This thesis is dedicated to studying field theories and has three parts. The first two parts are on aspects of non relativistic field theories. By taking 2 classical field theories namely, Landau's theory of superfluidity ...

This thesis presents a study of the quasilocal stress tensor proposed by Brown and York in 1993 from the perspective of the AdS/CFT correspondence which was carried out by Kraus and Balasubramanian in 1999. The thesis ...