Gravitational Wave Memory from Accelerating Relativistic Jets in Multiple Thick Shell Scenarios

TL;DR

This paper investigates gravitational wave memory effects from accelerating relativistic jets in gamma-ray bursts, comparing different shell scenarios and assessing detectability with future GW detectors.

Contribution

It introduces a comprehensive analysis of GW memory from multiple shell scenarios, highlighting the importance of broad-band observations for detection.

Findings

GW memory signals are potentially detectable by DECIGO and ET-D.

Memory spectra vary across different shell configurations.

Simulations show realistic nearby scenarios produce observable GW memory.

Abstract

Gravitational wave (GW) memory, a permanent distortion of the space-time metric, is anticipated during the acceleration of relativistic jets in gamma-ray bursts (GRBs). While the precise mechanism behind GRBs is not yet fully understood, detecting GW memory may contribute to clarifying their nature. In this paper, we consider various scenarios of GW memory emission, including both single and multiple shells with thin- and thick-shells. In particular, the memory spectrum for each scenario is compared with the sensitivity of next-generation detectors, namely DECIGO and ET-D. Physical properties spread over a broad-band region, emphasizing the importance of combined and wide-band observations. We also simulate GW memory based on nearby, realistic scenarios and demonstrate its detectability.