Dark Interactions: new perspectives for theory and experiment

Session

Session II

16 Nov 2022, 13:50

Online

Conveners

Session II

• Yu-Dai Tsai (University of California, Irvine)

41. Pulsar Timing Arrays: The Next Window to Open on the Gravitational-Wave Universe

Chiara Mingarelli (University of Connecticut)

16/11/2022, 13:50

Galaxy mergers are a standard aspect of galaxy formation and evolution, and most (likely all) large galaxies contain supermassive black holes. As part of the merging process, the supermassive black holes should in-spiral together and eventually merge, generating a background of gravitational radiation in the nanohertz to microhertz regime. An array of precisely timed pulsars spread across the...

9. Opening up window of post-inflationary QCD axion

LINGFENG LI (Brown U.)

16/11/2022, 14:20

The QCD axion cosmology depends crucially on whether the QCD axion is present during inflation or not. We point out that contrary to the standard criterion, the Peccei-Quinn (PQ) symmetry could remain unbroken during inflation, even when the axion decay constant, $f_a$, is (much) above the inflationary Hubble scale, $H_I$. This is achieved through the heavy-lifting of the PQ scalar field due...

26. Massive Neutrinos, Light Relics, and Ultra-Light Axions in the Halo Bias

Nicholas DePorzio

16/11/2022, 14:35

Cosmological data provide a powerful tool in the search for physics beyond the Standard Model (SM). Light but massive relics (LiMRs) which decoupled from the SM while relativistic contribute to the radiation energy budget, and are commonly searched through variations in the effective number $N_{\rm eff}$ of neutrino species. In addition to this effect, LiMRs with masses on the eV scale (meV-10...