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Superradiance in the sky
Joao G. Rosa
We discuss the conditions under which plane electromagnetic and gravitational waves can be amplified by a rotating black hole due to superradiant scattering. We show, in particular…
The role of fluctuation-dissipation dynamics in setting initial conditions for inflation
Mar Bastero-Gil, Arjun Berera, Robert Brandenberger +3
We study the problem of initial conditions for slow-roll inflation along a plateau-like scalar potential within the framework of fluctuation-dissipation dynamics. We consider, in p…
Inflation in non-minimal matter-curvature coupling theories
Cláudio Gomes, João G. Rosa, Orfeu Bertolami
We study inflationary scenarios driven by a scalar field in the presence of a non-minimal coupling between matter and curvature. We show that the Friedmann equation can be signific…
Warm Little Inflaton
Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos +1
We show that inflation can naturally occur at a finite temperature T>H that is sustained by dissipative effects, when the inflaton field corresponds to a pseudo Nambu-Goldstone bos…
Scalar field dark matter and the Higgs field
Orfeu Bertolami, Catarina Cosme, João G. Rosa
We discuss the possibility that dark matter corresponds to an oscillating scalar field coupled to the Higgs boson. We argue that the initial field amplitude should generically be o…