Cosmological phase transitions in warped space: gravitational waves and collider signatures
Abstract
We study the electroweak phase transition within a 5D warped model including a scalar potential with an exponential behavior, and strong backreaction over the metric, in the infrared. By means of a novel treatment of the superpotential formalism, we explore parameter regions that were previously inaccessible. We find that for large enough values of the t'Hooft parameter (e.g. N ≃ 25) the holographic phase transition occurs, and it can force the Higgs to undergo a first order electroweak phase transition, suitable for electroweak baryogenesis. The model exhibits gravitational waves and colliders signatures. It typically predicts a stochastic gravitational wave background observable both at the Laser Interferometer Space Antenna and at the Einstein Telescope. Moreover the radion tends to be heavy enough such that it evades current constraints, but may show up in future LHC runs.
 Publication:

Journal of High Energy Physics
 Pub Date:
 September 2018
 DOI:
 10.1007/JHEP09(2018)095
 arXiv:
 arXiv:1806.04877
 Bibcode:
 2018JHEP...09..095M
 Keywords:

 Beyond Standard Model;
 Cosmology of Theories beyond the SM;
 Field Theories in Higher Dimensions;
 High Energy Physics  Phenomenology;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 58 pages, 8 figures, 6 tables