@misc{10481/91889,
year = {2023},
month = {11},
url = {https://hdl.handle.net/10481/91889},
abstract = {We investigate the potential of the warped extradimension framework as an explanation for the recently
observed stochastic gravitational background at nHz frequencies in pulsar timing arrays (PTA). Our
analysis reveals that the PTA data can be effectively accommodated by a first-order phase transition
triggered by a radion at the MeV-GeV scale feebly coupled to the Standard Model. Remarkably, this
outcome remains robust irrespective of the specific details of the warped extradimension embedding,
providing a foundation for future investigations aiming to develop concrete extradimension descriptions of
Nature. We also demonstrate that many existing embeddings are not viable, as their radion and graviton
phenomenology clash with a MeV–GeV scale radion. As a possible way out, we sketch a promising
solution involving multiple branes, wherein the light radion, graviton, and ensuing light resonances remain
consistent with collider bounds and gravity tests.},
organization = {Project
No. PID2020–114767GB-I00 funded by MCIN/AEI/
10.13039/501100011033},
organization = {FEDER/Junta de
Andalucía-Consejería de Economía y Conocimiento
2014-2020 Operational Programme under Grant No.
A-FQM-178-UGR18},
organization = {Junta de Andalucía under
Grant No. FQM-225},
organization = {The Ramón y Cajal Program of the
Spanish MICIN and by the European Social Fund under
Grant No. RYC-2016-20678},
organization = {The “Prórrogas de
Contratos Ramón y Cajal” Program of the University of Granada},
organization = {The grant Project.
No. 302640 funded by the Research Council of Norway},
organization = {Departament
d’Empresa i Coneixement, Generalitat de Catalunya, Grant No. 2021SGR00649},
organization = {Ministerio de
Economía y Competitividad, Grant No. PID2020–115845GB-I00},
organization = {CERCA program of the Generalitat de Catalunya},
publisher = {American Physical Society},
title = {Pulsar timing array stochastic background from light Kaluza-Klein resonances},
doi = {10.1103/PhysRevD.108.095017},
author = {Megías Fernández, Eugenio and Nardini, Germano and Quirós, Mariano},
}