R-modes of accreting hyperon stars as persistent sources of gravitational waves
- Institute for Gravitational Physics and Geometry and Center for Gravitational Wave Physics, Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300 (United States)
The r-modes of accreting neutron stars could be a detectable source of persistent gravitational waves if the bulk viscosity of the stellar matter can prevent a thermal runaway. This is possible if exotic particles such as hyperons are present in the core of the star. We compute bulk viscous damping rates and critical frequencies for r-modes of neutron stars containing hyperons in the framework of relativistic mean field theory. We combine the results of several previous calculations of the microphysics, include for the first time the effect of rotation, and explore the effects of various parameters on the viability of persistent gravitational wave emission. We find that persistent emission is quite robust, although it is disfavored in stars below 1.3-1.5 M{sub {center_dot}} depending on the equation of state. In some cases persistent emission is compatible with temperatures as low as 10{sup 7} K, observed in some accreting neutron stars in quiescence.
- OSTI ID:
- 20782900
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 8; Other Information: DOI: 10.1103/PhysRevD.73.084001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORIOLIS FORCE
COSMOLOGY
CRITICAL FREQUENCY
DAMPING
EMISSION
EQUATIONS OF STATE
FLUID MECHANICS
GRAVITATIONAL WAVES
HYPERONS
MEAN-FIELD THEORY
NEUTRON STARS
NUCLEAR MATTER
RELATIVISTIC RANGE
ROTATION
VISCOSITY