彭桓武理论物理创新研究中心“2025引力波物理研讨会”

Session

19 Oct 2025, 14:00

Lecture Hall, 3rd Floor, Building 7, "Eoc·Economy" Senior Talent Hub（两山高层次人才集聚区-7号楼3层报告中心）

Conveners

Parallel-1

• Da Huang (National Astronomical Observatories, Chinese Academy of Sciences)

Contribution list Timetable

39. Testing GUT phase transition via inflated gravitational waves

Ye-Ling Zhou (HIAS-UCAS)

19/10/2025, 14:00

13. Phase Transition Gravitational Waves as a Unique Discriminant for Warm Inflation

Xiao-Bin Sui

19/10/2025, 14:20

We investigate the properties of gravitational waves generated by heating-induced phase transitions in warm inflation. In this scenario, the heating phase of inflation followed by subsequent cosmological cooling can trigger two associated first-order phase transitions and generate characteristic gravitational waves. The correlated gravitational wave spectral features—amplitude, peak...

16. Enhancement of first-order phase transitions through a mass-acquiring scalar field

Mr Yuanjie Li (University of Chinese Academy of Science)

19/10/2025, 14:40

Phase transitions in the early Universe give rise to effective masses for massless fields in the symmetry-broken phase. We use the lattice simulations to investigate the impact of a spectator scalar field with mass generation on the dynamics of first-order phase transitions and the generation of gravitational waves. In addition to the well-known friction effects, we identify a novel effect...

11. Acoustic gravitational waves from primordial curvature perturbations

Zhuan Ning (HIAS and ITP-CAS)

19/10/2025, 15:00

Primordial curvature perturbations seed both primordial black holes (PBHs) and scalar-induced gravitational waves (SIGWs). However, the standard second-order perturbative calculation of SIGWs omit important nonlinear effect. Once these perturbations re-enter the horizon, their gravitational collapse and subsequent nonlinear hydrodynamic evolution excite strong sound waves in the primordial...

45. Scalar-induced gravitational waves with non-Gaussianity up to all orders

Xiang-Xi Zeng (ITP, CAS)

19/10/2025, 15:20

Scalar-induced gravitational waves (SIGWs) are ubiquitous in many early-Universe processes accompanied by non-Gaussianity; hence, precise calculations of SIGWs involve a full understanding of non-Gaussianity. In this Letter, we propose to use the lattice simulations to directly calculate the energy density spectra of SIGWs with non-Gaussianity up to all orders. Our proposal has been first...

54. Strong backreaction of gauge quanta produced during inflation and the sourced GWs

Jian-Feng He (ITP, CAS)

19/10/2025, 15:40

In this report, I will introduce our recent studies about the axion-gauge system during inflation, mainly focusing on the strong backreaction region. With a linear axion potential, we found that a steeper slope can enhance the gauge quanta production, while a larger coupling cannot increase it. We then apply this result to a realistic model with cosine axion potential, finding the quantum...