Journal article
Stochastic gravitational wave background from hydrodynamic turbulence in differentially rotating neutron stars
PD Lasky, MF Bennett, A Melatos
Physical Review D Particles Fields Gravitation and Cosmology | Published : 2013
Abstract
Hydrodynamic turbulence driven by crust-core differential rotation imposes a fundamental noise floor on gravitational wave observations of neutron stars. The gravitational wave emission peaks at the Kolmogorov decoherence frequency which, for reasonable values of the crust-core shear, ΔΩ, occurs near the most sensitive part of the frequency band for ground-based, long-baseline interferometers. We calculate the energy density spectrum of the stochastic gravitational wave background from a cosmological population of turbulent neutron stars generalizing previous calculations for individual sources. The spectrum resembles a piecewise power law, Ωgw(ν )=Ωανα, with α=-1 and 7 above and below the d..
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Grants
Awarded by Australian Research Council Discovery Project
Funding Acknowledgements
This work was supported through an Australian Research Council Discovery Project (DP110103347). P.D.L. was partially supported by a University of Melbourne Early Career Researcher grant. M.F.B. was supported by an Australian Postgraduate Award. We are grateful to Stuart Wyithe, Vikram Ravi, Eric Thrane and Nelson Christensen for valuable discussions about the Universe and Duncan Galloway about the neutron stars within it. We are also grateful to the anonymous referee for suggestions that improved the manuscript, and especially for pointing out that the l = 2, m not equal 2 modes contribute significantly to the gravitational wave emission.