Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Depta, Paul Frederik"'
Pulsar Timing Array (PTA) observations have recently gathered substantial evidence for the existence of a gravitational wave background in the nHz frequency band. Searching for anisotropies in this signal is key to determining its origin, and in part
Externí odkaz:
http://arxiv.org/abs/2407.14460
In this letter we evaluate whether the gravitational wave background recently observed by a number of different pulsar timing arrays could be due to merging primordial supermassive black hole binaries. We find that for homogeneously distributed primo
Externí odkaz:
http://arxiv.org/abs/2306.17836
Autor:
Bringmann, Torsten, Depta, Paul Frederik, Konstandin, Thomas, Schmidt-Hoberg, Kai, Tasillo, Carlo
Gravitational waves from a first-order cosmological phase transition, at temperatures at the MeV-scale, would arguably be the most exciting explanation of the common red spectrum reported by the NANOGrav collaboration, not the least because this woul
Externí odkaz:
http://arxiv.org/abs/2306.09411
Autor:
Bringmann, Torsten, Depta, Paul Frederik, Hufnagel, Marco, Kersten, Jörn, Ruderman, Joshua T., Schmidt-Hoberg, Kai
Publikováno v:
Phys.Rev.D 107 (2023) 7, L071702
We propose a novel mechanism to generate sterile neutrinos $\nu_s$ in the early Universe, by converting ordinary neutrinos $\nu_\alpha$ in scattering processes $\nu_s\nu_\alpha\to\nu_s\nu_s$. After initial production by oscillations, this leads to an
Externí odkaz:
http://arxiv.org/abs/2206.10630
Autor:
Bringmann, Torsten, Depta, Paul Frederik, Hufnagel, Marco, Ruderman, Joshua T., Schmidt-Hoberg, Kai
Publikováno v:
Phys.Rev.Lett. 127 (2021) 19, 191802
We propose a novel mechanism for the production of dark matter (DM) from a thermal bath, based on the idea that DM particles $\chi$ can transform heat bath particles $\psi$: $\chi \psi \rightarrow \chi \chi$. For a small initial abundance of $\chi$ t
Externí odkaz:
http://arxiv.org/abs/2103.16572
The remarkable agreement between observations of the primordial light element abundances and the corresponding theoretical predictions within the standard cosmological history provides a powerful method to constrain physics beyond the standard model
Externí odkaz:
http://arxiv.org/abs/2011.06518
Publikováno v:
JCAP 04, 011 (2021)
In this work, we revise and update model-independent constraints from Big Bang Nucleosynthesis on MeV-scale particles $\phi$ which decay into photons and/or electron-positron pairs. We use the latest determinations of primordial abundances and extend
Externí odkaz:
http://arxiv.org/abs/2011.06519
Publikováno v:
Phys. Lett. B 817, 136341 (2021)
Dark matter (DM) as a thermal relic of the primordial plasma is increasingly pressured by direct and indirect searches, while the same production mechanism in a decoupled sector is much less constrained. We extend the standard treatment of the freeze
Externí odkaz:
http://arxiv.org/abs/2007.03696
Publikováno v:
JHEP 09 (2020) 036
Thermal leptogenesis, in the framework of the standard model with three additional heavy Majorana neutrinos, provides an attractive scenario to explain the observed baryon asymmetry in the universe. It is based on the out-of-equilibrium decay of Majo
Externí odkaz:
http://arxiv.org/abs/2005.01728
Axion-like particles with masses in the keV-GeV range have a profound impact on the cosmological evolution of our Universe, in particular on the abundance of light elements produced during Big Bang Nucleosynthesis. The resulting limits are complement
Externí odkaz:
http://arxiv.org/abs/2002.08370