52 citations · 269 across the 23 of their papers we have counts for
23 papers
Simulation-Based Priors for HI Bias from Halo Occupation Physics
Debanjan Sarkar, Simon Foreman
Full-shape analyses of 21 cm intensity maps with the effective field theory of large-scale structure will require priors on HI bias parameters, and the standard choice of broad uni…
Cosmology with Multi-Wavelength Line Intensity Mapping Synergies in the SKAO Era
Debanjan Sarkar, Suman Majumdar, Chandra Shekhar Murmu +21
Line intensity mapping (LIM) has emerged as a powerful tool for surveying the large-scale structure of the Universe across cosmic time by measuring spatial fluctuations in the cumu…
Cosmology with Intensity Mapping via Statistics Beyond the Power Spectrum in the SKAO Era
Suman Majumdar, Debanjan Sarkar, Leon Noble +38
The cosmological distribution of neutral hydrogen (HI) during the post-reionization era is highly non-Gaussian due to the underlying non-linear structure formation, complex galaxy…
Probing Reionization up to the Mark: The Marked Power Spectrum to unveil the HI 21-cm signal from the EoR
Vishrut Pandya, Leon Noble, Suman Majumdar +3
The redshifted 21-cm signal from neutral hydrogen (HI) in the intergalactic medium (IGM) is a powerful probe of the Epoch of Reionization (EoR). Owing to the complex growth and mor…
Redshift-space 21-cm bispectrum multipoles as an SKA-era gravity test in the post-reionization Universe
Sourav Pal, Debanjan Sarkar
The redshifted 21-cm line from neutral hydrogen ($\textrm{H}\textsc{i}$) enables volumetric intensity mapping of large-scale structure in the post-reionization Universe. In anticip…
Tracing Signatures of Modified Gravity in Redshift-Space Galaxy Bispectrum Multipoles: Prospects for Euclid
Sourav Pal, Debanjan Sarkar, Alejandro Aviles
We study the galaxy bispectrum multipoles in the Hu-Sawicki gravity model, where a scalar degree of freedom mediates a fifth force that is screened in high-density environme…
Redshift-space galaxy bispectrum in presence of massive neutrinos: A multipole expansion approach for Euclid
Sourav Pal, Debanjan Sarkar, Rickmoy Samanta +1
Massive neutrinos imprint distinctive signatures on the evolution of cosmic structures, notably suppressing small-scale clustering. We investigate the impact of massive neutrinos o…
The re-markable 21-cm power spectrum I: Probing the HI distribution in the post-reionization era using marked statistics
Mohd Kamran, Martin Sahlén, Debanjan Sarkar +1
The neutral hydrogen (HI) power spectrum, measured from intensity fluctuations in the 21-cm background, offers insights into the large-scale structures (LSS) of our Universe in the…
The size and shape dependence of the SDSS galaxy bispectrum
Anindita Nandi, Sukhdeep Singh Gill, Debanjan Sarkar +3
We have measured the spherically averaged bispectrum of the SDSS main galaxy sample, considering a volume-limited data cube with mean galaxy number density $…
HERA bound on x-ray luminosity when accounting for population III stars
Hovav Lazare, Debanjan Sarkar, Ely D. Kovetz
Recent upper bounds from the Hydrogen Epoch of Reionization Array (HERA) on the cosmological 21-cm power spectrum at redshifts , have been used to constrain $L_{\r…
Mitigating the optical depth degeneracy in the cosmological measurement of neutrino masses using 21-cm observations
Gali Shmueli, Debanjan Sarkar, Ely D. Kovetz
Massive neutrinos modify the expansion history of the universe and suppress the structure formation below their free streaming scale. Cosmic microwave background (CMB) observations…
Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
Debanjan Sarkar, Ely D. Kovetz
The fluctuations in the dark matter-baryon relative velocity field are imprinted as acoustic oscillations in the 21-cm power spectrum during cosmic dawn (CD). These velocity acoust…
Quantifying the redshift space distortion of the bispectrum III : Detection prospects of the multipole moments
Arindam Mazumdar, Debanjan Sarkar, Somnath Bharadwaj
The redshift space anisotropy of the bispectrum is generally quantified using multipole moments. The possibility of measuring these multipoles in any survey depends on the level of…
Unveiling cosmological information on small scales with line intensity mapping
Sarah Libanore, Caner Unal, Debanjan Sarkar +1
One of the toughest challenges in modern cosmology is to probe the small scales Mpc in the matter power spectrum and clustering. We show that such small scales…
Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter
Debanjan Sarkar, Jordan Flitter, Ely D. Kovetz
In the fuzzy dark matter (FDM) model, dark matter is composed of ultra-light particles with a de Broglie wavelength of kpc, above which it behaves like cold dark matter (CDM)…
A fast estimator for quantifying the shape dependence of the 3D bispectrum
Abinash Kumar Shaw, Somnath Bharadwaj, Debanjan Sarkar +3
The dependence of the bispectrum on the size and shape of the triangle contains a wealth of cosmological information. Here we consider a triangle parameterization which allows us t…
First multi-redshift limits on post-Epoch of Reionization (post-EoR) 21 cm signal from z = 1.96 - 3.58 using uGMRT
Arnab Chakraborty, Abhirup Datta, Nirupam Roy +8
Measurement of fluctuations in diffuse HI 21 cm background radiation from the post-reionization epoch (z < 6) is a promising avenue to probe the large-scale structure of the Univer…
Quantifying the Redshift Space Distortion of the Bispectrum II: Induced Non-Gaussianity at Second Order Perturbation
Arindam Mazumdar, Somnath Bharadwaj, Debanjan Sarkar
The anisotrpy of the redshift space bispectrum , which contains a wealth of cosmological information, is completely quantified using mu…
Quantifying the Redshift Space Distortion of the Bispectrum I: Primordial Non-Gaussianity
Somnath Bharadwaj, Arindam Mazumdar, Debanjan Sarkar
The anisotropy of the redshift space bispectrum contains a wealth of cosmological information. This anisotropy depends on the orientation of three vectors with…
Modelling the post-reionization neutral hydrogen () 21-cm bispectrum
Debanjan Sarkar, Suman Majumdar, Somnath Bharadwaj
Measurements of the post-reionization 21-cm bispectrum using various upcoming intensity mapping experiments hold the potential…
Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
Debanjan Sarkar, Somnath Bharadwaj
The {\rm HI} 21-cm intensity mapping signal experiences redshift space distortions due to the motion of the galaxies which contain the {\rm HI} as well as the motions of the {\rm H…
Modelling redshift-space distortion in the post-reionization 21-cm power spectrum
Debanjan Sarkar, Somnath Bharadwaj
The post-reionization 21-cm signal is an excellent candidate for precision cosmology, this however requires accurate modelling of the expected signal. Sarkar et al. (201…
Modelling the post-reionization neutral Hydrogen (\HI) bias
Debanjan Sarkar, Somnath Bharadwaj, Anathpindika S.
Observations of the neutral Hydrogen (\HI ) 21-cm signal hold the potential of allowing us to map out the cosmological large scale structures (LSS) across the entire post-reionizat…