Zobrazeno 1 - 10
of 280
pro vyhledávání: '"R. Gangopadhyay"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 9, Pp 1-41 (2024)
Abstract We examine the possibility of Primordial Black Holes (PBHs) formation in single field models of inflation. Using the adiabatic or wave function renormalization scheme in the short range modes, we show that one-loop correction to the power sp
Externí odkaz:
https://doaj.org/article/9078daaec8644f308f4e725436aa9413
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 9, Pp 1-10 (2022)
Abstract In a class of single field models of inflation, the idea of primordial black holes (PBHs) production is studied. In this case, the dynamics on small cosmological scales differs significantly from that of the large scales probed by the observ
Externí odkaz:
https://doaj.org/article/664c271c9a6d404681ffe22aace26b3a
Publikováno v:
Physics Letters B, Vol 835, Iss , Pp 137510- (2022)
We report on a study of the natural warm inflationary paradigm (WNI). We show two important new results arise in this model. One is that the observational constraints on the primordial power spectrum from the cosmic microwave background (CMB) can be
Externí odkaz:
https://doaj.org/article/f1c47963a6a4404fbd068931e8ec0942
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 9, Pp 1-11 (2020)
Abstract In the recent time, inflationary cosmology is facing an existential crisis due to the proposed Swampland criterion which aims to evade any (meta-)stable de Sitter construction within the String landscape. It is been realised that a single fi
Externí odkaz:
https://doaj.org/article/b25c15b86e5843d6a38df655c892f8a3
Publikováno v:
Universe, Vol 9, Iss 2, p 83 (2023)
We consider a scenario of large-scale modification of gravity that does not invoke extra degrees of freedom, but includes coupling between baryonic matter and dark matter in the Einstein frame. The total matter energy density follows the standard con
Externí odkaz:
https://doaj.org/article/d86a798d74ea44f4833c4b342dd1ebd2
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 9, Pp 1-10 (2018)
Abstract We explore the possibility that both the suppression of the $$\ell = 2$$ ℓ=2 multipole moment of the power spectrum of cosmic microwave background temperature fluctuations and the possible dip for $$\ell = 10$$ ℓ=10 –30 can be explaine
Externí odkaz:
https://doaj.org/article/8111a5f9be244e66bada35e57cf61cf5
Akademický článek
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Publikováno v:
Physics of the Dark Universe. 40:101177
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8af87d13666633e27cf52bc08e30f226
https://doi.org/10.1016/j.dark.2023.101177
https://doi.org/10.1016/j.dark.2023.101177
We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a72f44932ebbbb3224befb45c0183882
http://arxiv.org/abs/2106.03093
http://arxiv.org/abs/2106.03093
Autor:
Koushik Dutta, Anshuman Maharana, Sukannya Bhattacharya, Ratul Mahanta, Mayukh R. Gangopadhyay, Subinoy Das
Publikováno v:
Physical Review D. 103
Decay of the inflaton or moduli which dominated the energy density of the universe at early times leads to a matter to radiation transition epoch. We consider nonthermal sterile dark matter (DM) particles produced as decay product during such transit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::747dc880bd52beca79a56673afc7949f
https://doi.org/10.1103/physrevd.103.063503
https://doi.org/10.1103/physrevd.103.063503