALUE=DATE-TIME:20260521T081500Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2451@indico.itp.ac.cn
DESCRIPTION:Speakers: Xavier Pritchard (University of Sussex)\nIn this tal
 k I will give an overview of several beyond Standard model theories predic
 ting a large number of additional degrees of freedom. The corresponding so
 ftening in equations of state can be significant. I will show that\, withi
 n these models\, it is then possible to achieve a large enhancement in PBH
  abundance on scales relevant for PBHDM\; namely\, the asteroid mass and m
 emory burden windows.\n\nhttps://indico.itp.ac.cn/event/419/contributions/
 2451/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2451/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primary black-hole scalar charges and kinetic screening in K-essen
 ce-Gauss-Bonnet gravity
DTSTART;VALUE=DATE-TIME:20260521T065000Z
DTEND;VALUE=DATE-TIME:20260521T072000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2456@indico.itp.ac.cn
DESCRIPTION:Speakers: Georg Trenkler (IBS CTPU-CGA)\nBlack holes beyond Ge
 neral Relativity may carry non-standard charges that impact their phenomen
 ology. I will present the scalar charge that is induced by the scalar-Gaus
 s-Bonnet coupling and how it is affected by the presence of a nontrivial k
 inetic term K(X). I will discuss the corresponding kinetic screening in th
 e asymptotically flat\, static solution first. I will then turn to the cas
 e where self-accelerating cosmology is driven by K(X)\, finding that the t
 ime-dependence of the scalar field opens up the parameter space\, turning 
 the black-hole scalar charge from secondary to primary. I will provide a s
 tability analysis and a measure of the intensity of the kinetic screening 
 from the quartic dispersion relation of the mixed scalar and gravitational
  modes.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2456/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2456/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rethinking Gravity: From Torsion and Nonmetricity to Black Holes a
 nd Cosmology
DTSTART;VALUE=DATE-TIME:20260521T061000Z
DTEND;VALUE=DATE-TIME:20260521T065000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2472@indico.itp.ac.cn
DESCRIPTION:Speakers: Sebastian Bahamonde (Institute for Basic Science CTP
 U-CGA)\nEinstein’s theory describes gravity through spacetime curvature\
 , but more general gauge-theoretic frameworks allow spacetime to carry tor
 sion and nonmetricity as well. I will first introduce metric-affine gravit
 y as a framework in which curvature\, torsion\, and nonmetricity have dist
 inct geometric roles\, and discuss the theoretical consequences of these s
 tructures\, including their relation to hypermomentum and intrinsic proper
 ties of matter such as spin\, dilation\, and shear. I will then turn to bl
 ack holes in theories with torsion and/or nonmetricity\, including scalari
 sed black holes and the gravitational spin-orbit effect. Finally\, I will 
 discuss cosmological models with non-Riemannian geometry\, focusing on FLR
 W backgrounds and the propagation of an additional massive spin-2 mode ass
 ociated with torsion.\n\nhttps://indico.itp.ac.cn/event/419/contributions/
 2472/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2472/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extensions of scalar-tensor theory: Parity violation and multiple 
 fields
DTSTART;VALUE=DATE-TIME:20260521T053000Z
DTEND;VALUE=DATE-TIME:20260521T061000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2474@indico.itp.ac.cn
DESCRIPTION:Speakers: Xian Gao (Sun Yat-sen University)\nThis talk present
 s recent progress in the construction of scalar-tensor theories\, with a f
 ocus on parity violation and multiple scalar fields. I will first review t
 he relation between generally covariant scalar-tensor theories and spatial
 ly covariant gravity in the unitary gauge\, emphasizing how this correspon
 dence provides an efficient way to control higher-order time derivatives a
 nd avoid Ostrogradsky ghost degrees of freedom. Using this framework\, I w
 ill discuss the systematic construction of the most general parity-violati
