186 citations · 1.7k across the 54 of their papers we have counts for
54 papers
Finding the distribution of matter using lenses - II: deconvolution-based reconstruction with 3x2pt measurements
Jun-Qian Jiang, Ajoy Dawn, Dhiraj Kumar Hazra +2
We present a deconvolution-based framework for testing scale-dependent departures of the late-time matter power spectrum from a fiducial cosmological model using pt measu…
Finding the distribution of matter using lenses - I: deconvolution-based reconstruction with CMB lensing
Ajoy Dawn, Jun-Qian Jiang, Dhiraj Kumar Hazra +2
The matter power spectrum is one of the primary statistical descriptors of the large-scale distribution of matter in the Universe and provides a powerful probe of cosmic structure…
The Primordial power spectrum from the largest to smallest CMB scales
Debabrata Chandra, Dhiraj Kumar Hazra, Arman Shafieloo +1
We reconstruct the primordial power spectrum (PPS) across the full range of cosmological scales accessible to Cosmic Microwave Background (CMB) observations. Using the Modified Ric…
Remembering George Smoot
John Berliner, Tom Broadhurst, Martin Bucher +31
George Smoot (1945-2025) was a major figure in observational cosmology, particularly through his role in the precision measurement of the CMB dipole and the discovery of the primor…
Reconstructing inflationary features on large scales using genetic algorithm
Alipriyo Hoory, Dhiraj Kumar Hazra, L. Sriramkumar
[Abridged] A variety of model-dependent as well as model-independent approaches suggest that certain localized features in the primordial scalar power spectrum can lead to a signif…
Non-Minimally Coupled Quintessence in Light of DESI
Samuel Sánchez López, Alexandros Karam, Dhiraj Kumar Hazra
We analyze a model of quintessence governed by an exponential potential and non-minimally coupled to gravity, in light of recent datasets, including cosmic microwave background, ba…
Primordial Features in light of the Effective Field Theory of Large Scale Structure
Rodrigo Calderon, Théo Simon, Arman Shafieloo +1
While the simplest inflationary models predict a power-law form of the primordial power spectrum (PPS), various UV complete scenarios predict features on top of the standard power…
Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
Catherine Petretti, Matteo Braglia, Xingang Chen +2
Several missions following Planck are currently under development, which will provide high-precision measurements of the Cosmic Microwave Background (CMB) anisotropies. Specificall…
Exploring the discrepancy between Planck PR3 and ACT DR4
Dhiraj Kumar Hazra, Benjamin Beringue, Josquin Errard +2
We explore the scales and the extent of disagreement between PR3 and Atacama Cosmology Telescope (ACT) DR4 data. and ACT data have substantial overlap in the temp…
The asymmetry of dawn: evidence for asymmetric reionization histories from a joint analysis of cosmic microwave background and astrophysical data
Daniela Paoletti, Dhiraj Kumar Hazra, Fabio Finelli +1
We show that by jointly fitting cosmic microwave background (CMB) and astrophysical data - a compilation of UV luminosity data from the Hubble Frontier Field and neutral hydrogen d…
Model-independent Reconstruction of UV Luminosity Function and Reionization Epoch
Debabrata Adak, Dhiraj Kumar Hazra, Sourav Mitra +1
We conduct a first comprehensive study of the Luminosity Function (LF) using a non-parametric approach. We use Gaussian Process to fit available luminosity data between redshifts $…
A search for super-imposed oscillations to the primordial power spectrum in Planck and SPT-3G 2018 data
Akhil Antony, Fabio Finelli, Dhiraj Kumar Hazra +2
We search for super-imposed oscillations linearly or logarithmically spaced in Fourier wavenumbers in Planck and South Pole Telescope (SPT-3G) 2018 temperature and polarization…
Euclid: The search for primordial features
M. Ballardini, Y. Akrami, F. Finelli +126
Primordial features, in particular oscillatory signals, imprinted in the primordial power spectrum of density perturbations represent a clear window of opportunity for detecting ne…
Free-form reconstruction of primordial power spectrum using Planck CMB temperature and polarization
Wuhyun Sohn, Arman Shafieloo, Dhiraj Kumar Hazra
While the simplest inflationary models predict the primordial perturbations to be near scale-invariant, the primordial power spectrum (PPS) can exhibit oscillatory features in many…
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
Rana X. Adhikari, Luis A. Anchordoqui, Ke Fang +118
Cosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probe…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Discordances in cosmology and the violation of slow-roll inflationary dynamics
Akhil Antony, Fabio Finelli, Dhiraj Kumar Hazra +1
We identify examples of single field inflationary trajectories beyond the slow-roll regime which improve the fit to Planck 2018 data compared to baseline CDM model with power la…
One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology
Dhiraj Kumar Hazra, Akhil Antony, Arman Shafieloo
Acoustic peaks in the Cosmic Microwave Background (CMB) temperature spectrum as observed by the Planck satellite appear to be smoother than our expectation from the standard model…
Primordial Standard Clock Models and CMB Residual Anomalies
Matteo Braglia, Xingang Chen, Dhiraj Kumar Hazra
The residuals of the power spectra of WMAP and Planck's cosmic microwave background (CMB) anisotropies data are known to exhibit a few interesting anomalies at different scales wit…
Dark Twilight Joined with the Light of Dawn to Unveil the Reionization History
Daniela Paoletti, Dhiraj Kumar Hazra, Fabio Finelli +1
Improved measurement of the Cosmic Microwave Background polarization from Planck allows a detailed study of reionization beyond the average optical depth. The lower value of the op…
Inflation Story: slow-roll and beyond
Dhiraj Kumar Hazra, Daniela Paoletti, Ivan Debono +3
We present constraints on inflationary dynamics and features in the primordial power spectrum of scalar perturbations using the Cosmic Microwave Background temperature, polarizatio…
Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
Matteo Braglia, Xingang Chen, Dhiraj Kumar Hazra
We propose an inflationary primordial feature model that can explain both the large and small-scale anomalies in the currently measured cosmic microwave background (CMB) anisotropy…
Gaussian Process Reconstruction of Reionization History
Aditi Krishak, Dhiraj Kumar Hazra
We reconstruct the history of reionization using Gaussian process regression. Using the UV luminosity data compilation from Hubble Frontiers Fields we reconstruct the redshift evol…
Comparing multi-field primordial feature models with the Planck data
Matteo Braglia, Xingang Chen, Dhiraj Kumar Hazra
In this paper, we use a complete model of classical primordial standard clocks as an example to develop a methodology of directly comparing numerical predictions from complicated m…