The Mitchell Conference on Collider, Dark Matter, and Neutrino Physics 2023

Session

Astrophysics

May 18, 2023, 2:05 PM

Hawking Auditorium (Texas A&M University)

Conveners

Astrophysics

• William Shepherd

41. Ringdown beyond Kerr

Aaron Zimmerman

5/18/23, 2:05 PM

The final phase of gravitational radiation from black hole binaries is the ringdown of the merged black holes, which occurs at a characteristic set of frequencies. Measurements of the ringdown spectrum can provide especially clean tests of the nature of the final black hole, potentially revealing violations of the famous ``no-hair'' theorem. The large number of gravitational wave observations...

18. First Constraints on ALP-photon Couplings from Multimessenger Studies of the Neutron Star Merger GW170817

Kuver Sinha (University of Oklahoma)

5/18/23, 2:30 PM

We use multimessenger observations of the neutron star merger event GW170817 to derive the first merger constraints on axion-like particles (ALPs) coupling to photons. ALP production from Primakoff and photon coalescence processes is calculated; then, the region of parameter space where ALPs can escape the remnant and decay back into two photons is considered. This gives rise to an ALP-induced...

25. Gravitational Wave Signatures of Reheating

Jae Hyeok Chang (JHU/UMD)

5/18/23, 2:55 PM

We initiate a study of the gravitational wave signatures of a phase transition that occurs as the Universe's temperature increases during reheating. The gravitational wave signatures of a heating phase transition are different from those of a cooling phase transition and observation of them would allow us to probe reheating. In the lucky case that the gravitational wave signatures from both...

47. ΛCDM tensions and new physics

Savvas Koushiappas, Savvas Koushiappas (Brown University)

5/18/23, 3:20 PM

In the last few years increased precision of experimental data led to challenges to ΛCDM. The dynamics of the expansion and the statistics of the growth of structure appear to be in tension between local measurements and inference from the CMB. I will discuss the H0 and S8 tensions and discuss new physics solutions in the context of dark matter/energy and quantum gravity.