28 citations · 137 across the 14 of their papers we have counts for
14 papers
Science of High Resolution X-ray Imaging
H. L. Marshall, K. Weaver, M. Schattenburg +34
This report summarizes potential studies of the Hi-ReX Science Analysis Group for an Ultra-High Angular Resolution X-ray Observatory. Many potential science cases are presented, sp…
Constraining the parameters of an isolated neutron star using the lensed HI signal at uGMRT
Rupa Basu, Siddhartha Bhattacharyya, Anjan Kumar Sarkar +2
The strength of the HI signal originating from a distant galaxy at a cosmological distance is several orders of magnitude lower than the foreground and background noise and hence i…
Thermal Evolution of the IGM due to Lyman-α photons during the Cosmic Dawn
Janakee Raste, Anjan Kumar Sarkar, Shiv K. Sethi
The first star-forming objects which formed at high redshifts during the cosmic dawn (CD) also emitted photons between Lyman- and Lyman-limit frequencies. These photons are inst…
Constraining ultra slow roll inflation using cosmological datasets
H. V. Ragavendra, Anjan Kumar Sarkar, Shiv K. Sethi
In recent years, the detection of gravitational waves by LIGO and PTA collaborations have raised the intriguing possibility of excess matter power at small scales. Such an increase…
Weighing neutrinos with Lyman- observations
Anjan K. Sarkar, Shiv K. Sethi
The presence of massive neutrinos has still not been revealed by the cosmological data. We consider a novel method based on the two-point line-of-sight correlation function of high…
Probing early universe through redshifted 21-cm signal: Modelling and observational challenges
Abinash Kumar Shaw, Arnab Chakraborty, Mohd Kamran +8
The redshifted 21-cm radiation from the atomic hydrogen (HI) provides an excellent direct probe to study the evolution of HI in IGM and thus reveal the nature of the first luminous…
Using the redshift evolution of the Lyman- effective opacity as a probe of dark matter models
Anjan Kumar Sarkar, Kanhaiya L. Pandey, Shiv K. Sethi
Lyman- forest data are known to be a good probe of the small scale matter power. In this paper, we explore the redshift evolution of the observable effective optical depth $τ_{\…
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 $…
Predictions for measuring the 21-cm multi-frequency angular power spectrum using SKA-Low
Rajesh Mondal, Abinash Kumar Shaw, Ilian T. Iliev +5
The light-cone (LC) effect causes the mean as well as the statistical properties of the redshifted 21-cm signal to change with frequency (or cosmic t…
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…
A method to determine the evolution history of the mean neutral Hydrogen fraction
Rajesh Mondal, Somnath Bharadwaj, Ilian T. Iliev +4
The light-cone (LC) effect imprints the cosmological evolution of the redshifted 21-cm signal along the frequency axis which is the line of sight (L…
An analytical method to simulate the HI 21-cm visibility signal for intensity mapping experiments
Anjan Kumar Sarkar, Somnath Bharadwaj, Visweshwar Ram Marthi
Simulations play a vital role in testing and validating HI 21-cm power spectrum estimation techniques. Conventional methods use techniques like N-body simulations to simulate the s…
Fisher Matrix Based Predictions for Measuring the z = 3.35 Binned 21-cm Power Spectrum using the Ooty Wide Field Array (OWFA)
Anjan Kumar Sarkar, Somnath Bharadwaj, Sk. Saiyad Ali
We use the Fisher matrix formalism to predict the prospects of measuring the redshifted 21-cm power spectrum in different -bins using observations with the upcoming Ooty Wide Fi…
Fisher matrix predictions for detecting the cosmological 21 cm signal with the Ooty Wide Field Array (OWFA)
Somnath Bharadwaj, Anjan Kumar Sarkar, Sk. Saiyad Ali
We have used the Fisher matrix formalism to quantify the prospects of detecting the z = 3.35 redshifted 21-cm HI power spectrum with the upcoming radio-imterferometric array OWFA.…