Conservative Dynamics of Relativistic Binaries Beyond Einstein Gravity
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909734583402496 |
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| author | Wilson-Gerow, Jordan |
| author_facet | Wilson-Gerow, Jordan |
| contents | We study the conservative dynamics of spinless compact objects in a general effective theory of gravity which includes a metric and an arbitrary number of scalar fields, through $\mathcal{O}(G^{3})$. Departures from Einstein gravity, which preserve general coordinate and local Lorentz invariance, are characterized by higher-derivative terms in a Lagrangian whose coupling constants scale as powers of a ``new-physics'' length scale, $\ell$. For a purely metric theory we compute the contributions from the the leading and subleading higher-curvature curvature corrections. In four dimensions these are cubic and quartic curvature terms, i.e. orders $\ell^4$ and $\ell^6$. We also study a general multi-scalar-tensor theory of gravity to order $\ell^{4}$, which includes both Einstein-dilaton-Gauss-Bonnet (EdGB) and dynamical Chern-Simons (dCS) higher-order couplings. Specifically, we compute the radial action in a post-Minkowskian approximation for scattering orbits, to two-loop order. The result encodes the fully relativistic dynamics of the compact objects, and serves as a generating function for gauge-invariant orbital observables for both bound and unbound binary systems. Where overlapping post-Newtonian results are available, we've verified agreement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02867 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Conservative Dynamics of Relativistic Binaries Beyond Einstein Gravity Wilson-Gerow, Jordan High Energy Physics - Theory General Relativity and Quantum Cosmology We study the conservative dynamics of spinless compact objects in a general effective theory of gravity which includes a metric and an arbitrary number of scalar fields, through $\mathcal{O}(G^{3})$. Departures from Einstein gravity, which preserve general coordinate and local Lorentz invariance, are characterized by higher-derivative terms in a Lagrangian whose coupling constants scale as powers of a ``new-physics'' length scale, $\ell$. For a purely metric theory we compute the contributions from the the leading and subleading higher-curvature curvature corrections. In four dimensions these are cubic and quartic curvature terms, i.e. orders $\ell^4$ and $\ell^6$. We also study a general multi-scalar-tensor theory of gravity to order $\ell^{4}$, which includes both Einstein-dilaton-Gauss-Bonnet (EdGB) and dynamical Chern-Simons (dCS) higher-order couplings. Specifically, we compute the radial action in a post-Minkowskian approximation for scattering orbits, to two-loop order. The result encodes the fully relativistic dynamics of the compact objects, and serves as a generating function for gauge-invariant orbital observables for both bound and unbound binary systems. Where overlapping post-Newtonian results are available, we've verified agreement. |
| title | Conservative Dynamics of Relativistic Binaries Beyond Einstein Gravity |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2503.02867 |