Tootfinder

Gravitational Waves from Collapse of Pressureless Matter in the Early Universe
Ioannis Dalianis, Chris Kouvaris
https://arxiv.org/abs/2403.15126 https://…

Gravitational Waves from Collapse of Pressureless Matter in the Early Universe
If an early matter phase of the Universe existed after inflation with the proper power spectrum, enhanced density perturbations can decouple from the Hubble flow, turn around and collapse. In contrast to what happens in a radiation dominated Universe where pressure nullifies deviations from sphericity in these perturbations, in a matter dominated Universe, the lack of pressure although on the one hand facilitates the gravitational collapse, it allows small deviations from sphericity to grow sub…

Scalar Dark Matter and Stability of Higgs Vacuum within a Minimal SO(10) GUT Model
Nilavjyoti Hazarika, Paramita Deka, Kalpana Bora
https://arxiv.org/abs/2403.13529

Scalar Dark Matter and Stability of Higgs Vacuum within a Minimal SO(10) GUT Model
In this work, we delve to investigate a feasible range of dark matter (DM) masses within a non-supersymmetric $SO(10)$ Grand Unified Theory (GUT) scalar dark matter model, in freeze-out scenario. This model includes a singlet scalar denoted as S and an inert doublet represented by $ϕ$. Being part of SO(10), the quantum numbers of DM particles are assigned and hence we know their nature. These fields are odd under a discrete $Z_2$ matter parity $(-1)^{3(B-L)}$. The dark matter with mass 300 $\l…