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Gravitational scattering upto third post-Newtonian approximation for conservative dynamics: Scalar-Tensor theories
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abstract
We compute the scattering angle $\chi$ for hyperboliclike encounters in massless Scalar-Tensor (ST) theories up to third post-Newtonian (PN) order for the conservative part of the dynamics. To calculate the gauge-invariant scattering angle as a function of energy and orbital angular momentum, we use the approach of Effective-One-Body formalism as introduced in [Phys.Rev.D 96 (2017) 6, 064021]. We then compute the nonlocal-in-time contribution to the scattering angle by using the strategy of order-reduction of nonlocal dynamics introduced for small-eccentricity orbits.
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Cited by 1 Pith paper
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Quasi-Keplerian parametrization for compact binaries on hyperbolic orbits in scalar-tensor theories at second post-Newtonian order
A complete 2.5PN scattering angle for scalar-tensor hyperbolic binaries is derived from a new 2PN quasi-Keplerian parametrization, along with a corrected 3PN GR impact parameter.
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