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Search: authors:"Lorenzo Ubaldi"

4 papers found.
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Some remarks on anthropic approaches to the strong CP problem

Abstract The peculiar value of θ is a challenge to the notion of an anthropic landscape. We briefly review the possibility that a suitable axion might arise from an anthropic requirement of dark matter. We then consider an alternative suggestion of Kaloper and Terning that θ might be correlated with the cosmological constant. We note that in a landscape one expects that θ is...

Is the relaxion an axion?

We consider the recently proposed cosmological relaxation mechanism where the hierarchy problem is ameliorated, and the electroweak (EW) scale is dynamically selected by a slowly rolling axion field. We argue that, in its simplest form, the construction breaks a gauge symmetry that always exists for pseudo-Nambu-Goldstone bosons (in particular the axion). The small parameter in...

Closing in on singlet scalar dark matter: LUX, invisible Higgs decays and gamma-ray lines

We study the implications of the Higgs discovery and of recent results from dark matter searches on real singlet scalar dark matter. The phenomenology of the model is defined by only two parameters, the singlet scalar mass m S and the quartic coupling a 2 between the SU(2) Higgs and the singlet scalar. We concentrate on the window 5 < m S /GeV < 300. The most dramatic impact on...

Precision tools and models to narrow in on the 750 GeV diphoton resonance

Kilian Nickel 4 g Toby Opferkuch 4 h Lorenzo Ubaldi 3 i Avelino Vicente 8 j Alexander Voigt 7 k 0 CPPM, Aix-Marseille Université , CNRS-IN2P3, UMR 7346, 163 avenue de Luminy, 13288 Marseille Cedex 9