Sitender Pratap Kashyap

Sitender Pratap Kashyap
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Sitender Pratap Kashyap
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High Energy Physics - Theory (2)
 
High Energy Physics - Phenomenology (1)
 
Cosmology and Nongalactic Astrophysics (1)
 
General Relativity and Quantum Cosmology (1)

Publications Authored By Sitender Pratap Kashyap

We review recent developments in the construction of heterotic and type II string field theories and their various applications. These include systematic procedures for determining the shifts in the vacuum expectation values of fields under quantum corrections, computing renormalized masses and S-matrix of the theory around the shifted vacuum and a proof of unitarity of the S-matrix. The S-matrix computed this way is free from all divergences when there are more than 4 non-compact space-time dimensions, but suffers from the usual infrared divergences when the number of non-compact space-time dimensions is 4 or less. Read More

In a metastable de Sitter space any object has a finite life expectancy beyond which it undergoes vacuum decay. However, by spreading into different parts of the universe which will fall out of causal contact of each other in future, a civilization can increase its collective life expectancy, defined as the average time after which the last settlement disappears due to vacuum decay. We study in detail the collective life expectancy of two comoving objects in de Sitter space as a function of the initial separation, the horizon radius and the vacuum decay rate. Read More