Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Mukhopadhyay, Upala"'
Publikováno v:
JCAP 2407 (2024) 072
Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts $z \gtrsim 5$: these observations are in tension with the predictions not only of
Externí odkaz:
http://arxiv.org/abs/2401.12659
Publikováno v:
JCAP 2310 (2023) 072
Early data from the James Webb Space Telescope (JWST) has uncovered the existence of a surprisingly abundant population of very massive galaxies at extremely high redshift, which are hard to accommodate within the standard $\Lambda$CDM cosmology. We
Externí odkaz:
http://arxiv.org/abs/2307.12763
Publikováno v:
JCAP 10, 099 (2022)
The evaporation of Primordial Black Hole (PBH) via Hawking radiation influences the evolution of Inter Galactic Medium by heating up the latter and consequently affects the 21cm signal originated from the neutral Hydrogen atoms. In this work, we have
Externí odkaz:
http://arxiv.org/abs/2203.13008
The evaporations of Primordial Black Holes (PBH) (via Hawking radiation) can produce electrons/positrons ($e^-/e^+$) in the Galactic Centre (GC) region which under the influence of the magnetic field of Centre region can emit synchrotron radiation. T
Externí odkaz:
http://arxiv.org/abs/2109.14955
We consider a simple extension of Standard Model by adding two complex singlet scalars with a $\rm{U}\left(1\right)$ symmetry. A discrete $\mathcal{Z}_2 \times \mathcal{Z}^{\prime}_2$ symmetry is imposed in the model and the added scalars acquire a n
Externí odkaz:
http://arxiv.org/abs/2010.03439
Publikováno v:
Phys. Rev. D 103, 063510 (2021)
The EDGES experiment has observed an excess trough ($-500^{+200}_{-500}$ mK) in the brightness temperature $T_{21}$ of the 21cm absorption line of neutral Hydrogen atom (HI) from the era of cosmic dawn ($z \simeq 17.2$). We consider possible interact
Externí odkaz:
http://arxiv.org/abs/2008.09972
We consider a dark energy scenario driven by a scalar field $\phi$ with a pseudo Nambu Goldstone boson (pNGB) type potential $V(\phi)=\mu^4 \left( 1+ {\rm cos}(\phi/f) \right)$. The pNGB originates out of breaking of spontaneous symmetry at a scale $
Externí odkaz:
http://arxiv.org/abs/1909.03925
Publikováno v:
Phys. Rev. D 100, 024006 (2019)
We explore in this work whether Slotheon model of Dark Energy obeys the Swampland criteria of string theory. Since de Sitter vacuum is very difficult to construct in string theory the cosmological constant as an explanation of Dark Energy is almost r
Externí odkaz:
http://arxiv.org/abs/1904.01455
Within the framework of modified gravity model namely Slotheon model, inspired by the theory of extra dimensions, we explore the behaviour of Dark Energy and the perturbations thereof. The Dark Energy and matter perturbations equations are then deriv
Externí odkaz:
http://arxiv.org/abs/1903.08650
Autor:
Mukhopadhyay, Upala1 (AUTHOR), Paul, Avik1 (AUTHOR) avik.paul@saha.ac.in, Majumdar, Debasish1 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Oct2020, Vol. 80 Issue 10, p1-27. 27p.
