Higgs portal valleys, stability and inflation
Entidad
UAM. Departamento de Física TeóricaEditor
Springer VerlagFecha de edición
2015-09-30Cita
10.1007/JHEP09(2015)210
Journal of High Energy Physics 2015.9 (2015): 210
ISSN
1126-6708 (print); 1029-8479 (online)DOI
10.1007/JHEP09(2015)210Financiado por
GB thanks Perimeter Institute for hospitality at the very beginning of this work. Research at Perimeter Institute is supported in part by the Government of Canada through Industry Canada, and by the Province of Ontario through the Ministry of Research and Information (MRI). GB thanks as well the Departament de Física Fondamental at the Universitat de Barcelona and the CERN Theory Division for hospitality at different stages of this work. CT acknowledges support of the Spanish Government through grant FPA2011-24568 (MICINN), and thanks Rhorry Gauld and Anupam Mazumdar for useful conversations. GB thanks Brando Bellazzini, Alberto Casas, Mikael Chala, José Ramón Espinosa, Mathias Garny, Gian Giudice and Felix Kahlhoefer for valuable discussions and comments on a draft version of this work. We also thank Isabella Masina and Alessio Notari for useful exchangesProyecto
Gobierno de España. FPA2011-24568Versión del editor
http://dx.doi.org/10.1007/JHEP09(2015)210Materias
Beyond Standard Model; Cosmology of Theories beyond the SM; Effective field theories; Renormalization Group; FísicaNota
Journal of High Energy Physics 2015.9 (2015): 210 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Derechos
© 2015, The Author(s)Resumen
The measured values of the Higgs and top quark masses imply that the Standard Model potential is very likely to be unstable at large Higgs values. This is particularly problematic during inflation, which sources large perturbations of the Higgs. The instability could be cured by a threshold effect induced by a scalar with a large vacuum expectation value and directly connected to the Standard Model through a Higgs portal coupling. However, we find that in a minimal model in which the scalar generates inflation, this mechanism does not stabilize the potential because the mass required for inflation is beyond the instability scale. This conclusion does not change if the Higgs has a direct weak coupling to the scalar curvature. On the other hand, if the potential is absolutely stable, successful inflation in agreement with current CMB data can occur along a valley of the potential with a Mexican hat profile. We revisit the stability conditions, independently of inflation, and clarify that the threshold effect cannot work if the Higgs portal coupling is too small. We also show that inflation in a false Higgs vacuum appearing radiatively for a tuned ratio of the Higgs and top masses leads to an amplitude of primordial gravitational waves that is far too high, ruling out this possibility
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Google Scholar:Ballesteros, Guillermo
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Tamarit, Carlos
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