INVESTIGADORES
SCOCCOLA Claudia Graciela
congresos y reuniones científicas
Título:
Cosmological parameters and non-vacuum initial states
Autor/es:
SCÓCCOLA, C.; SÁNCHEZ, A.; LANDAU, S.; GANGUI, A.
Lugar:
Malargüe
Reunión:
Congreso; 50ava Reunion Anual de la Asociacion Argentina de Astronomia; 2007
Resumen:
A class of spatially flat models with a cosmological constant and a
primordial broken scale invariant (BSI) spectrum of adiabatic
perturbations is confronted with the most up-to-date observational data
of CMB and matter power spectrum. The theoretical model includes a
parameter n_b for the number of quanta in the non-vacuum initial state,
and a privileged scale leading to the existence of a feature in the
primordial power spectrum. This feature is located at comoving
wavenumber k_b and its profile is characterized by a step in k with
steepness alpha, the full set {n_b, k_b, alpha} being taken as free
parameters in our numerical study. We present here preliminary results
of a detailed Markov Chain Monte Carlo analysis with CAMB and CosmoMC of
the latest CMB and P(k) measurements, including the 3-year WMAP and the
final 2dFGRS catalogue, where we derive joint constraints on eight out
of the many relevant primary parameters -both cosmological and feature-
of our BSI adiabatic model.