Research
My primary research interests lies in the field of Cosmology
related to the periods in the early universe, commonly known as the Cosmic Dawn (CD) and the Epoch of Reionization (EoR), where
the first stars and galaxies were formed and which changed the thermal and ionization states of the Inter-Galactic Medium (IGM).
I use the 21-cm radiation, originating from the ground state of the neutral hydrogen (HI), as a probe for understanding the
fundamental issues regarding these periods.
I am currently focusing on understanding the transition of our Universe from cold and neutral state to the heated and ionized one through
the simulations of the expected 21-cm signal from the CD-EoR. I use the higher order Fourier statisitcs such as the Powerspectrum and the
Bispectrum to quantify and interpret the CD-EoR 21-cm signal. Specifically, I have/am studied/studying the various Line of Sight (LoS)
anisotropies such as the Redshift Space Distortions (RSD) and the Light cone effect, inherent in the signal, through the Spherically
Averaged Bispectrum (SABS). We have demonstrated that if one ignore these anisotropies, it might lead to a wrong interpretaion of the
signal. However, the information content of the RSD in the SABS is incomplete. To have an insight about complete RSD effects, we plan to
study the direction dependent bispectrum in near future while considering all non-zero angular multipole moments of the bispectrum.
I am also experienced with the image analysis technique such as the Largest Cluster Statisitcs (LCS) which provide us a better
understanding of the reionization topologies and the charecterisitics of the various source. Additionaly, I am experiencing the method
for constraining the EoR astrophysical parameters using ANN emulation based 21-cm bispectrum. I am also looking ahead to work on
the various challenges underway of detecting the expected 21-cm signal such as the noise, foregrounds, sytematics etc. in the context
of the 21-cm bispectrum. In addition to this, I am also interested in constraining the astrophysical parameters during the Cosmic Dawn
through the 21-cm bispectrum. These are hoped to provide the synergies between the statstical inference and the various physical models
during the CD-EoR though the upcoming SKA observations of this era.
Recent Works
1. CD 21-cm Bispectrum:
Redshifted 21-cm bispectrum – II.
Impact of the spin temperature fluctuations and redshift space distortions on the signal from the Cosmic Dawn
2. EoR 21-cm Bispectrum:
Redshifted 21-cm bispectrum – I.
Impact of the redshift space distortions on the signal from the Epoch of Reionization