 ng scalar-tensor theory up to d=4 that is ghost-free in the unitary gauge\
 , including the resulting "Qi-Xiu" Lagrangians and their relation to known
  examples such as Chern-Simons and chiral scalar-tensor theories. I will t
 hen describe a new geometric approach to multiple scalar-tensor theories\,
  in which each scalar field defines a foliation of spacelike hypersurfaces
  and the theory is built from the corresponding hypersurface geometric qua
 ntities. This multiple-foliation construction provides a systematic route 
 toward ghost-free multi-field scalar-tensor theories beyond the traditiona
 l Horndeski/DHOST framework.\n\nhttps://indico.itp.ac.cn/event/419/contrib
 utions/2474/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2474/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Entropy Induces Varying-G
DTSTART;VALUE=DATE-TIME:20260521T032000Z
DTEND;VALUE=DATE-TIME:20260521T040000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2447@indico.itp.ac.cn
DESCRIPTION:Speakers: Yen Chin Ong (Nanjing University of Aeronautics and 
 Astronautics)\nI will review the recently proposed GEVAG (generalized entr
 opy and varying-G) theory. This theory gives a consistent treatment of how
  the field equation of gravity should be changed if the area law of horizo
 n entropy is modified\, namely that gravitational constant G is now area-d
 ependent\, the functional form of which depends on the specific modificati
 ons of the entropy. Specifically\, GEVAG was able to prevent the violation
  of the Bekenstein bound\, known to plague various generalized entropies l
 ike Tsallis entropy. When applied to the quantum gravity logarithmic corre
 ction\, the framework managed to derive a modified Hawking temperature tha
 t was previously obtained in the GUP (generalized uncertainty principle) l
 iterature\, but now without explicitly utilizing GUP. This circumvents the
  known problems in the GUP literature that heuristic derivations are often
  unreliable. I will briefly mention how these affect early time cosmology.
 \n\nhttps://indico.itp.ac.cn/event/419/contributions/2447/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2447/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tunneling in cosmology
DTSTART;VALUE=DATE-TIME:20260521T024000Z
DTEND;VALUE=DATE-TIME:20260521T032000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2466@indico.itp.ac.cn
DESCRIPTION:Speakers: Masahide Yamaguchi (IBS CTPU-CGA)\nWe discuss severa
 l aspects of tunneling in cosmology.\n\nhttps://indico.itp.ac.cn/event/419
 /contributions/2466/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2466/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Detection Capability of Multi-band Detectors for Extra Polarizatio
 ns of Gravitational Waves
DTSTART;VALUE=DATE-TIME:20260521T020000Z
DTEND;VALUE=DATE-TIME:20260521T024000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2442@indico.itp.ac.cn
DESCRIPTION:Speakers: Jin Li (Chongqing University)\nThis report explores 
 the detection capabilities of multi-band gravitational wave detectors for 
 extra polarizations beyond general relativity. In the mHz–kHz band\, the
  extended parameterized post-Einsteinian (ppE) framework is applied to spa
 ce-based (e.g.\, LISA\, Taiji\, TianQin) and ground-based (e.g.\, LIGO\, V
 irgo\, KAGRA\, ET) detectors\, showing that multi-band observations effect
 ively break degeneracies and improve constraints on vector and scalar pola
 rizations. In the GHz band\, high-frequency gravitational waves (HFGWs) fr
 om early universe sources (e.g.\, primordial black holes\, brane worlds) a
 re analyzed via the three-dimensional synchronous rotating (3DSR) system\,
  which enables separation of all six polarization states using a photon–
 photon flux (PPF) method. Experimental prospects and sensitivity estimates
  are also discussed. The results highlight that future multi-band GW missi
 ons significantly enhance tests of gravity and probe high-frequency cosmol
 ogical signals.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2442/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2442/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative evolution of the curvature perturbation during in
 flation.
