Geophysical evidences for a thick crust south of Palghat-Tiruchi gap in the High Grade Terrains of South India

The regional gravity and magnetic features of the South Indian Shield were discussed. The prominent regional gravity low of 20 to 30 mgls over the charnockite terrain of South India, coupled with the correlation of a steep gravity gradient with a prominent shear zone to the north, can be interpreted in terms of increased crustal thickness in the South Indian high-grade terrain. There is some support for this from deep seismic sounding. The magnetic signature of the high-grade terrain is also distinctive, and Mishra argued that the Palghat-Tiruchi line might represent a Precambrian boundary such as a suture between two distinct crustal blocks

A Variational Approach to Bound States in Quantum Field Theory

We consider here in a toy model an approach to bound state problem in a nonperturbative manner using equal time algebra for the interacting field operators. Potential is replaced by offshell bosonic quanta inside the bound state of nonrelativistic particles. The bosonic dressing is determined through energy minimisation, and mass renormalisation is carried out in a nonperturbative manner. Since the interaction is through a scalar field, it does not include spin effects. The model however nicely incorporates an intuitive picture of hadronic bound states in which the gluon fields dress the quarks providing the binding between them and also simulate the gluonic content of hadrons in deep inelastic collisions.Comment: latex, revtex, 22 page