[1111.5661] Stochastic backgrounds in alternative theories of gravity: overlap reduction functions for pulsar timing arrays

Authors: Sydney J. Chamberlin, Xavier Siemens

Date: 24 Nov 2011

Abstract: In the next decade gravitational waves could be detected using a pulsar timing array. In an effort to develop optimal detection strategies for stochastic backgrounds of gravitational waves in generic metric theories of gravity, we investigate the overlap reduction functions for these theories and discuss their features. We show that sensitivity increases for non-transverse gravitational waves and discuss the physical origin of this effect. We calculate the overlap reduction functions for the current NANOGrav Pulsar Timing Array (PTA) and show that the sensitivity to the vector and scalar-longitudinal modes can increase dramatically for pulsar pairs with small angular separations. For example, the J1853-J1857 pulsar pair, with an angular separation of 3.47 degrees, is about 10ˆ4 times more sensitive to the longitudinal component of the stochastic background, if it's present, than the transverse components.

abs pdf

Nov 29, 2011

1111.5661 (/preprints)
2011-11-29, 04:46 [edit]


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