142 citations · 903 across the 31 of their papers we have counts for
14 papers · 1 filter
Ruling out Strongly Interacting Dark Matter-Dark Radiation Models from Joint Observations of Cosmic Microwave Background and Quasar Absorption Spectra
Atrideb Chatterjee, Sourav Mitra, Amrita Banerjee
The cold dark matter (CDM) paradigm provides a remarkably good description of the Universe's large-scale structure. However, some discrepancies exist between its predictions and ob…
Non-parametric Reconstruction of Photon Escape Fraction from Reionization
Sourav Mitra, Atrideb Chatterjee
One of the most crucial yet poorly constrained parameters in modelling the ionizing emissivity is the escape fraction of photons from star-forming galaxies. Several theoretical and…
CosmoReionMC: A package for estimating cosmological and astrophysical parameters using CMB, Lyman-α absorption and global 21 cm data
Atrideb Chatterjee, Tirthankar Roy Choudhury, Sourav Mitra
We present a Markov Chain Monte Carlo (MCMC)-based parameter estimation package, CosmoReionMC, to jointly constrain cosmological parameters of the CDM model and the astrophysica…
First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
Sourav Mitra, Chan-Gyung Park, Tirthankar Roy Choudhury +1
We examine the effects of dark energy dynamics and spatial curvature on cosmic reionization by studying reionization in tilted spatially-flat and untilted non-flat XCDM and CDM…
First study of reionization in the Planck 2015 normalized closed CDM inflation model
Sourav Mitra, Tirthankar Roy Choudhury, Bharat Ratra
We study reionization in two non-flat CDM inflation models that best fit the Planck 2015 cosmic microwave background anisotropy observations, ignoring or in conjunction with bar…
Constraining the contribution of active galactic nuclei to reionisation
Sultan Hassan, Romeel Davé, Sourav Mitra +3
Recent results have suggested that active galactic nuclei (AGN) could provide enough photons to reionise the Universe. We assess the viability of this scenario using a semi-numeric…
Cosmic reionization after Planck II: contribution from quasars
Sourav Mitra, T. Roy Choudhury, Andrea Ferrara
In the light of the recent Planck downward revision of the electron scattering optical depth, and of the discovery of a faint AGN population at , we reassess the actual cont…
Cosmic reionization after Planck
Sourav Mitra, T. Roy Choudhury, Andrea Ferrara
Cosmic reionization holds the key to understand structure formation in the Universe, and can inform us about the properties of the first sources, as their star formation efficiency…
The escape fraction of ionizing photons from high redshift galaxies from data-constrained reionization models
Sourav Mitra, Andrea Ferrara, T. Roy Choudhury
The escape fraction, f_{esc}, of ionizing photons from high-redshift galaxies is a key parameter to understand cosmic reionization and star formation history. Yet, in spite of many…
Data-constrained reionization and its effects on cosmological parameters
Stefania Pandolfi, Andrea Ferrara, T. Roy Choudhury +2
We perform an analysis of the recent WMAP7 data considering physically motivated and viable reionization scenarios with the aim of assessing their effects on cosmological parameter…
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…
Joint QSO-CMB constraints on reionization history
Sourav Mitra, T. Roy Choudhury, Andrea Ferrara
Based on the work by Mitra, Choudhury & Ferrara (2010), we obtain model-independent constraints on reionization from cosmic microwave background (CMB) and QSO absorption line data…
Formation rates of Dark Matter Haloes
Sourav Mitra, Girish Kulkarni, J. S. Bagla +1
We derive an estimate of the rate of formation of dark matter halos per unit volume as a function of the halo mass and redshift of formation. Analytical estimates of the number den…
Reionization constraints using Principal Component Analysis
Sourav Mitra, T. Roy Choudhury, Andrea Ferrara
Using a semi-analytical model developed by Choudhury & Ferrara (2005) we study the observational constraints on reionization via a principal component analysis (PCA). Assuming that…