DTSTART;VALUE=DATE-TIME:20260520T094000Z
DTEND;VALUE=DATE-TIME:20260520T101000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2433@indico.itp.ac.cn
DESCRIPTION:Speakers: DIEGO CRUCES (Institute of Theoretical Physics - Chi
 nese Academy of Sciences (ITP\,CAS))\nThe statistical properties of the cu
 rvature perturbation on superhorizon scales during inflation are of signif
 icant phenomenological interest\, with implications ranging from cosmic mi
 crowave background (CMB) observations to primordial black hole (PBH) forma
 tion and induced gravitational waves. In this talk\, I will present and co
 mpare different techniques for computing these properties: the standard δ
 N formalism\, the stochastic δN formalism\, and a novel non-perturbative 
 equation of motion for the superhorizon curvature perturbation. I will cla
 rify the connections between these approaches and specify the regime of va
 lidity for each.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2433/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2433/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiation-reaction effects at 3PN order in scalar-tensor theories
DTSTART;VALUE=DATE-TIME:20260520T091000Z
DTEND;VALUE=DATE-TIME:20260520T094000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2473@indico.itp.ac.cn
DESCRIPTION:Speakers: Eve Dones (IBS CTPU-CGA)\nWith the advent of third-g
 eneration gravitational-wave detectors\, it has become crucial to extend a
 nalytical frameworks used to model waveforms from compact binary systems t
 o alternative theories of gravity. In this talk\, I will present recent re
 sults on radiation-reaction effects in a class of scalar–tensor theories
 . Using the post-Newtonian multipolar post-Minkowskian (PN–MPM) formalis
 m\, we compute the dissipative contributions to the ten Noetherian conserv
 ed quantities\, which can be classified into two types: Schott and pseudo-
 Schott terms. In contrast to general relativity\, where only pseudo-Schott
  terms contribute to the waveform phasing at 4.5PN order for quasi-circula
 r orbits\, we find that Schott terms begin to contribute already at 3PN or
 der\, even in the quasi-circular case. These contributions must therefore 
 be consistently included in the future when extending the energy flux and 
 waveform\, currently known up to 2.5PN order\, to 3PN order.\n\nhttps://in
 dico.itp.ac.cn/event/419/contributions/2473/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2473/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Waves from Mergers of Asymmetric Dark Stars
DTSTART;VALUE=DATE-TIME:20260520T084000Z
DTEND;VALUE=DATE-TIME:20260520T091000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2432@indico.itp.ac.cn
DESCRIPTION:Speakers: Boris Betancourt Kamenetskaia (Institute for Basic S
 cience CTPU-CGA)\nA strongly self-interacting component of asymmetric dark
  matter (DM) particles can form compact dark stars (DSs). These objects ha
 ve a broad spectrum of masses and radii\, with distinct evolution historie
 s from both neutron stars and black holes (BHs). These differences allow a
  population of DSs to contribute significantly to the astrophysical merger
  rate in unique and discernible ways. Specifically\, their merger rate cou
 ld dominate at low redshifts over other sources\, while their mass functio
 n may populate windows outside known astrophysical processes. In this pres
 entation\, I will summarize the structure and formation of DSs within a di
 ssipative model\, and show the enhancement of their merger cross-section d
 ue to tidal deformation effects. From this\, I derive the cosmological DS 
 merger rate and discuss the DM parameter space available for observation. 
 These findings open a new window to probe DM substructure and particle int
 eractions through present and future gravitational wave (GW) observatories
 .\n\nhttps://indico.itp.ac.cn/event/419/contributions/2432/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing Fundamental physics with extreme mass ratio inspirals
DTSTART;VALUE=DATE-TIME:20260520T080000Z
DTEND;VALUE=DATE-TIME:20260520T084000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2439@indico.itp.ac.cn
DESCRIPTION:Speakers: Yungui Gong (Ningbo University)\nExtreme mass ratio 
 inspirals (EMRIs) composed of a stellar-mass object inspiraling into a sup
 ermassive black hole (SMBH)\, emitting GWs in the milli-Hertz band\, are t
 he most promising GW sources for space-based observatories. The rich infor
 mation about the spacetime geometry surrounding the SMBH is encoded in the
  GWs\, making EMRIs an excellent source for studying black hole physics li
 ke the charges carried by black holes and the DM halos around black holes.
