Gravitational Wave Background from Neutrino-Driven Gamma-Ray Bursts

Abstract

We discuss the gravitational wave background (GWB) from a cosmological population of gamma-ray bursts (GRBs). Among various emission mechanisms for the gravitational waves (GWs), we pay a particular attention to the vast anisotropic neutrino emissions from the accretion disk around the black hole formed after the so-called failed supernova explosions. The produced GWs by such mechanism are known as burst with memory, which could dominate over the low-frequency regime below \sim 10Hz. To estimate their amplitudes, we derive general analytic formulae for gravitational waveform from the axisymmetric jets. Based on the formulae, we first quantify the spectrum of GWs from a single GRB. Then, summing up its cosmological population, we find that the resultant value of the density parameter becomes roughly Ω_{GW} \approx 10^{-20} over the wide-band of the low-frequency region, f\sim 10^{-4}-10^1Hz. The amplitude of GWB is sufficiently smaller than the primordial GWBs originated from an inflationary epoch and far below the detection limit.

6 pages, 4 figures, accepted for publication in MNRAS

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• Formation of black hole and accretion disk in a massive high-entropy stellar core collapse
• Multimessengers from core-collapse supernovae: multidimensionality as a key to bridge theory and observation
• Probing the central engine of long gamma-ray bursts and hypernovae with gravitational waves and neutrinos
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• Gravitational Wave Memory from Gamma Ray Bursts' Jets
• Neutrino Pair Annihilation in Collapsars; Ray-Tracing Method in Special Relativity
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