Majumdar, Dr. Mahabubul AlamRahman, Md Ashiq2018-02-262018-02-2620172017-12ID 12211001http://hdl.handle.net/10361/9554This thesis is submitted in a partial fulfillment of the requirements for the degree of Bachelor of Science in Physics.Cataloged from PDF version of thesis.Includes bibliographical references (page 82-85).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 emit Hawking Radiation. This is directly linked to the blackhole information paradox. We then discuss non-perturbative phenomena in quantum eld theory. In particular, we discuss instantons in Yang-Mills and large-N sigma models. We discuss Borel summation as a technique to capture non-perturbative terms in a perturbative expansion. We apply Borel summation to the simple Painleve-I system and solve it numerically.85 pagesenBRAC University thesis reports are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.Nonperturbative phenomenaBorel summationThesis