  Firstly\, we use EMRIs to probe the charges carried by black holes and th
 e fundamental fields associated with the charges. Then Using the static an
 d spherically symmetric metric for a black hole immersed in dark matter (D
 M) halos with Hernquist\, Burkert\, and Navarro-Frenk-White density distri
 butions\, we study the possibility of the detection of DM halos and the di
 stinction between different DM halos with the extreme mass ratio inspiral 
 systems (EMRIs).\n\nhttps://indico.itp.ac.cn/event/419/contributions/2439/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2439/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes as Laboratory for Dark Matter
DTSTART;VALUE=DATE-TIME:20260520T065000Z
DTEND;VALUE=DATE-TIME:20260520T072000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2435@indico.itp.ac.cn
DESCRIPTION:Speakers: Qianhang Ding (IBS CTPU-CGA)\nThe dark matter surrou
 nding black hole would form dense dark environment\, studying the imprint 
 of dark matter on the observational signals from black hole via accretions
  and dynamical friction could be a dark matter probe. In this talk I am go
 ing to talk about how to study the nature of dark matter from radio\, opti
 cs and gravitational wave channels. With these studies\, black hole would 
 be a promising laboratory for dark matter in future observations.\n\nhttps
 ://indico.itp.ac.cn/event/419/contributions/2435/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2435/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boosted dark matter and directional direct detection
DTSTART;VALUE=DATE-TIME:20260520T061000Z
DTEND;VALUE=DATE-TIME:20260520T065000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2446@indico.itp.ac.cn
DESCRIPTION:Speakers: Takaaki Nomura (Sichuan University)\nWe discuss a tw
 o-component dark matter model in which one component\, heavier dark matter
 \, annihilates into a lighter dark matter. The lighter dark matter is expe
 cted to generate detectable signals in detectors due to its enhanced momen
 tum\, enabling direct detection even for MeV-scale dark matter. We investi
 gate the effectiveness of directional direct detections\, especially the n
 uclear emulsion detector NEWSdm\, in verifying these boosted dark matter p
 articles through nuclear recoil. In particular\, we focus on light nuclei\
 , such as protons and carbon\, as suitable targets for this detection meth
 od due to their high sensitivity to MeV-scale dark matter. By modeling the
  interactions mediated by a dark photon in a hidden U(1)D gauge symmetry f
 ramework\, we calculate the expected dark matter flux and scattering rates
  for various detector configurations. Our results show that nuclear emulsi
 ons have the potential to yield distinct\, direction-sensitive dark matter
  signals from the Galactic center\, providing a new way to probe low-mass 
 dark matter parameter spaces that evade conventional detection methods.\n\
 nhttps://indico.itp.ac.cn/event/419/contributions/2446/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2446/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Role of Dark Higgs Boson in (Astro)Particle Physics and Cosmology
DTSTART;VALUE=DATE-TIME:20260520T053000Z
DTEND;VALUE=DATE-TIME:20260520T061000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2440@indico.itp.ac.cn
DESCRIPTION:Speakers: Pyungwon Ko (KIAS QUC)\nI will describe the landscap
 e of a dark sector with (excited) dark matter and various force mediators 
 controlled by dark gauge symmetry. Then I will discuss the following topic
 s one by one: (i) Why do we have to consider the dark Higgs boson? (ii) Ga
 lactic center gamma-ray excess with dark Higgs (iii) WIMP scenario resurre
 cted with dark Higgs boson (iv) 511 keV gamma ray excess (v) Higgs inflati
 on assisted with dark Higgs field (vi) Other examples where dark Higgs pla
 ys crucial roles\n\nhttps://indico.itp.ac.cn/event/419/contributions/2440/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2440/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping Inflationary New Physics
DTSTART;VALUE=DATE-TIME:20260520T031000Z
DTEND;VALUE=DATE-TIME:20260520T035000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2475@indico.itp.ac.cn
DESCRIPTION:Speakers: Dong-Gang Wang (HKUST)\nOur understanding of the pri
 mordial Universe largely depends on the information from spatial correlati
 ons of cosmic-scale matter distributions. Recently\, the advances of the 
