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Gravitational waves from gaps of neutron stars

Akira Dohi, Asuka Ito, Shota Kisaka

Abstract

The pulsar magnetosphere is a potential source of continuous gravitational waves due to the rapid charge-discharge process in short timescale, varying the electric-field energy density. We estimate the strain of the continuous gravitational waves, considering relativistic effects and different gap regions. We find that the strain from the polar cap is too small, in contrast to previous results. On the other hand, the strain from the outer gap is as large as $\sim2\times10^{-24}$, enough for future gravitational-wave detection such as the Einstein Telescope. Our result presents a new approach for the future detection of gravitational waves to probe the physics in the magnetosphere.

Gravitational waves from gaps of neutron stars

Abstract

The pulsar magnetosphere is a potential source of continuous gravitational waves due to the rapid charge-discharge process in short timescale, varying the electric-field energy density. We estimate the strain of the continuous gravitational waves, considering relativistic effects and different gap regions. We find that the strain from the polar cap is too small, in contrast to previous results. On the other hand, the strain from the outer gap is as large as , enough for future gravitational-wave detection such as the Einstein Telescope. Our result presents a new approach for the future detection of gravitational waves to probe the physics in the magnetosphere.

Paper Structure

This paper contains 6 sections, 16 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Gravitational wave generation from a gap
  3. Gap configurations
  4. Polar gaps
  5. Gaps in outer region of magnetosphere
  6. Discussion

Figures (1)

  • Figure 1: The gravitational wave amplitude $h_0$ from the outer gap region is shown. The black line represents $h_0$ calculated from Eq. (\ref{['h03']}) with $\kappa$ varied from $2$ to $100$. The blue, green, and red curves show the sensitivities of the combined LIGO O2 and O3 runs LIGOScientific:2021hvc, the combined LIGO O4 and future O5 runs Riles:2022wwz, and the Einstein Telescope Riles:2022wwz, respectively.