255 citations · 619 across the 29 of their papers we have counts for
29 papers
Thurston geometries and parameter constraints from SNIa data
Tanay Gupta, Anshul Verma, Sukanta Panda +1
Following the numerous evidence for large-scale cosmic isotropy violation with the advent of the `precision cosmology' era, we explore the possible advantages of extending the flat…
Examination of frequency and scale dependence of CMB hemispherical power asymmetry
Sanjeev Sanyal, Pavan Kumar Aluri, Arman Shafieloo
In this study, we revisit the well-known cosmic microwave background (CMB) anomaly referred to as Hemispherical Power Asymmetry (HPA), using CMB temperature maps from the Planck mi…
Cosmology-informed Neural Networks to infer dark energy equation-of-state
Anshul Verma, Shashwat Sourav, Pavan K. Aluri +1
We present a framework that combines physics-informed neural networks (PINNs) with Markov Chain Monte Carlo (MCMC) inference to constrain dynamical dark energy models using the Pan…
Probing foreground residuals in cleaned CMB temperature maps from Planck
Sanjeet K. Patel, Pavan K. Aluri, Pranati K. Rath +1
Maps of cosmic microwave background (CMB) are extracted from multi-frequency observations using a variety of cleaning procedures. However, in regions of strong microwave emission,…
Examining statistical isotropy of CMB low multipoles from Planck PR4 data
Pavan Kumar Aluri, Sanjeet Kumar Patel
Low multipoles () in cosmic microwave background (CMB) temperature anisotropies have shown some `peculiarities' when examined since the release of the full sky CMB maps, using a…
Cosmographic constraints on a Gödel-type rotating universe
Anshul Verma, Pavan K. Aluri, David F. Mota +1
We investigate the possibility of global cosmic rotation using a Gödel-type rotating cosmological model, constrained through a cosmographic analysis of Type Ia supernovae (SNIa) fr…
A reassessment of LVE method and hemispherical power asymmetry in CMB temperature data from Planck PR4
Sanjeev Sanyal, Sanjeet K. Patel, Pavan K. Aluri +1
We undertake a reassessment of one of the large angular scale anomalies observed in cosmic microwave background (CMB) temperature signal referred to as Hemispherical Power Asymmetr…
Anisotropic universe with anisotropic dark energy
Anshul Verma, Pavan K. Aluri, David F. Mota
We investigate the anisotropic parameterization of the dark energy equation of state within the framework of an axisymmetric (planar) Bianchi-I universe. Using the latest Pantheon+…
CMB low multipole alignments across WMAP and \emph{Planck} data releases
Sanjeet Kumar Patel, Pavan Kumar Aluri, John P. Ralston
The first observations of the cosmic microwave background (CMB) from NASA's \emph{Wilkinson Microwave Anisotropy Probe} (WMAP) led to finding `alignment' anomalies not expected fro…
Constraints on Bianchi-I type universe with SH0ES anchored Pantheon+ SNIa data
Anshul Verma, Sanjeet K. Patel, Pavan K. Aluri +2
We study the Bianchi-I cosmological model motivated by signals of statistical isotropy violation seen in cosmic microwave background (CMB) observations and others. To that end, we…
Is the Observable Universe Consistent with the Cosmological Principle?
Pavan Kumar Aluri, Paolo Cea, Pravabati Chingangbam +20
The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is conven…
Parity in Planck full-mission CMB temperature maps
Srikanta Panda, Pavan K. Aluri, Pramoda Kumar Samal +1
In the standard model of cosmology, Cosmic Microwave Background (CMB) sky is expected to show no symmetry preferences. Following our previous studies, we explore the presence of an…
Large angular scale multipoles at redshift ~0.8
Prabhakar Tiwari, Pavan K. Aluri
We prepare the full sky radio galaxy map () using the north NVSS and south SUMSS galaxy catalogs and study the large scale multipoles anomalies. These galaxies are…
Power asymmetry in CMB polarization maps from PLANCK : a local variance analysis
Pavan K. Aluri, Arman Shafieloo
A persistent signal of power asymmetry on opposite hemispheres of CMB sky was seen in full-sky temperature measurements made so far. This asymmetry was seen in microwave sky from W…
Testing statistical Isotropy in Cosmic Microwave Background Polarization maps
Pranati K. Rath, Pramoda Kr. Samal, Srikanta Panda +2
We apply our symmetry based Power tensor technique to test conformity of PLANCK Polarization maps with statistical isotropy. On a wide range of angular scales (l=40-150), our preli…
Alignments of parity even/odd-only multipoles in CMB
Pavan K. Aluri, John P. Ralston, Amanda Weltman
We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from PLANCK full mission temperature measurements. An excess power in odd m…
An Improved Diffuse Foreground Subtraction by ILC method: CMB Map and Angular Power Spectrum using Planck and WMAP Observations
Vipin Sudevan, Pavan K. Aluri, Sarvesh Kumar Yadav +2
We report an improved technique for diffuse foreground minimization from Cosmic Microwave Background (CMB) maps using a new multi-phase iterative internal-linear-combination (ILC)…
Recovering hidden signals of statistical anisotropy from a masked or partial CMB sky
Pavan K. Aluri, Nidhi Pant, Aditya Rotti +1
Any isotropy violating phenomena on cosmic microwave background (CMB) induces off-diagonal correlations in the two-point function. These correlations themselves can be used to esti…
A Perturbative Analysis of Synchrotron Spectral Index Variation over Microwave Sky
Rajib Saha, Pavan Kumar Aluri
In this paper, we implement a perturbative approach, first proposed by Bouchet & Gispert (1999), to estimate variation of spectral index of galactic polarized synchrotron emission,…
A novel approach to reconstructing signals of isotropy violation from a masked CMB sky
Pavan K. Aluri, Nidhi Pant, Aditya Rotti +1
Statistical isotropy (SI) is one of the fundamental assumptions made in cosmological model building. This assumption is now being rigorously tested using the almost full sky measur…
Relating the inhomogeneous power spectrum to the CMB hemispherical anisotropy
Pranati K. Rath, Pavan K. Aluri, Pankaj Jain
We relate the observed hemispherical anisotropy in the cosmic microwave radiation data to an inhomogeneous power spectrum model. The hemispherical anisotropy can be parameterized i…
Direction dependence of the power spectrum and its effect on the Cosmic Microwave Background Radiation
Pranati K. Rath, Tanmay Mudholkar, Pankaj Jain +2
We study several anisotropic inflationary models and their implications for the observed violation of statistical isotropy in the CMBR data. In two of these models the anisotropy d…
Cross-correlation analysis of CMB with foregrounds for residuals
Pavan K. Aluri, Pranati K. Rath
In this paper, we try to probe whether a clean CMB map obtained from the raw satellite data using a cleaning procedure is sufficiently clean. Specifically we study if there are any…
Parity Asymmetry in the CMBR Temperature Power Spectrum
Pavan K. Aluri, Pankaj Jain
We study the power asymmetry between even and odd multipoles in the multipolar expansion of CMB temperature data from WMAP, recently reported in the literature. We introduce an alt…