The 2023 Shanghai Symposium on Particle Physics and Cosmology: Phase Transitions, Gravitational Waves, and Colliders (SPCS 2023)

Session

Parallel 2

23 Sept 2023, 19:00

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Conveners

Parallel 2

• Yanlin Liu (Shandong Univ. (CN))

1. Gravitational waves from Dark Phase Transitions at Strong Coupling

Nicklas Ramberg (JGU Mainz)

23/09/2023, 19:00

In this talk, we demonstrate how to predict the gravitational wave spectra of Strongly coupled QFTs using holography and lattice data input for a pure SU(N) Yang-Mills theory with small uncertainties. We will elaborate on how we obtain an effective potential using holography with the free energy landscape approach and formulate an effective action. Once the effective action is in our grasp, we...

2. Cosmic Stasis from Primordial-Black-Hole Evaporation and Its Phenomenological Implications

Fei Huang (Weizmann Institute of Science)

23/09/2023, 19:20

Cosmic stasis is a phenomenon in which the abundances of multiple cosmological energy components — components such as matter, radiation, or vacuum energy — remain effectively constant despite the expansion of the universe. One mechanism which can give rise to an extended period of cosmic stasis is the evaporation of a population of primordial black holes (PBHs). In this talk, I review how PBH...

5. Stochastic gravitational wave background: birth from axionic string-wall death

Shuailiang Ge (Peking University)

23/09/2023, 19:40

This talk is based on the paper arXiv: 2307.08185. I will introduce a new source of stochastic gravitational wave background (SGWB) from the final collapse of a string-wall network. In the context of $N_{\rm DW}=1$ axionic string-wall network, the final collapse of walls bounded by strings can release gravitational waves (GWs). This source is typically considered negligible due to its...

59. Gravitational Waves Produced by Domain Walls During Inflation

Chen Yang

23/09/2023, 20:00

31. Instability of the Electroweak Vacuum in Starobinsky Inflation

Qiang Li

23/09/2023, 20:20

We study the stability of the electroweak vacuum during and after the Starobinsky inflation, assuming the existence of the non-minimal Higgs coupling to the Ricci scalar. In the Starobinsky inflation, there exists R2 term (with R being the Ricci scalar), which modifies the evolution equation of the Higgs field. We consider the case that the non-minimal coupling is sizable so that the quantum...