Reducing constraints in a higher dimensional extension of the Randall and Sundrum model

• Published in: The journal of high energy physics Vol. 2011; no. 3
• Main Authors: Archer, Paul R., Huber, Stephan J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.03.2011; Springer Nature B.V
• Subjects: Classical and Quantum Gravitation; Cosmological constant; Einstein equations; Electroweak model; Elementary Particles; High energy physics; Lower bounds; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Relativity Theory; String Theory; Symmetry; Phenomenology of Large extra dimensions
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP03(2011)018

In order to investigate the phenomenological implications of warped spaces in more than five dimensions, we consider a 4 + 1 + δ dimensional extension to the Randall and Sundrum model in which the space is warped with respect to a single direction by the presence of an anisotropic bulk cosmological constant. The Einstein equations are solved, giving rise to a range of possible spaces in which the δ additional spaces are warped. Here we consider models in which the gauge fields are free to propagate into such spaces. After carrying out the Kaluza Klein (KK) decomposition of such fields it is found that the KK mass spectrum changes significantly depending on how the δ additional dimensions are warped. We proceed to compute the lower bound on the KK mass scale from electroweak observables for models with a bulk SU(2) × U(1) gauge symmetry and models with a bulk SU(2) R × SU(2) L × U(1) gauge symmetry. It is found that in both cases the most favourable bounds are approximately M KK ≳ 2 TeV, corresponding to a mass of the first gauge boson excitation of about 4 – 6 TeV. Hence additional warped dimensions offer a newwayof reducing the constraints on the KK scale.