Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Pal, Supratik"'
In the standard cosmological framework, neutrinos begin to free-stream after the weak interaction phase ends in the early universe, at a temperature of approximately $T \sim 1 \, {\rm MeV}$. However, the onset of neutrino free-streaming can be delaye
Externí odkaz:
http://arxiv.org/abs/2409.03712
Reionization is one of the least understood processes in the evolution history of the Universe, mostly because of the numerous astrophysical processes occurring simultaneously about which we do not have a very clear idea so far. In this article, we u
Externí odkaz:
http://arxiv.org/abs/2407.19481
Primordial magnetic fields (PMFs) may significantly influence 21-cm physics via two mechanisms: (i) magnetic heating of the intergalactic medium (IGM) through ambipolar diffusion (AD) and decaying magnetohydrodynamic turbulence (DT), (ii) impact on t
Externí odkaz:
http://arxiv.org/abs/2407.11923
We propose novel inflationary primordial gravitational wave (GW) spectral shapes at interferometer-based current and future GW missions to test dark matter (DM) production and baryogenesis via gravity-portal. We consider three right-handed neutrinos
Externí odkaz:
http://arxiv.org/abs/2405.06741
We do a careful investigation of the prospects of dark energy (DE) interacting with cold dark matter (CDM) in alleviating the $S_8$ clustering tension. To this end, we consider various well-known parametrizations of the DE equation of state (EoS), an
Externí odkaz:
http://arxiv.org/abs/2404.06396
We investigate production of non-thermal dark matter particles and heavy sterile neutrinos from inflaton during the reheating era, which is preceded by a slow-roll inflationary epoch with a quartic potential and non-minimal coupling ($\xi$) between i
Externí odkaz:
http://arxiv.org/abs/2401.17262
Publikováno v:
Astrophys. J. Suppl. Ser. 273(2), 27 (2024)
We investigate the prospect of reconstructing the ''cosmic distance ladder'' of the Universe using a novel deep learning framework called LADDER - Learning Algorithm for Deep Distance Estimation and Reconstruction. LADDER is trained on the apparent m
Externí odkaz:
http://arxiv.org/abs/2401.17029
Autor:
Bhaumik, Arko, Pal, Supratik
Publikováno v:
Phys. Rev. D 110 (2024) 043511
Assuming a slow-roll inflationary model where conformal invariance of the Maxwell action is broken via a non-minimal kinetic coupling term, we investigate the non-Gaussian three-point cross-correlation function between the primordial curvature pertur
Externí odkaz:
http://arxiv.org/abs/2310.10342
While the $\mathbb{Z}_3$ symmetric dark matter models have shown tremendous prospects in addressing a number of (astro-)particle physics problems, they can leave interesting imprints on cosmological observations as well. We consider two such promisin
Externí odkaz:
http://arxiv.org/abs/2308.04955
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 527, Issue 1, January 2024, Pages 790-802
We explore possible signatures of the interaction between dark matter (DM) and massive neutrinos during the post-reionization epoch. Using both Fisher matrix forecast analysis and Markov Chain Monte-Carlo (MCMC) simulation, we conduct a thorough inve
Externí odkaz:
http://arxiv.org/abs/2307.00606