title: Cosmological Higgs-Axion Interplay for a Naturally Small Electroweak Scale.
abstract: Recently, a new mechanism to generate a naturally small electroweak scale has been proposed. It exploits the coupling of the Higgs boson to an axionlike field and a long era in the early Universe where the axion unchains a dynamical screening of the Higgs mass. We present a new realization of this idea with the new feature that it leaves no sign of new physics at the electroweak scale, and up to a rather large scale, 10^{9}  GeV, except for two very light and weakly coupled axionlike states. One of the scalars can be a viable dark matter candidate. Such a cosmological Higgs-axion interplay could be tested with a number of experimental strategies.
authors.affiliation: Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.|ICREA, Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, E-08010 Barcelona, Spain.
authors.forename: J R
authors.initials: JR
authors.lastname: Espinosa
authors.affiliation: Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.|ICREA, Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, E-08010 Barcelona, Spain.|DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Grojean
authors.affiliation: Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.
authors.forename: G
authors.initials: G
authors.lastname: Panico
authors.affiliation: Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona.
authors.forename: A
authors.initials: A
authors.lastname: Pomarol
authors.affiliation: Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.
authors.forename: O
authors.initials: O
authors.lastname: Pujolàs
authors.affiliation: Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST), Campus UAB, E-08193 Bellaterra (Barcelona), Spain.|ICREA, Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, E-08010 Barcelona, Spain.|DESY, Notkestrasse 85, 22607 Hamburg, Germany.|II. Institute of Theoretical Physics, University of Hamburg, D-22761 Hamburg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Servant