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

Session

Parallel 1

23 Sept 2023, 19:00

Tsung-Dao Lee Institute/S5F-S500 - Lecture Hall (Tsung-Dao Lee Institute)

Conveners

Parallel 1

• Ligang Xia

11. Hydrodynamic sound shell model and bubble wall velocity

Zi-Yan Yuwen (Institute of Theoretical Physics, Chinese Academy of Sciences)

23/09/2023, 19:00

For a cosmological first-order phase transition in the early Universe, the associated stochastic gravitational wave background is usually dominated by sound waves from plasma fluid motions, which have been analytically modeled as a random superposition of freely propagating sound shells but with the force by the scalar field that produces the self-similar profile removed. Recently, we proposed...

17. Confinement Phase Transition with Quasi-paticle model and its Gravitational wave signal

Jiang Zhu (Shanghai jiao tong Univercity)

23/09/2023, 19:20

It is challenging to build a model that can correctly and unifiedly account for the deconfinement phase transition and thermodynamics of the hot $SU(N)$ pure Yang-Mills (PYM) system, for any $N$. In this article, we slightly generalize the massive PYM model to the situation with a quasigluon mass $M_g(T)$ varying with temperature, inspired by the quasigluon model. In such a framework, we can...

21. Electroweak sphalerons, scalar multiplets, and symmetry breaking patterns

Yanda Wu

23/09/2023, 19:40

In this study, we present a comprehensive analysis of the electroweak sphaleron formalism and its application to electroweak phase transition (EWPT) patterns in extensions of the Standard Model scalar sector with electroweak multiplets. We offer an equivalence proof for different choices for the form of sphaleron configurations; construct the previously unestablished high-dimensional...

58. Lattice study of singlet-assisted electroweak phase transition

Guotao Xia

23/09/2023, 20:00

In this study, we use lattice to reveal nonperturbative information of the electroweak phase transition in the real-singlet extension of the Standard Model, based on the 2-loop 3D EFT framework.
Importantly, the new information is that the lattice determines the true nature of the electroweak phase transition, capable to identify it as the first order type or not, an important qualitative...

29. Bubble Expansion at Strong Coupling & General Backreaction Force

Jun-Chen Wang (Peking University)

23/09/2023, 20:20

In this report, we show our recent two works. In one of the works, we focus on the backreaction force and point out that besides the friction force, the thermal force should also be taken into consideration. Besides the plasma near the wall, the sound shell and the shock front will also contribute to the backreaction force. In the other work, we derive the test formula for the holographic...

30. A new approach to rescue the trapped vacuum

Dr Dongdong Wei (Sun Yat-sen University)

23/09/2023, 20:40

The first-order phase transition is one of the promising scenarios as it can explain the observed matter-antimatter asymmetry of the early universe. In most cases, the transition proceeds through the nucleation of bubbles of the true vacuum. If the nucleation rate is highly suppressed, then vacuum trapping may occur so that the transition ceases. In this work, we will discuss a new approach...