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Since my research career has just begun in my postgraduate study, I have accumulated very little experience in several research fields. Over the last year, I have gained some research experience in the areas like Plasma Astrophysics, Theoretical Astrophysics, Theoretical Cosmology, etc. Some of my research experiences are listed below:
Observational Aspects of Primordial Cosmology: Impacts in Gravitational Waves
Observational Aspects of Primordial Cosmology: Impacts in Gravitational Waves
The Thanu Padmanabhan Centre for Cosmology and Science Popularization
Guide: Dr. Sayantan Choudhury
Positive proof of a gravitational wave (GW) background is provided by the 15-year pulsar timing data set gathered by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). We have looked into various possible cosmological explanations for this signal, including cosmic inflation, scalar-induced GWs, first-order phase transitions, cosmic strings, and domain walls. Numerous cosmological models appear to offer a better fit than the conventional theory of inspiraling supermassive black hole binaries (SMBHBs), leading to Bayes factors. To date, these discoveries should not be taken as proof of new physics because they heavily depend on modeling assumptions regarding the cosmic SMBHB population. Additionally, we pinpoint locations with excluded parameter values where cosmic sources' estimated GW signals greatly outperform the NANOGrav signal.
An Investigation of the Dynamical Characteristics of Cloud Collisions in Galaxy Gaseous Disks
An Investigation of the Dynamical Characteristics of Cloud Collisions in Galaxy Gaseous Disks
Indian institute of Technology Indore
Guide: Dr. Narendra Nath Patra
How the gas in stars turns into stars is a key subject in their development and evolution. HI, gas typically undergoes a transformation into molecular gas before collapsing to produce stars. However, theoretically, a variety of instabilities (such as gravitational instability, a feedback mechanism, etc.) are what causes stars to emerge. Several earlier studies investigated how these processes affected star formation. Although it has not been extensively investigated, it is possible that the collision of the clouds in their orbits will be significant. The epicyclic motions of the clouds at various radii would cause them to cross each other's orbits, which would result in collisions. We are trying to determine the exact orbits of clouds in the galactic disc of NGC 6946, NGC 7331, and NGC 5055 by computing their motion equations and quantifying the collision rates.
M.Sc. Dissertation: An Analysis of Dust Emission in the Diffuse Interstellar Medium
M.Sc. Dissertation: An Analysis of Dust Emission in the Diffuse Interstellar Medium
National Institute of Science Education and Research, Bhubaneswar
National Institute of Science Education and Research, Bhubaneswar
Supervisor: Dr. Tuhin Ghosh
From far-infrared to microwave frequencies, the distinctive characteristics of dust emission in the diffuse interstellar medium (ISM) may be described using the correlation research between dust and HI. The southern hemisphere of the sky is ideal for examining the cosmic microwave and infrared backgrounds and is included in the scope of this study. Galactic dust emission is one of the significant foregrounds in measurements of the Cosmic Microwave Background (CMB) intensity and polarization at frequencies above 100 GHz. Therefore, it is essential to define the dust emission properties at Planck high frequencies employing its cross-correlation, around the southern galactic pole. The major objective of this study is to discuss in detail the mechanism that simultaneously calculates the zero levels of the Planck temperature maps and the emissivities of the dust as well as their spatial and spectral variation.
Component Separation Techniques for Cosmic Microwave Background Experiments
Component Separation Techniques for Cosmic Microwave Background Experiments
National Institute of Science Education and Research, Bhubaneswar
National Institute of Science Education and Research, Bhubaneswar
Guide: Dr. Tuhin Ghosh
In the different observations of astrophysics and particularly in the case of CMB experiments, several components or sources contribute to the images and signals. In the observed sets of data, these components are in the form of a mixture. Component separation consists, for each of them, in isolating the emission from all the other components present in the data, in the best possible way. There are several techniques for component separation such as Internal Linear Combination (ILC), Maximum Entropy Method (MEM), etc. So the main goal of this project is to discuss in detail the component separation techniques in the CMB experiments and the main underlying assumptions.
A Study on Linearised Gravity and Gravitational Waves
A Study on Linearised Gravity and Gravitational Waves
Indian Institute of Information Technology Allahabad
Guide: Dr. Srijit Bhattacharjee
In summary, linearized gravity is an approximation technique used to simplify the equations of general relativity, and it provides a framework to study the propagation of gravitational waves. Gravitational waves are ripples in spacetime caused by accelerating masses or changes in mass distributions. The study of gravitational waves has led to significant advancements in our understanding of astrophysics and the nature of gravity itself. The main objective of this project is to study the linearized gravity and the causes of the stochastic nature of the early universe gravitational wave background.
Detecting the Presence of Dark Matter in Galaxies using Gravitational Lensing
Detecting the Presence of Dark Matter in Galaxies using Gravitational Lensing
Society for Space Education Research & Development (SSERD), Bangalore
Guide: Dr. Sundar M N
About 85 percent of the total matter of the universe is non-luminous and is one of the greatest mysteries in the field of astronomy to date. Gravitational lensing is a unique probe of dark matter and dark energy. We aim to make optimal use of this technique to find the mass of the dark matter present as a halo using gravitational lensing. We calculated the mass of dark matter, for 10 galaxies, which acts as a lens, and a comparative analysis was done for the same. Using the obtained data from 10 galaxies, the graph is plotted to study and verify the relation between the total mass of the galaxy and the radius of the Einstein ring, and a quadratic variation was confirmed.
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