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Article
Report number arXiv:2212.03098 ; CERN-TH-2022-207
Title Stringent Pulsar Timing Bounds on Light Scalar Couplings to Matter
Author(s) Benisty, David (Cambridge U., DAMTP ; Cambridge U., KICC) ; Brax, Philippe (IPhT, Saclay ; CERN) ; Davis, Anne-Christine (Cambridge U., DAMTP ; Cambridge U., KICC)
Publication 2023-03-15
Imprint 2022-12-06
Number of pages 22
Note 17 pages, 9 figures, Accepted in Phys. Rev. D
In: Phys. Rev. D 107 (2023) 064049
DOI 10.1103/PhysRevD.107.064049 (publication)
Subject category hep-th ; Particle Physics - Theory ; hep-ph ; Particle Physics - Phenomenology ; astro-ph.SR ; Astrophysics and Astronomy ; astro-ph.HE ; Astrophysics and Astronomy ; gr-qc ; General Relativity and Cosmology
Abstract Pulsar Timing constraints on scalar-tensor theories with conformal and disformal couplings to matter are discussed. Reducing the dynamics to the motion in the centre of mass frame and using the mean anomaly parametrisation, we find the first post-Newtonian corrections induced by the conformal and disformal interactions in the form of a generalized quasi-Keplerian solution. We also derive the radiation reaction force due to scalar radiation and the corresponding Post-Keplerian Parameters (PKP). We use different pulsar time of arrival (TOA) data sets to probe the scalar corrections to the PKP. In particular, we focus on systems with large orbital frequencies as the contributions to the PKP terms induced by the disformal coupling are sensitive to higher frequencies. We find that the most constraining {{pulsar timings}} are PSR B1913+16 and the double pulsar PSR J0737-3039A/B, being {{of the order of}} the Cassini bound on the conformal coupling obtained from the Shapiro effect in the solar system. {{The combined constraints using other pulsar timings give an upper bound on the conformal coupling β2<2.33105 and a lower bound on the disformal coupling scale of Λ1.12 MeV which is comparable to the Cassini bound and to the GW-170817 constraints respectively}}. Future measurements for pulsar timing with black hole companions are also discussed.
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publication: © 2023-2024 authors (License: CC BY 4.0)



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 Record created 2023-01-26, last modified 2024-09-27


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