42 citations · 236 across the 34 of their papers we have counts for
21 papers · 1 filter
Spherical Collapse and Halo Formation in a Cosmology with Decaying Dark Matter and a Semi-Cosmographic Dark Energy
Mohit Yadav, Tapomoy Guha Sarkar
We investigate nonlinear structure formation in a cosmological model combining one-body decaying dark matter (DDM) with a semi-cosmographic reconstruction of dark energy. In this s…
Padé semi-cosmographic reconstruction of residual dark energy in decaying dark matter cosmology: DESI DR2 BAO constraints and mock 21 cm forecasts
Mohit Yadav, Pankaj Chavan, Tapomoy Guha Sarkar
Pure cosmographic reconstructions provide a model-agnostic approach towards constraining cosmic evolution.We develop a hybrid phenomenological semi-cosmographic framework that adop…
Disentangling the growth rate of perturbations from the HI bias using only clustering data from galaxy surveys
Pankaj Chavan, Tapomoy Guha Sarkar, Anjan A Sen
This work serves two-fold purpose. Firstly, we provide an alternative to the traditional method of determining the growth rate of density perturbations . In usual practice, $…
A semi-cosmographic approach to study cosmological evolution in phase space
Pankaj Chavan, Tapomoy Guha Sarkar, Chandrachud B. V. Dash +1
The signature of Baryon Acoustic Oscillation in the clustering of dark-matter tracers allows us to measure independently. Treating these as conjugate variables, we…
Probing Decaying Dark Matter Using the Post-EoR HI 21-cm signal
Mohit Yadav, Tapomoy Guha Sarkar
We propose the HI 21-cm power spectrum from the post-reionization epoch as a probe of a cosmological model with decaying dark matter particles. The unstable particles are assumed t…
Probing dark energy using anisotropies in the clustering of post-EoR HI distribution
Chandrachud B. V. Dash, Tapomoy Guha Sarkar
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 fi…
Post-reionization HI 21-cm signal: A probe of negative cosmological constant
Chandrachud B. V. Dash, Tapomoy Guha Sarkar, Anjan A. Sen
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 ne…
Probing Quintessence using BAO imprint on the cross-correlation of weak lensing and post-reionization HI 21 cm signal
Chandrachud B. V. Dash, Tapomoy Guha Sarkar
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 (…
Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of gravity
Chandrachud B. V. Dash, Tapomoy Guha Sarkar, Anjan Kumar Sarkar
We propose the intensity mapping of the redshifted HI 21-cm signal from the post-reionization epoch as a cosmological probe of gravity. We consider the Hu-Sawicki class of $…
Constraining dark energy using the cross correlations of weak lensing with post-reionization probes of neutral hydrogen
Chandrachud B. V. Dash, Tapomoy Guha Sarkar
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 th…
Constraining warm dark matter power spectrum using the cross-correlation of HI 21 cm signal and the Lyman- forest
Anjan Kumar Sarkar, Ashis Kumar Pal, Tapomoy Guha Sarkar
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- forest and thereby constraining W…
Cosmology and Astrophysics Using the Post-reionization HI
Tapomoy Guha Sarkar, Anjan A Sen
We discuss the prospects of using the redshifted 21~cm emission from neutral hydrogen in the post-reionization epoch to study our universe. The main aim of the article is to highli…
The redshifted HI 21 cm signal from the post-reionization epoch: Cross-correlations with other cosmological probes
T. Guha Sarkar, K. K. Datta, A. K. Pal +2
Tomographic intensity mapping of the HI using the redshifted 21 cm observations opens up a new window towards our understanding of cosmological background evolution and structure f…
Prospects of probing quintessence with HI 21-cm intensity mapping survey
Azam Hussain, Shruti Thakur, Tapomoy Guha Sarkar +1
We investigate the prospect of constraining scalar field dark energy models using HI 21-cm intensity mapping surveys. We consider a wide class of coupled scalar field dark energy m…
Constraining Neutrino mass using the large scale HI distribution in the Post-reionization epoch
Ashis Kumar Pal, Tapomoy Guha Sarkar
The neutral intergalactic medium in the post reionization epoch allows us to study cosmological structure formation through the observation of the redshifted 21 cm signal and the L…
On using large scale correlation of the Ly- forest and redshifted 21-cm signal to probe HI distribution during the post reionization era
Tapomoy Guha Sarkar, Kanan K. Datta
We investigate the possibility of detecting the 3D cross correlation power spectrum of the Ly- forest and HI 21 cm signal from the post reionization epoch. The cross-correlation…
Predictions for BAO distance estimates from the cross-correlation of the Lyman-alpha forest and redshifted 21-cm emission
Tapomoy Guha Sarkar, Somnath Bharadwaj
We investigate the possibility of using the cross-correlation of the Lyman-alpha forest and redshifted 21-cm emission to detect the baryon acoustic oscillation (BAO). The standard…
The Imprint of the Baryon Acoustic Oscillations (BAO) in the Cross-correlation of the Redshifted HI 21-cm Signal and the Ly-alpha Forest
Tapomoy Guha Sarkar, Somnath Bharadwaj
The cross-correlation of the Ly-alpha forest and redshifted 21-cm emission has recently been proposed as an observational tool for mapping out the large-scale structures in the pos…
Constraining large scale HI bias using redshifted 21-cm signal from the post-reionization epoch
Tapomoy Guha Sarkar, Sourav Mitra, Suman Majumdar +1
In the absence of complex astrophysical processes that characterize the reionization era, the 21-cm emission from neutral hydrogen (HI) in the post-reionization epoch is believed t…
Cross-correlation of the HI 21-cm Signal and Lyman-alpha Forest: A Probe Of Cosmology
Tapomoy Guha Sarkar, Somnath Bharadwaj, Tirthankar Roy Choudhury +1
Separating the cosmological redshifted 21-cm signal from foregrounds is a major challenge. We present the cross-correlation of the redshifted 21-cm emission from neutral hydrogen (…
Gravitational Wave Detection Using Redshifted 21-cm Observations
Somnath Bharadwaj, Tapomoy Guha Sarkar
A gravitational wave traversing the line of sight to a distant source produces a frequency shift which contributes to redshift space distortion. As a consequence, gravitational wav…