0000000000347687

AUTHOR

M. B. Gavela

showing 3 related works from this author

Dark coupling and gauge invariance

2010

We study a coupled dark energy–dark matter model in which the energymomentum exchange is proportional to the Hubble expansion rate. The inclusion of its perturbation is required by gauge invariance. We derive the linear perturbation equations for the gauge invariant energy density contrast and velocity of the coupled fluids, and we determine the initial conditions. The latter turn out to be adiabatic for dark energy, when assuming adiabatic initial conditions for all the standard fluids. We perform a full Monte Carlo Markov Chain likelihood analysis of the model, using WMAP 7-year data.

AstrofísicaAstrophysics and AstronomyCosmology and Nongalactic Astrophysics (astro-ph.CO)Monte Carlo methodFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesCosmologysymbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesCosmological perturbation theoryGauge theoryAdiabatic process010303 astronomy & astrophysicsPhysics010308 nuclear & particles physicsFísicaAstronomy and AstrophysicsMarkov chain Monte CarloHigh Energy Physics - PhenomenologyQuantum electrodynamicssymbolsDark energyHubble's lawAstrophysics - Cosmology and Nongalactic Astrophysics
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Dark coupling

2009

30 pages, 10 figures, 3 tables.-- Pre-print archive.

AstrofísicaPhysicsCouplingCosmology and Nongalactic Astrophysics (astro-ph.CO)COSMIC cancer databasemedia_common.quotation_subjectFOS: Physical sciencesPerturbation (astronomy)Astronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsCosmology of Theories beyond the SMCurvatureCMB cold spotCosmological perturbation theoryUniverseHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Dark energy theoryDark energyNeutrinoAstrophysics - Cosmology and Nongalactic Astrophysicsmedia_commonJournal of Cosmology and Astroparticle Physics
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Summary of golden measurements at a ν-factory

2000

The precision and discovery potential of a neutrino factory based on muon storage rings is summarized. For three-family neutrino oscillations, we analyze how to measure or severely constraint the angle $\theta_{13}$, CP violation, MSW effects and the sign of the atmospheric mass difference $\Delta m^2_{23}$. The appearance of ``wrong-sign muons'' at three reference baselines is considered: 732 km, 3500 km and 7332 km. We exploit the dependence of the signal on the neutrino energy, and include as well realistic background estimations and detection efficiencies. The optimal baseline turns out to be $O$(3000 km).

PhysicsNuclear and High Energy PhysicsParticle physicsMuonPhysics::Instrumentation and DetectorsHigh Energy Physics::PhenomenologyMeasure (mathematics)High Energy Physics - PhenomenologyCP violationFísica nuclearHigh Energy Physics::ExperimentNeutrino FactoryNeutrinoNeutrino oscillationInstrumentationEnergy (signal processing)Sign (mathematics)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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