Testing scalartensor gravity using space gravitationalwave interferometers
Abstract
We calculate the bounds which could be placed on scalartensor theories of gravity of the Jordan, Fierz, Brans and Dicke type by measurements of gravitational waveforms from neutron stars (NS) spiraling into massive black holes (MBH) using LISA, the proposed space laser interferometric observatory. Such observations may yield significantly more stringent bounds on the BransDicke coupling parameter ω than are achievable from solar system or binary pulsar measurements. For NSMBH inspirals, dipole gravitational radiation modifies the inspiral and generates an additional contribution to the phase evolution of the emitted gravitational waveform. Bounds on ω can therefore be found by using the technique of matched filtering. We compute the Fisher information matrix for a waveform accurate to second postNewtonian order, including the effect of dipole radiation, filtered using a currently modeled noise curve for LISA, and determine the bounds on ω for several different NSMBH canonical systems. For example, observations of a 1.4M_{solar} NS inspiraling to a 10^{3}M_{solar} MBH with a signaltonoise ratio of 10 could yield a bound of ω>240 000, substantialy greater than the current experimental bound of ω>3000.
 Publication:

Physical Review D
 Pub Date:
 February 2002
 DOI:
 10.1103/PhysRevD.65.042002
 arXiv:
 arXiv:grqc/0109044
 Bibcode:
 2002PhRvD..65d2002S
 Keywords:

 04.80.Cc;
 04.30.Db;
 04.50.+h;
 Experimental tests of gravitational theories;
 Wave generation and sources;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity;
 General Relativity and Quantum Cosmology
 EPrint:
 18 pages, 4 figures, 1 table