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Search: authors:"O. Bertolami"

8 papers found.
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Scale-invariant scalar field dark matter through the Higgs portal

] K. Kainulainen et al., Isocurvature Constraints on Portal Couplings, JCAP 06 (2016) 022 [arXiv:1601.07733] [INSPIRE]. Lett. B 759 (2016) 1 [arXiv:1603.06242] [INSPIRE]. [18] O. Bertolami, C. Cosme ... , Higgs- eld portal into hidden sectors , hep-ph/0605188 [INSPIRE]. [2] M.C. Bento , O. Bertolami , R. Rosenfeld and L. Teodoro , Sel nteracting dark matter and invisibly decaying Higgs , Phys. Rev. D 62

Gamma-ray bursts and dark energy–dark matter interaction

In this work, gamma-ray burst (GRB) data are used to place constraints on a putative coupling between dark energy and dark matter. Type Ia supernovae constraints from the Sloan Digital Sky Survey II (SDSS-II) first-year results, the cosmic microwave background radiation shift parameter from Wilkinson Microwave Anisotropy Probe seven year results and the baryon acoustic...

Odyssey: a solar system mission

The Solar System Odyssey mission uses modern-day high-precision experimental techniques to test the laws of fundamental physics which determine dynamics in the solar system. It could lead to major discoveries by using demonstrated technologies and could be flown within the Cosmic Vision time frame. The mission proposes to perform a set of precision gravitation experiments from...

Quantum physics exploring gravity in the outer solar system: the SAGAS project

We summarise the scientific and technological aspects of the Search for Anomalous Gravitation using Atomic Sensors (SAGAS) project, submitted to ESA in June 2007 in response to the Cosmic Vision 2015–2025 call for proposals. The proposed mission aims at flying highly sensitive atomic sensors (optical clock, cold atom accelerometer, optical link) on a Solar System escape...

Gamma-ray bursts as dark energy-matter probes in the context of the generalized Chaplygin gas model

In this paper we consider the use of gamma-ray bursts (GRBs) as distance markers to study the unification of dark energy and dark matter in the context of the so-called generalized Chaplygin gas (GCG) model. We consider that the GRB luminosity may be estimated from its variability and time-lag, and we also use the so-called Ghirlanda relation. We evaluate the improvements...

Latest supernova data in the framework of the generalized Chaplygin gas model

We use the most recent Type Ia supernova data in order to study the dark energy–dark matter (XCDM) unification approach in the context of the generalized Chaplygin gas (GCG) model. Rather surprisingly, we find that data allow models with α > 1. We have studied how the GCG adjusts flat and non-flat models, and our results show that GCG is consistent with a flat case up to 68 per...