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Scientific article
English

Extracting the three- and four-graviton vertices from binary pulsars and coalescing binaries

Contributors

Cannella, Umberto; Foffa, Stefano; Maggiore, Michele; Sanctuary, Hillary Adrienne; Sturani, Riccardo

Published in

Physical review. D. Particles, fields, gravitation, and cosmology, vol. 80, no. 12

Publication date

2009

Abstract

Using a formulation of the post-Newtonian expansion in terms of Feynman graphs, we discuss how various tests of general relativity (GR) can be translated into measurement of the three- and four-graviton vertices. In problems involving only the conservative dynamics of a system, a deviation of the three-graviton vertex from the GR prediction is equivalent, to lowest order, to the introduction of the parameter βPPN in the parametrized post-Newtonian formalism, and its strongest bound comes from lunar laser ranging, which measures it at the 0.02% level. Deviation of the three-graviton vertex from the GR prediction, however, also affects the radiative sector of the theory. We show that the timing of the Hulse-Taylor binary pulsar provides a bound on the deviation of the three-graviton vertex from the GR prediction at the 0.1% level. For coalescing binaries at interferometers we find that, because of degeneracies with other parameters in the template such as mass and spin, the effects of modified three- and four-graviton vertices is just to induce an error in the determination of these parameters and, at least in the restricted PN approximation, it is not possible to use coalescing binaries for constraining deviations of the vertices from the GR prediction

UNIGE affiliation entities

Citation (ISO format)

CANNELLA, Umberto et al. Extracting the three- and four-graviton vertices from binary pulsars and coalescing binaries. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2009, vol. 80, n° 12. doi: 10.1103/PhysRevD.80.124035

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Article (Published version)

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Journal ISSN

1550-2368
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