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BEGIN:VEVENT
SUMMARY:Gravitational waves from the early primordial black hole dominatio
 n
DTSTART;VALUE=DATE-TIME:20260521T094500Z
DTEND;VALUE=DATE-TIME:20260521T100000Z
DTSTAMP;VALUE=DATE-TIME:20260530T105144Z
UID:indico-contribution-555-2482@indico.itp.ac.cn
DESCRIPTION:Speakers: Xin-Chen He (University of Science and Technology of
  China/Asia Pacific Center for Theoretical Physics)\nUltra-light primordia
 l black holes (PBHs)\, formed from small-scale fluctuations\, could tempor
 arily dominate the energy density of the early universe and leave distinct
 ive gravitational-wave (GW) signatures through their evaporation. These si
 gnals provide a novel window into the PBH mass\, abundance\, spatial distr
 ibution\, and evaporation process. In this talk\, the speaker will discuss
  how induced GWs generated from the evaporation of ultra-light PBHs can be
  used to probe the effects of small-scale primordial non-Gaussianities\, a
 s well as the impact of extended PBH mass functions on the resulting GW sp
 ectrum.\n\nhttps://indico.itp.ac.cn/event/419/contributions/2482/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2482/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massive inflationary amplitudes: new representations and degenerat
 e limits
DTSTART;VALUE=DATE-TIME:20260521T093000Z
DTEND;VALUE=DATE-TIME:20260521T094500Z
DTSTAMP;VALUE=DATE-TIME:20260530T105144Z
UID:indico-contribution-555-2481@indico.itp.ac.cn
DESCRIPTION:Speakers: Jiaju Zang (Tsinghua University)\nThe particle model
  building of cosmological collider physics often involves boost-breaking b
 ilinear mixing between a heavy particle and the nearly massless inflaton m
 ode. In cosmological correlators\, such a mixing is obtained by taking a f
 olded limit of a generic tree graph\, which is a special case of degenerat
 e kinematics. In this work\, we continue our exploration of massive inflat
 ionary amplitudes with a focus on degenerate kinematics. With a suitable c
 hange of variables\, we derive new differential equations and full analyti
 cal solutions for generic tree graphs\, making it trivial to take the fold
 ed limit and partial-energy limit at a vertex. Our result shows that folde
 d tree graphs generally involve functions of smaller transcendental weight
 s than their nondegenerate counterparts. In particular\, the inflaton bisp
 ectrum with triple massive exchanges can be expressed in terms of a trivar
 iate Kampé de Fériet function and simpler hypergeometric functions.\n\nh
 ttps://indico.itp.ac.cn/event/419/contributions/2481/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2480@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2479@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2464@indico.itp.ac.cn
DESCRIPTION:Speakers: Anxianyi Xiong (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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2459@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2452@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2451@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2456@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2472@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2474@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2447@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2466@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 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:20260530T105144Z
UID:indico-contribution-555-2442@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:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2442/
END:VEVENT
END:VCALENDAR