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Testing gravity theories in the radiative regime using pulsar timing arrays

Published online by Cambridge University Press:  20 March 2013

K. J. Lee
K. J. Lee*
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn 53121, Germany email: [email protected]
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Abstract

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General relativity has predicted the existence of gravitational waves (GW), which are waves of the distortions of space-time with two degrees of polarization and the propagation speed of light. Alternative theories predict more polarizations, up to a maximum of six, and possible frequency dependent propagation speed from the light speed. The polarization and dispersion properties of GWs shed light on the spin and mass information of gravitons. Although GWs have not been directly detected yet, their amplitude upper-bounds has been addressed by research using different types of detectors. For example, the amplitude upper-bounds for the stochastic background derived from pulsar timing observations have already become astrophysically interesting. The present paper reviews proposals to test the gravity theories in the radiation regime by observing GWs using pulsar timing arrays. We also present the estimation for the upper-bounds on the amplitude of alternative modes for the stochastic background of GW.

Keywords

gravitational waves(stars:) pulsars: generalelementary particles
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 189 - 194
Copyright
Copyright © International Astronomical Union 2013

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