Generation of gravitational waves in cosmological phase transition from quark-hadron / Geração de ondas gravitacionais na transição de fase cosmológica quark-hádron

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/10/2010

RESUMO

Gravitational waves are possibly the only direct evidence to study the Early Universe in times preceding the matter-radiation decoupling. The future launch of LISA (Laser Interferometer Space Antenna) will possibly provide a precise instrument for measuring this radiation. In this work we calculate the gravitational wave background produced by the quark-hadron phase transition approximately 1 microsecond after the Big Bang. To this end, we performe one-dimensional numerical simulations of the hydrodynamic evolution of the primordial uid and obtain the spectrum of gravitational waves generated by its motion. For the solution of the relativistic Euler equations, we use the conservative Godunov method with the Riemann solver of Roe. First, we consider that the transition is a crossover and obtain the gravitational signal produced by small perturbations in the plasma, employing an equation of state based on recent lattice QCD results. Then, we consider a rst order phase transition producing deagrations and detonations which in turn generate gravitational waves. Finally, the spectra of gravitational waves obtained from numerical simulations is compared with the LISA sensitivity curve.

ASSUNTO(S)

transição de fase ondas gravitacionais cosmologia phase transition gravitational waves cosmology fisica

ACESSO AO ARTIGO

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