PASCOS 2023

Session

Not registered

Jun 30, 2023, 3:30 PM

1010 (ISEB)

65. Imprints of Ultra-light Axions in the Halo Bias

Dr Nicholas DePorzio (Harvard University)

Cosmology

Ultra-light axions with masses $10^{-33} < m_\phi/{\rm eV} < 10^{-22}$ are allowed to constitute only a small fraction of the observed dark matter abundance. Nevertheless, they may yet produce a visible impact on the cosmology due to their macroscopic quantum scale. Next generation galaxy survey data are poised to challenge this possibility, but in order to do so, all aspects of structure...

6. Primordial black holes and stochastic inflation beyond slow roll

Dr Swagat Saurav Mishra (University of Nottingham, UK)

Primordial Black Holes (PBHs) may form in the early universe, from the gravitational collapse of large density perturbations, generated by large quantum fluctuations during inflation. Since PBHs form from rare over-densities, their abundance is sensitive to the tail of the primordial probability distribution function (PDF) of the perturbations. It is therefore important to calculate the full...

44. Probing Left-Right Symmetry at Energies High and Low

Lukas Graf (University of California, Berkeley)

Restoration of left-right symmetry at high energy scales provides a well-motivated extension of the Standard Model, which has been scrutinized over the past few decades and that can be viewed as the intermediate step towards grand unification. In my talk, I will investigate whether these models can be probed via the search for a stochastic gravitational wave background induced by the...

11. QCD axion mass prediction from Adaptive Mesh Refinement simulations

Joshua Benabou (University of California, Berkeley / Lawrence Berkeley National Lab)

If the PQ symmetry is broken after inflation then the QCD axion mass that gives rise to the observed dark matter (DM) abundance can in principle be calculated precisely. In practice it remains a computational challenge to accurately predict the DM contribution from nonlinear features of the PQ field such as axion strings, which introduce a large hierarchy of scales between their width and the...

4. Quantum matter and Buchdahl's theorem.

Ignacio A. Reyes (University of Amsterdam)

Very compact stars seem to be forbidden in General Relativity. While Buchdahl's theorem sets an upper bound on compactness, further no-go results rely on the existence of two light rings, the inner of which is associated to gravitational instabilities. However, little is known about the role of QFT in these strong gravity regimes. We show that the renormalized stress tensor for CFTs diverges...