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Gravitational corrections to Standard Model vacuum decay
Gino Isidori, Vyacheslav S. Rychkov, Alessandro Strumia +1
We refine and update the metastability constraint on the Standard Model top and Higgs masses, by analytically including gravitational corrections to the vacuum decay rate. Present…
Cosmology and Astrophysics of Minimal Dark Matter
Marco Cirelli, Alessandro Strumia, Matteo Tamburini
We consider DM that only couples to SM gauge bosons and fills one gauge multiplet, e.g. a fermion 5-plet (which is automatically stable), or a wino-like 3-plet. We revisit the comp…
The golden ratio prediction for the solar neutrino mixing
Yuji Kajiyama, Martti Raidal, Alessandro Strumia
We present a simple texture that predicts the cotangent of the solar neutrino mixing angle to be equal to the golden ratio. This prediction is 1.4 standard deviations below the pre…
New bounds on millicharged particles from cosmology
Alessandro Melchiorri, Antonello Polosa, Alessandro Strumia
Particles with millicharge q and sub-eV mass can be produced in photon-photon collisions, distorting the energy spectrum of the Cosmic Microwave Background. We derive the conservat…
Thermal production of gravitinos
Vyacheslav S. Rychkov, Alessandro Strumia
We reconsider thermal production of gravitinos in the early universe, adding to previously considered 2 -> 2 gauge scatterings: a) production via 1 -> 2 decays, allowed by thermal…