Instituto de Física y Astronomía

y Centro de Astrofísica de Valparaíso

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Título: Brane with variable tension as source of the late cosmic accelertion

Jueves, 14. Junio 2018, 14:30
Accesos : 94

Charlista: Dr. Juan Magaña 

Institución: Instituto de física y Astronomía, Universidad de Valparaíso

Ciudad/País: Valparaíso, Chile.

Braneworld models have been proposed as a possible solution to the problem of the accelerated expansion of the Universe. The idea is to dispense the dark energy (DE) and drive the late-time cosmic acceleration with a five-dimensional geometry. In this talk, I present a brane model with variable brane tension as a function of redshift dubbed chrono-brane. The ansatz is a polynomial function lambda=(1+z)^n inspired in tracker-scalar-field potentials. To constrain the 'n' exponent. We use the latest observational Hubble data from cosmic chronometers, Type Ia Supernovae from the full joint-light-analysis sample, baryon acoustic oscillations and the posterior distance from the cosmic microwave background of Planck 2015 measurements. A joint analysis of these data estimates n~6.19 which generates a DE-like (cosmological-constant like at late times) term, in the Friedmann equation arising from the extra dimensions. This model is consistent with these data and can drive the Universe to an accelerated phase at late times.

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