Majumdar, Mahbubul AlamHasan, Walid2026-09-062026-09-0620262026ID 22311012https://hdl.handle.net/10361/29770This thesis is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Physics, 2026.Cataloged from PDF version of thesis.Includes bibliographical references (pages 67-68).In 4D particle phenomenology beyond the Standard Model, warped compactification of higher dimensional gravity provides a geometric mechanism for generating large hierarchies of 4D physical scales. However, realizing such backgrounds in supergravity is constrained by the Maldacena–Nu˜nez no-go theorem. Under its assumptions, two-derivative supergravity with positive-energy ingredients obstructs nontrivially warped compactifications to de Sitter or Minkowski space. In string theory, we can evade such a restriction by adding negative tension sources, such as orientifold planes, to the theory. We study the role of negative tension sources for a p-brane model, which can be generalised to a type II supergravity. We explicitly construct the localized source action for this model using Dirac–Born–Infeld and Wess–Zumino terms and match it to the p-brane background with compact internal space. We find that the compactness of the internal space requires an effective negative-tension source. Hence, we get an analogous realization of the mechanism by which orientifold-like negative-tension sources allow warped backgrounds in string theory.68 pagesen-USAttribution-NonCommercial-NoDerivatives 4.0 InternationalBRAC University theses 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.http://creativecommons.org/licenses/by-nc-nd/4.0/Warped compactificationSupergravityLocalized sourcesp-braneOrientifold planesSupergravity.Quantum theory.String models.Thesis