Publications (14)
Cosmology from Point Clouds with Dark Matter Halos from the Quijote Simulations
Atrideb Chatterjee, Francisco Villaescusa-Navarro
We train a novel deep learning architecture to perform likelihood-free inference on the value of the cosmological parameters from halo catalogs of the Quijote N-body simulations. O…
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…
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 astrophysic…
Exploring the BSM parameter space with Neural Network aided Simulation-Based Inference
Atrideb Chatterjee, Arghya Choudhury, Sourav Mitra +2
Some of the issues that make sampling parameter spaces of various beyond the Standard Model (BSM) scenarios computationally expensive are the high dimensionality of the input param…
Impact of Primordial Black Hole population on 21 cm observables at high redshift
Atrideb Chatterjee, Barun Maity, Koushiki
The 21-cm signal, one of the most promising probes of the high-redshift Universe, has traditionally been modelled without accounting for the effects of active galactic nuclei (AGN)…
A hint on the metal-free star formation rate density from 21cm-EDGES data
Atrideb Chatterjee, Pratika Dayal, Tirthankar Roy Choudhury +1
We aim to provide the first data-constrained estimate of the metal-free (Population III; Pop III) star formation rate density required at high-redshifts ($z \gtr…
Ruling out 3 keV warm dark matter using 21 cm-EDGES data
Atrideb Chatterjee, Pratika Dayal, Tirthankar Roy Choudhury +1
Weakly interacting cold dark matter (CDM) particles, which are otherwise extremely successful in explaining various cosmological observations, exhibit a number of problems on small…
Effect of Primordial Black Holes on the global 21-cm signal
Atrideb Chatterjee
The 21-cm global signal, a treasure trove of information about the nature of the first luminous sources of the Universe, has traditionally been modelled assuming that these early s…
Learning Cosmology from Nearest Neighbour Statistics
Atrideb Chatterjee, Arka Banerjee, Francisco Villaescusa-Navarro +1
Extracting cosmological parameters from galaxy/halo catalogues with sub-percent level accuracy is an important aspect of modern cosmology, especially in view of ongoing and upcomin…
Predictions of the 21cm global signal in the JWST and ALMA era
Atrideb Chatterjee, Pratika Dayal, Valentin Mauerhofer
We calculate the redshift evolution of the global 21cm signal in the first billion years using a semi-analytic galaxy formation model, DELPHI, that jointly tracks the assembly of d…
Using Artificial Neural Networks to extract the 21-cm Global Signal from the EDGES data
Madhurima Choudhury, Atrideb Chatterjee, Abhirup Datta +1
The redshifted 21-cm signal of neutral Hydrogen is a promising probe into the period of evolution of our Universe when the first stars were formed (Cosmic Dawn), to the period wher…
Warm Dark Matter constraints from the joint analysis of CMB, Lyman-, and global 21 cm data
Atrideb Chatterjee, Tirthankar Roy Choudhury
With the help of our previously built MCMC-based parameter estimation package \texttt{CosmoReionMC}, we investigate in detail the potential of 21 cm global signal, when combined wi…
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…
Studying Cosmic Dawn using redshifted HI 21-cm signal: A brief review
Ankita Bera, Raghunath Ghara, Atrideb Chatterjee +2
In this review article, we briefly outline our current understanding of the physics associated with the HI 21-cm signal from cosmic dawn. We discuss different phases of cosmic dawn…