Radion dynamics, heavy Kaluza-Klein resonances and gravitational waves

Abstract

We study the confinement/deconfinement phase transition of the radion field in a warped model with a polynomial bulk potential. The backreaction of the radion on the metric is taken into account by using the superpotential formalism, while the radion effective potential is obtained from a novel formulation which can incorporate the backreaction. The phase transition leads to a stochastic gravitational wave background that depends on the energy scale of the first Kaluza-Klein resonance, $m_{\text{KK}}$. This work completes previous studies in the following aspects: i) we detail the evaluation of the radion spectrum; ii) we report on the mismatches between the thick wall approximation and the numerical bounce solution; iii) we include a suppression factor in the spectrum of sound waves accounting for their finite lifetime; and, iv) we update the bound on $m_{\text{KK}}$ in view of the O3 LIGO and Virgo data. We find that the forthcoming gravitational wave interferometers can probe scenarios where $m_{\text{KK}}\lesssim 10^9$ TeV, while the O3-run bounds rule out warped models with $10^4\text{TeV}\lesssim m_{\text{KK}}\lesssim 10^7$ TeV exhibiting an extremely strong confinement/deconfinement phase transition.

16 pages, 7 figures; v2 extended version: added references and Figs. 2, 3, 5 and 7 (lower panels), Figs. 6 and 7 (upper panels) updated, extended discussion in Secs. 3.3, 4, 5 and 6. Talk given by E.Megias at the 9th International Conference on New Frontiers in Physics (ICNFP 2020), 4 Sep - 2 Oct 2020, Kolymbari, Crete, Greece

References in corpus (9)

• Gravitational Wave Production by Collisions: More Bubbles
• Upper Limits on the Isotropic Gravitational-Wave Background from Advanced LIGO's and Advanced Virgo's Third Observing Run
• Gravitational Waves from Warped Spacetime
• Improved reconstruction of a stochastic gravitational wave background with LISA
• A Confining Strong First-Order Electroweak Phase Transition
• Suppressing Electroweak Precision Observables in 5D Warped Models
• Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Gravitational waves from a holographic phase transition
• Gravitational Imprints from Heavy Kaluza-Klein Resonances

Cited by in corpus (1)

• The Continuum Linear Dilaton