I am a Theoretical Cosmologist who is trying to understand various fundamental issues related with the formation and evolution of the very first sources of light in the early Universe. I majorly use the 21-cm radiation, which originates from the neutral atomic hydrogen in its ground state, as a probe to the early Universe. I did my Ph.D. research in the field of Reionization Cosmology under Prof. Somnath Bharadwaj at the Department of Physics, IIT Kharagpur. At present, I am a Postdoctoral Researcher working with Prof. Saleem Zaroubi at the Astrophysics Research Center, The Open University of Israel.

My research work is focussed on unravelling the very important last phase transition (from cold-neutral to hot-ionized) of our Universe using theoretical models and simulations of the redshifted 21-cm signal from the Cosmic Dawn and Epoch of Reionization. I use higher-order Fourier statistics (e.g., Power spectrum, Bispectrum, Trispectrum) to interpret the Cosmic dawn and Reionization 21-cm signal. I also use the Bayesian inference techniques (e.g., Fisher matrix, MCMC) to constrain various model parameters using the signal statistics.

I look forward to developing the statistical tool based pipelines which will be deployed on the real-world 21-cm data. In addition to this, I would like to work on other challenges (foregrounds, systematics etc.) in the field of 21-cm cosmology. Nevertheless, my interests also extends towards exploring the synergies between the 21-cm signal and the other cosmological/astrophysical probes such as the Cosmic Microwave Background Radiation and the Ly-α emitters. The synergies will provide different prespectives to address the above fundamental issues and can revolutionize our current understanding of this field. Last but not the least, I am also interested in the use of machine learning algorithms in astronomy.

Hobbies: Anime (アニメ), Manga (マンガ), Cooking, Bi-Cycling, Music (various global languages), Friendly debates, Football, Badminton, Table Tennis, Volleyball, Video Games, Movies etc.

Research

Recent Works

Reionization Parameter Estimation

Impact of non-Gaussianity on reionization parameter estimation using spherically average power spectrum estimator.

Reionization Power Spectrum Measurement using SKA-Low

Impact of non-Gaussianity on measuring reionization spherically average power spectrum using future SKA-Low telescope.

Publication list:

1. Tiwari H., Shaw A. K., Majumdar S., Kamran M., Choudhury M., Improving constraints on the reionization parameters using 21-cm bispectrum, 2022, JCAP, 2022, 045
2. Shaw A. K., Bharadwaj S., Sarkar D., Mazumdar A., Singh S., Majumdar S., A fast estimator for quantifying the shape dependence of the 3D bispectrum, 2021, JCAP, 2021, 024
3. Mondal R., Mellema G., Shaw A. K., Kamran M., Majumdar S., The Epoch of Reionization 21-cm bispectrum: the impact of light-cone effects and detectability, 2021, MNRAS, 508, 3848
4. Shaw A. K., Bharadwaj S., Mondal R., The impact of non-Gaussianity on the Epoch of Reionization parameter forecast using 21-cm powerspectrum measurements, 2020, MNRAS, 498, 1480
5. Mondal R., Shaw A. K., Iliev I. T., Bharadwaj S., Datta K. K., Majumdar S., Sarkar A. K., Dixon K. L., Predictions for measuring the 21-cm multifrequency angular power spectrum using SKA-Low, 2020, MNRAS, 494, 4043
6. Shaw A. K., Bharadwaj S., Mondal R., The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization 21-cm power spectrum, 2019, MNRAS, 487, 4951
7. Mondal R., Bharadwaj S., Iliev I. T., Datta K. K., Majumdar S., Shaw A. K., Sarkar A. K., A method to determine the evolution history of the mean neutral Hydrogen fraction, 2019, MNRAS: Letters, 483, L109

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