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False vacuum decay exact computation of the classical bounce
(BRAC University, 2016-01)
This thesis reviews the exact numerical computation of the classical bounce solution in
the false vacuum decay for a quartic scalar eld potential which is o set by an external
source. The decay rate in a semiclassical ...
A review of Eikonal approximation and recent applications
(BRAC University, 2016-03)
Non-local gravitational interactions and the black hole information paradox
(Brac University, 2019-12)
This thesis looks into Non-local gravitational interactions that hawking radiated quanta’s from Black holes might possess. We shall first explain Hawking’s original calculation in [1], and how such a process would lead to ...
Calculating the pion contribution to nucleon self-energy using chiral effective thermal field theory
(BRAC University, 2016)
Effective field theories have proven to be efficient tools for studying physics at length scales longer than that which is typical. Chiral Perturbation Theory is one of these EFTs which physicists rely on heavily to study ...
Perturbations on time dependent Orbifold Singularities
(Brac University, 2019-12)
We start with the standard time-dependent backgrounds such as the geometry and
dynamics of Freidmann-Robertson-Walker(FRW) cosmologies. First, we discuss the dynamics and geometry of FRW cosmologies. Then we introduce ...
An examination of the Big Bang Singularity using the matrix formulation of M-Theory
(BRAC University, 2020-09)
M theory is a proposed quantum theory of everything which is connected to
type IIA string theory via S duality. In its low energy limit, M theory is approximated by 11 dimensional supergravity.
In this thesis, we look ...
On some general relativistic compact anisotropic charged stellar models
(BRAC University, 2015-07-15)
With the presence of electric charge and pressure anisotropy some anisotropic stellar models have been developed. An algorithm presented by Herrera et al. (Phys. Rev, D 77, 027502 (2008)) to generate static spherically ...
Simulation of electronic properties of a quantum dot in transistor geometry at varying temperatures
(BRAC University, 2016-03)
Electrical conduction is the
ow of electron due to a force applied by an
electric eld. In bulk material, conduction process obeys Ohm's law. The
law states that current is proportional to applied voltage. But nano-sized ...
Nonperturbative phenomena in field theory and gravity, and use of Borel summation to capture nonperturbative information
(BRAC University, 2017-12)
This thesis addresses non-perturbative phenomena and techniques to analyze nonperturbative
problems. First, we discuss the simplest non-perturbative example in
quantum gravity: blackholes, and how they non-perturbatively ...