The 2024 Chengdu Symposium on Particle Physics and Cosmology: Phase Transitions, Dark Matter and Experimental Probes (CPCS 2024)

Session

Collider and Dark Matter

29 Sept 2024, 13:20

12. Baryogenesis, Dark Matter, and PTA signal from a Dark Conformal Phase Transition

Sudhakantha Girmohanta (Tsung-Dao Lee Institute and Shanghai Jiao Tong University)

29/09/2024, 13:20

We consider the intriguing possibility that the recently reported nano-Hz gravitational wave signal by Pulsar Timing Array (PTA) experiments is sourced by a strong first-order phase transition from a nearly conformal dark sector. The phase transition has to be strongly supercooled to explain the signal amplitude, while the critical temperature has to be in the ${\cal O}(GeV)$ range, as...

28. Phenomenological aspects of dark QCD at QCD scale inspired by strong CP problem

Bin Wang (Jilin University)

29/09/2024, 13:40

We discuss a QCD-scale composite axion model arising from dark QCD coupled to QCD. The presently proposed scenario not only solves the strong CP problem, but also is compatible with the preheating setup for the QCD baryogenesis. The composite axion is phenomenologically required to mimic the QCD pion, but can generically be flavorful, which could be testable via the induced flavor changing...

5. Recent ATLAS results of Dark Matter and Dark Photon combinations, and Dark Higgs searches

Ngoc Khanh Vu (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)

29/09/2024, 14:00

Ref: https://arxiv.org/abs/2306.00641
Science Bulletin (doi:10.1016/j.scib.2024.06.003)
Results from a wide range of searches targeting different experimental signatures with and without missing transverse momentum ($𝐸^{𝑚𝑖𝑠𝑠}_{𝑇}$) are used to constrain a Two-Higgs-Doublet Model (2HDM) with an additional pseudo-scalar mediating the interaction between ordinary and dark matter (2HDM+a). The...

4. Recent progress of Dark SHINE R&D

Kang Liu (TDLI,. SJTU)

30/09/2024, 13:20

Sci. China-Phys. Mech. Astron., 66(1): 211062 (2023)
arXiv:2310.13926
arXiv:2401.15477
arXiv:2311.01780
arXiv:2407.17800
arXiv:2407.20723
DOI:10.5281/zenodo.8373963
DOI:10.1016/j.nuclphysbps.2024.06.019
DOI:10.1016/j.nuclphysbps.2024.07.008
DOI:10.1016/j.nuclphysbps.2024.06.014

Dark SHINE is a fixed-target experiment initiative to search for light Dark Matter and mediators at SHINE...

7. Exploring Dark Matter Microphysics Through Neutron Star Collapse

Arvind Kumar Mishra (Nanjing Normal University, China)

30/09/2024, 13:40

Neutron stars (NS) situated in dark matter (DM)-rich environments can capture DM particles. The captured DM particles can thermalize, form a gravitationally bound core, and eventually form a black hole inside the NS. After accreting the surrounding material, the black hole can destroy the NS. In light of this, we constrain DM microphysics from the survival of the neutron star. In this talk, we...

39. Bubbles kick off primordial black holes to form more binaries

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

30/09/2024, 14:00

Primordial black holes (PBHs) may form before cosmological first-order phase transitions, leading to inevitable collisions between PBHs and bubble walls. In this Letter, we have simulated for the first time the co-evolution of an expanding scalar wall passing through a black hole with full numerical relativity. This black hole-bubble wall collision yields multiple far-reaching phenomena...