 “cosmological bootstrap” program offers new perspectives and powerful 
 tools to study these cosmological correlators. In this talk\, I will revie
 w the exciting developments along this direction\, with a focus on the phe
 nomenology and observation frontiers. I will first systematically classify
  the primary observational target — primordial non-Gaussianities (bispec
 trum) from cosmic inflation\, incorporating three leading scenarios: singl
 e field inflation\, cosmological colliders and multi-field inflation. Then
 \, I will introduce the recent efforts to bootstrap graviton non-Gaussiani
 ties from massive spinning fields. In the end\, I will present an up-to-da
 te data analysis of the new predictions using the latest CMB data from Pla
 nck satellite. Via both CMB-BEST and Modal pipelines\, we identify the mos
 t significant signal of cosmological collider in the current observation.\
 n\nhttps://indico.itp.ac.cn/event/419/contributions/2475/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrap for Features in Cosmological Correlators
DTSTART;VALUE=DATE-TIME:20260520T024000Z
DTEND;VALUE=DATE-TIME:20260520T031000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2471@indico.itp.ac.cn
DESCRIPTION:Speakers: Yuhang Zhu (IBS-CTPU-CGA)\nCosmological correlators 
 are fundamental observables of early universe cosmology and the main targe
 ts of cosmological surveys. Despite their importance\, computing them rema
 ins notoriously hard. In this talk\, the speaker will show how to bootstra
 p several classes of correlators tied to signatures of observational inter
 est\, including large non-Gaussianities\, primordial features\, and parity
  violation.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2471/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2471/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An On-Shell Bootstrap Program of Cosmological Correlators
DTSTART;VALUE=DATE-TIME:20260520T020000Z
DTEND;VALUE=DATE-TIME:20260520T024000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2463@indico.itp.ac.cn
DESCRIPTION:Speakers: Zhong-Zhi Xianyu (Tsinghua University)\nWe develop a
  new bootstrap strategy for cosmological correlators at loop level\, which
  we call spectral dispersion. It is based on two conceptual observations t
 hat a correlator can be recovered from its on-shell data\, also known as n
 onlocal signals\, by analyticity up to local counterterms\, and that the o
 n-shell data for a loop process take the form of a discrete sum over quasi
 normal modes. Technically\, our method combines the dS spectral decomposit
 ion with dispersion relations. Using this technique\, we bootstrap new res
 ults in a simple and intuitive form for 3-point and 4-point correlators wi
 th 1-loop massive exchanges of scalar and vector bosons\, either directly 
 or derivatively coupled. Applications of this bootstrap technique to highe
 r spins and higher-loop banana graphs are also straightforward.\n\nhttps:/
 /indico.itp.ac.cn/event/419/contributions/2463/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2463/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Administrative Announcements
DTSTART;VALUE=DATE-TIME:20260520T015500Z
DTEND;VALUE=DATE-TIME:20260520T020000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2478@indico.itp.ac.cn
DESCRIPTION:Speakers: Atsuhisa Ota (Chongqing University)\nhttps://indico.
 itp.ac.cn/event/419/contributions/2478/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2478/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening remarks: On behalf of the co-organizer
DTSTART;VALUE=DATE-TIME:20260520T015000Z
DTEND;VALUE=DATE-TIME:20260520T015500Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2477@indico.itp.ac.cn
DESCRIPTION:Speakers: Masahide Yamaguchi (IBS CPTU-CGA)\nhttps://indico.it
 p.ac.cn/event/419/contributions/2477/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2477/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening remarks: On behalf of the host institution
DTSTART;VALUE=DATE-TIME:20260520T014500Z
DTEND;VALUE=DATE-TIME:20260520T015000Z
DTSTAMP;VALUE=DATE-TIME:20260512T210736Z
UID:indico-contribution-419-2390@indico.itp.ac.cn
DESCRIPTION:Speakers: Xing-Gang Wu (Chongqing university)\nhttps://indico.
 itp.ac.cn/event/419/contributions/2390/
LOCATION:Library (图书馆) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2390/
END:VEVENT
END:VCALENDAR