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Quintessence with Coupled Scalar Fields
M. C. Bento, O. Bertolami, N. C. Santos
We discuss the dynamics of a quintessence model involving two coupled scalar fields. The model presents two types of solutions, namely solutions that correspond to eternal and tran…
Cosmological Bounds on an Invisibly Decaying Higgs Boson
O. Bertolami, M. C. Bento, R. Rosenfeld
We derive bounds on the Higgs boson coupling to a stable light scalar which is regarded as a collisional dark matter candidate. We study the behaviour of this scalar,…
N=1 Supergravity Chaotic Inflation in the Braneworld Scenario
M. C. Bento, O. Bertolami
We study a N=1 Supergravity chaotic inflationary model, in the context of the braneworld scenario. It is shown that successful inflation and reheating consistent with phenomenologi…
A Two-Field Quintessence Model
M. C. Bento, O. Bertolami, N. C. Santos
We study the dynamics of a quintessence model based on two interacting scalar fields. The model can account for the (recent) accelerated expansion of the Universe suggested by astr…
Cosmological Constraints on an Invisibly Decaying Higgs Boson
M. C. Bento, O. Bertolami, R. Rosenfeld
Working in the context of a proposal for collisional dark matter, we derive bounds on the Higgs boson coupling to a stable light scalar particle, which we refer to as…
Self-Interacting Scalar Dark Matter and Higgs Decay
M. C. Bento, O. Bertolami, R. Rosenfeld +1
Self-interacting dark matter has been suggested in order to overcome the difficulties of the Cold Dark Matter model on galactic scales. We argue that a scalar gauge singlet coupled…