Zobrazeno 1 - 10
of 97
pro vyhledávání: '"Sarkar, Tapomoy Guha"'
We propose an anisotropy quantifier of the HI 21-cm signal traditionally used to clock the astrophysics of the reionization era as a post-reionization dark energy diagnostic. We find that the anisotropy probe can be measured at SNR $\sim 10$ in both
Externí odkaz:
http://arxiv.org/abs/2405.03195
We consider a periodically driven system where the high-frequency driving protocol consists of a sequence of potentials switched on and off at different instants within a period. We explore the possibility of introducing an adiabatic modulation of th
Externí odkaz:
http://arxiv.org/abs/2404.06651
Detecting axionic dark matter (DM) could be possible in an X-ray spectrum from strongly magnetized neutron stars (NSs). We examine the possibility of axion-photon conversion in the magnetospheres of strongly magnetized NSs. In the current work, we in
Externí odkaz:
http://arxiv.org/abs/2403.15305
We attempt to find the impact of a modified Tolman Oppenheimer Volkoff (TOV) system of equations on the luminosities of direct photons, neutrinos and axions for a particular axion mass in the presence of a magnetic field. We employ two different equa
Externí odkaz:
http://arxiv.org/abs/2402.13044
In this study, we investigate a cosmological model involving a negative cosmological constant (AdS vacua in the dark energy sector). We consider a quintessence field on top of a negative cosmological constant and study its impact on cosmological evol
Externí odkaz:
http://arxiv.org/abs/2309.01623
Emission properties of compact astrophysical objects such as Neutron stars (NSs) are associated with crucial astronomical observables. In the current work, we obtain the mass, pressure profiles of the non-rotating NSs using the modified Tolman Oppenh
Externí odkaz:
http://arxiv.org/abs/2212.11652
Publikováno v:
Monthly Notices of Royal Astronomical Society, Volume 516, Issue 3, pg 4156-4163, 2022
In this work we investigate the possibility of constraining a thawing Quintessence scalar field model for dark energy. We propose using the imprint of baryon acoustic oscillation (BAO) on the cross-correlation of post-reionization 21-cm signal and ga
Externí odkaz:
http://arxiv.org/abs/2207.02562
We propose the intensity mapping of the redshifted HI 21-cm signal from the post-reionization epoch as a cosmological probe of $f(R)$ gravity. We consider the Hu-Sawicki class of $f(R)$ gravity models characterized by a single parameter $f_{,R0}$. Th
Externí odkaz:
http://arxiv.org/abs/2012.07373
Publikováno v:
Journal of Cosmology and Astroparticle Physics, Vol 2021, Number 02 (2021)
We investigate the prospects of detecting the cross correlation of CMBR weak-lensing convergence field with the large scale tracers of the underlying dark matter distribution in the post-reionization epoch. The cross-correlation is then used to make
Externí odkaz:
http://arxiv.org/abs/2010.05816
We have considered the prospects for measuring the cross Warm Dark Matter (WDM) power spectrum of the redshifted HI 21-cm signal and the Lyman-$\alpha$ forest and thereby constraining WDM mass using observations with upcoming radio-interferometers -
Externí odkaz:
http://arxiv.org/abs/1907.10309