Higgs-Dilaton cosmology: Are there extra relativistic species?
Entity
UAM. Departamento de Física TeóricaPublisher
ElsevierDate
2012-12-05Citation
10.1016/j.physletb.2012.10.075
Physics Letters B 718.2 (2012) 507-511
ISSN
0370-2693 (print); 1873-2445 (online)DOI
10.1016/j.physletb.2012.10.075Funded by
This work was partially supported by the Swiss National Science Foundation. We also acknowledge financial support from the Madrid Regional Government (CAM) under the program HEPHACOS S2009/ESP-1473-02, from MICINN under grant AYA2009- 13936-C06-06 and Consolider-Ingenio 2010 PAU (CSD2007-00060), as well as from the European Union Marie Curie Initial Training Network “UNILHC” PITN-GA-2009-237920Project
Comunidad de Madrid. S2009/ESP-1473-02/HEPHACOS; Gobierno de España. AYA2009- 13936-C06-06; Gobierno de España. CSD2007-00060; info:eu-repo/grantAgreement/EC/FP7/237920Editor's Version
http://dx.doi.org/10.1016/j.physletb.2012.10.075Subjects
Dilaton; Effective number of neutrinos; Higgs inflation; Preheating; Scale invariance; FísicaRights
© 2012 Elsevier B.VAbstract
Recent analyses of cosmological data suggest the presence of an extra relativistic component beyond the Standard Model content. The Higgs–Dilaton cosmological model predicts the existence of a massless particle – the dilaton – associated with the spontaneous symmetry breaking of scale invariance and undetectable by any accelerator experiment. Its ultrarelativistic character makes it a suitable candidate for contributing to the effective number of light degrees of freedom in the Universe. In this Letter we analyze the dilaton production at the (p)reheating stage right after inflation and conclude that no extra relativistic degrees of freedom beyond those already present in the Standard Model are expected within the simplest Higgs–Dilaton scenario. The elusive dilaton remains thus essentially undetectable by any particle physics experiment or cosmological observation
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Google Scholar:García-Bellido Capdevila, Juan
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Rubio, Javier
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Shaposhnikov, Mikhail
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