Fundo estocástico de ondas gravitacionais gerados por buracos negros pré-galáctiocs / Stochastic Background of Gravitational Waves Generated By pre-galactic Black Hole Formation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Observation of the Cosmic Microwave Background Radiation (CMB) provide us with a clear information about the status of matter and radiation at the decoupling era like a snapshot of the Universe 300.000 years after the Big-Bang. Nowadays, through observations of the cosmic structure, we can build-up the history of the Universe from one billion years after the Big-Bang until the present time. However, there is a period of the history of Universe, known as "Dark Ages , for which we have no observational data. On the other hand, the first gravitational wave detection will open a new astronomical window for observation of the Universe at high redshifts. The main objective of the present work is to use gravitational waves as a tool for the study of the Universe at high redshifts. To do that, we use a Press-Schechter like-formalism to study the cosmic star formation up to redshift 40. We study three specific cases for Zini (20, 30 and 40), and we follow the star formation history within the dark halos formed from the collapse of primordial density perturbations. In particular, we obtain Signal-to-Noise (S/N) ratios for the correlation of two LIGO s (Laser Interferometer Gravitational Wave Observatory) operating in the initial, enhanced and advanced configurations. We run several models changing the following parameters: exponent of the initial mass function, time scale for star formation, efficiency for gravitational wave produtcion. We find, for some models , (S/N) hicksim 0,7 for LIGO III configuration. This kind of result open a possibility to detect such a stochastic background adding a third (or fourth) interferometer to calculate the Signal-to-Noise rate $ (S/N).

ASSUNTO(S)

ondas gravitacionais astrofísica black holes buracos negros cosmologia galaxies gravitacional waves gravitation cosmology

ACESSO AO ARTIGO

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