Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Ghosh, Deep"'
Autor:
Ghosh, Avirup, Ghosh, Deep
Among the very few available probes of the post-inflationary reheating epoch one is the spectrum of inflationary tensor perturbations which is affected by the Universe's equation of state during the reheating era. Contrary to the usual approach of as
Externí odkaz:
http://arxiv.org/abs/2411.02052
There is a significant uncertainty in the prediction of atmospheric muon neutrino and anti-neutrino flux ratio using different flux models, especially at higher energies. We study the prospects of experimentally measuring this flux ratio as a functio
Externí odkaz:
http://arxiv.org/abs/2409.20231
It is conceivable that a bosonic dark matter (DM) with non-gravitational interactions with SM particles will be accumulated at the center of a neutron star (NS) and can lead to black hole formation. In contrast to previous works with a fixed NS tempe
Externí odkaz:
http://arxiv.org/abs/2408.16091
Publikováno v:
Physical Review D 109, 083541 (2024)
The initial density of dark matter (DM) particles, otherwise secluded from the standard model (SM), may be generated at reheating, with an initial temperature ratio for internal thermalizations, $\xi_i=T_{\rm DM,i}/T_{\rm SM,i}$. This scenario necess
Externí odkaz:
http://arxiv.org/abs/2312.12985
Autor:
Ghosh, Deep
In dark matter (DM) cosmology, the central question is how the present-day density of DM is generated from some initial conditions in the early universe. Different production mechanisms of DM are instrumental in probing DM microphysics in current and
Externí odkaz:
http://arxiv.org/abs/2306.13607
Autor:
Ghosh, Deep
Publikováno v:
Eur. Phys. J. C 84, 623 (2024)
In big bang nucleosynthesis (BBN), the light matter abundance is dictated by the neutron-to-proton ($n/p$) ratio which is controlled by the standard weak processes in the early universe. Here, we study the effect of an extra particle species ($\chi$)
Externí odkaz:
http://arxiv.org/abs/2207.10499
Publikováno v:
Phys.Rev.D 104 (2021) 12, 123543
The cosmology of a standard model (SM) gauge singlet complex scalar dark matter (DM), stabilized by a reflection symmetry, is studied including all renormalizable interactions that preserve the reflection symmetry but can break the larger global U(1)
Externí odkaz:
http://arxiv.org/abs/2103.14009
Publikováno v:
Eur. Phys. J. C (2021) 81:1038
We point out qualitatively different possibilities on the role of CP-conserving processes in generating cosmological particle-antiparticle asymmetries, with illustrative examples from models in leptogenesis and asymmetric dark matter production. In p
Externí odkaz:
http://arxiv.org/abs/2103.03650
Autor:
Ghosh, Deep1 (AUTHOR) matrideb1@gmail.com
Publikováno v:
European Physical Journal C -- Particles & Fields. Jun2024, Vol. 84 Issue 6, p1-13. 13p.
Publikováno v:
JHEP 08 (2020), 149
We show that a general semi-annihilation scenario, in which a pair of dark matter (DM) particles annihilate to an anti-DM, and an unstable state that can mix with or decay to standard model states, can lead to particle anti-particle asymmetry in the
Externí odkaz:
http://arxiv.org/abs/2004.07705