Research

Tarun Souradeep built and led a cosmology subgroup on Cosmic Microwave background (CMB) studies at IUCAA, Pune, India (nov 2000 till July 2019) and now at IISER Pune, since August 2019, working on multiple aspects of CMB theory and observations. Souradeep’s current primary research interest is to test some of the fundamental assumptions in the concordance model of cosmology. He has been strongly involved in quantifying and understanding possible hints of subtle violations of statistical isotropy of the observed CMB sky that may challenge the cosmological principle. Another major stream of research has been on the search for features in, and deviations from the scale free form of, the primordial power spectrum of fluctuations in the universe. He has also worked on developing methods for cleaning foreground emissions, modelling response beam asymmetry and other systematic effects that affect these searches. Souradeep’s research employs advanced mathematical formulations and statistical techniques for robustly extracting subtle signature from the CMB data

Specialisation areas in Astronomy & Astrophysics

• Cosmology

– Cosmic Microwave Background (CMB)

– Large-Scale Structure in the Universe

– Primordial cosmological perturbations from Inflation.

– Early Universe and applications of QFT in curved spacetime.

• Gravitational wave (GW) Physics & Astronomy
– Lead roles in Indian observational programs in GW observations:

Direct detection (LIGO-India) and through CMB polarisation (CMB-Bhārat)
Stochastic GW background (LIGO network and CMB)

Selected Publications

(as Faculty, post 2000)

Measuring Statistical isotropy of the CMB anisotropy, Amir Hajian and Tarun Souradeep, Astrophysical Journal Letters 597, L5-L8, 2003
Primordial power spectrum from WMAP, Arman Shafieloo and Tarun Souradeep, Physical Review D 70, 043523-(1--14), (2004)
CMB Power spectrum estimation using Non-circular beams, Sanjit Mitra, Anand S. Sengupta and Tarun Souradeep
A blind estimation of the power spectrum of CMB anisotropy from WMAP, Rajib Saha , Pankaj Jain and Tarun Souradeep, Astrophysical Journal Letters 645, L89, (2006).
Statistical Isotropy of CMB Polarization Maps, Soumen Basak, Amir Hajian and Tarun Souradeep, Physical Review D 74 021301(R) (2006)
Gravitational Wave radiometry: Mapping a stochastic gravitational wave background, Sanjit Mitra, Sanjeev Dhurandhar, Tarun Souradeep, Albert Lazzarini, Vuk Mandic, Sukanta Bose, Stefan Ballmer, Physical Review D 77, 042002 (2008)
Model Independent Foreground Power Spectrum Estimation using WMAP 5-year Data, Tuhin Ghosh, Rajib Saha, Pankaj Jain, Tarun Souradeep, Physical Review D79, 123011, (2009)
Foreground Maps in WMAP frequency bands, Tuhin Ghosh, Jacques Delabrouille, Mathieu Remazeilles, Jean-Francois Cardoso, Tarun Souradeep, Mon. Not. Roy. Astron. Soc. 412, 883, (2011)
The Odd-Parity CMB Bispectrum, Marc Kamionkowski and Tarun Souradeep, Physical Review D83, 027301 (2011)
A New Window into Stochastic Gravitational Wave Background, Aditya Rotti, Tarun Souradeep, Physical Review Letters 109, 221301 (2012)
Planck 2013 results. I. Overview of products and scientific results, Planck Collaboration, P. Ade et al. Astronomy and Astrophysics, 571, AA1, (2014)
Planck 2013 results. XXIII. Isotropy and statistics of the CMB, Planck Collaboration, P. Ade et al., Astronomy and Astrophysics, 571, AA23, (2014)
Unveiling acoustic physics of the CMB using nonparametric estimation of the temperature angular power spectrum for Planck, Amir Aghamousa, Arman Shafieloo, Mihir Arjunwadkar & Tarun Souradeep, Journal of Cosmology and Astro-Particle Physics, 2, 007, (2015)
Bayesian inference on the sphere beyond statistical isotropy, Santanu Das, Benjamin D. Wandelt & Tarun Souradeep, Journal of Cosmology and Astro-Particle Physics, 10, 050, (2015)
Statistical isotropy violation in WMAP CMB maps resulting from non-circular beams, Santanu Das, Sanjit Mitra, Aditya Rotti, Nidhi Pant & Tarun Souradeep , Astronomy and Astrophysics, 591, A97, (2016)
Planck 2015 results. XVI. Isotropy and statistics of the CMB, Planck Collaboration P. Ade et al., Astronomy and Astrophysics, 594, A1, (2016)
Litmus Test for Cosmic Hemispherical Asymmetry in the Cosmic Microwave Background B -Mode Polarization, Suvodip Mukherjee & Tarun Souradeep, Physical Review Letters, 116, 221301, (2016)
Observation of Gravitational Waves from a Binary Black Hole Merger, LIGO Scientific Collaboration Abbott, B.~P., et al., Physical Review Letters, 116, 061102, (2016)
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral , LIGO Scientific Collaboration Abbott, B.~P., et al. Physical Review Letters, 119, 161101, (2017).
Joint Bayesian analysis of large angular scale CMB temperature anomalies, Shabbir Shaikh, Suvodip Mukherjee, Santanu Das, Benjamin D. Wandelt & Tarun Souradeep, Journal of Cosmology and Astroparticle Physics, 201, 007, (2019)
B-mode forecast of CMB-Bhārat
Adak, Debabrata; Sen, Aparajita; Basak, Soumen; Delabrouille, Jacques; Ghosh, Tuhin; Rotti, Aditya; Martinez-Solaeche, Gines; Souradeep, Tarun MNRAS, 514, 3002 (2022).
Capturing Statistical Isotropy Violation with Generalized Isotropic Angular Correlation Functions of Cosmic Microwave Background Anisotropy

Dipanshu; Souradeep, Tarun; Shriya Hirve; Astrophysical Journal, 954, 181, (2023).

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