13 citations · 35 across the 8 of their papers we have counts for
7 papers · 1 filter
Exploring Beyond ΛCDM with the Weak Lensing Power Spectrum and Bispectrum
Liantsoa F. Randrianjanahary, Chandrachud B. V. Dash
In this work, we present Fisher matrix forecast of the tomographic weak lensing power spectrum and bispectrum for three physically distinct types of models of beyond-CDM: the CP…
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 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…