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36 papers · 1 filter
The Effective Lagrangian of the Two Higgs Doublet Model
P. Ciafaloni, D. Espriu
We consider the two Higgs doublet model extension of the Standard Model in the limit where all physical scalar particles are very heavy; too heavy, in fact, to be experimentally pr…
New Astrophysical Constraints on the Mass of the Superlight Gravitino
J. A. Grifols, R. N. Mohapatra, A. Riotto
In some supergravity models, the superlight gravitino is accompanied by a light weakly coupled scalar (S) and pseudo-scalar (P) particle. The coupling of these particles to matter…
Nonlinear bulk viscosity and inflation
Roy Maartens, Vicenc Mendez
We develop a nonlinear generalisation of the causal linear thermodynamics of bulk viscosity, incorporating positivity of the entropy production rate and the effective specific entr…
Naturalness bounds on gauge mediated soft terms
Paolo Ciafaloni, Alessandro Strumia
After a general discussion about the quantitative meaning of the naturalness upper bounds on the masses of supersymmetric particles, we compute these bounds in models with gauge-me…
Leptonic Photons and Nucleosynthesis
J. A. Grifols, E. Masso
Should long-range forces be associated to electron, muon and/or tau quantum number then their ''fine structure constants" are seen to be bound by nucleosynthesis data to be…
Astrophysical bounds on superlight gravitinos
J. A. Grifols, R. N. Mohapatra, A. Riotto
We derive the allowed mass range for the superlight gravitino present in a large class of supersymmetric models from the observed luminosity from Supernova 1987A. We find that for…