Recursion in the classical limit and the neutron-star Compton amplitude
Journal of High Energy Physics, 2023 We study the compatibility of recursive techniques with the classical limit of scattering amplitudes through the construction of the classical Compton amplitude for general spinning compact objects.
Kays Haddad
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Scattering amplitudes, black holes and leading singularities in cubic theories of gravity [PDF]
Journal of High Energy Physics, 2019 We compute the semi-classical potential arising from a generic theory of cubic gravity, a higher derivative theory of spin-2 particles, in the framework of modern amplitude techniques.
William T. Emond, Nathan Moynihan
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The constraints of post-quantum classical gravity [PDF]
Journal of High Energy Physics, 2020 We study a class of theories in which space-time is treated classically, while interacting with quantum fields. These circumvent various no-go theorems and the pathologies of semi-classical gravity, by being linear in the density matrix and phase-space ...
J. Oppenheim, Zachary Weller-Davies
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Late time acceleration in Palatini gravity
Journal of High Energy Physics, 2022 We investigate the effect of the quadratic correction αR 2 and non-minimal coupling ξϕ 2 R on a quintessence model with an exponential potential V(ϕ) = M 4exp(−λϕ) in the Palatini formulation of gravity.
Ignatios Antoniadis +2 more
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Traversable Lorentzian wormholes in higher dimensional theories of gravity [PDF]
Journal of Physics: Conference Series, 2019 Wormhole solutions in classical general relativity are unstable and hence non traversable. Morris and Thorne discovered a traversable wormhole solution that required the energy momentum tensor of matter sources to violate various energy conditions and ...
Anshuman Baruah, A. Deshamukhya
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Brown-York charges at null boundaries
Journal of High Energy Physics, 2022 The Brown-York stress tensor provides a means for defining quasilocal gravitational charges in subregions bounded by a timelike hypersurface. We consider the generalization of this stress tensor to null hypersurfaces.
Venkatesa Chandrasekaran +3 more
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Canonical transformation path to gauge theories of gravity-II: Space-time coupling of spin-0 and spin-1 particle fields [PDF]
International Journal of Modern Physics E, 2017 The generic form of space-time dynamics as a classical gauge field theory has recently been derived, based on only the action principle and on the principle of general relativity.
J. Struckmeier +13 more
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Causality and superluminal behavior in classical field theories: Applications to k-essence theories and modified-Newtonian-dynamics-like theories of gravity [PDF]
, 2006 Field theories with Lorentz (or diffeomorphism invariant) action can exhibit superluminal behavior through the breaking of local Lorentz invariance. Quantum induced superluminal velocities are well-known examples of this effect.
Jean-Philippe Bruneton
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Effective field theories of post-Newtonian gravity: a comprehensive review [PDF]
Reports on progress in physics. Physical Society, 2018 This review article presents the progress made over the last decade, since the introduction of effective field theories (EFTs) into post-Newtonian (PN) gravity.
M. Levi
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Generating cosmological perturbations in non-singular Horndeski cosmologies
Journal of High Energy Physics, 2023 We construct a concrete model of Horndeski bounce with strong gravity in the past. Within this model we show that the correct spectra of cosmological perturbations may be generated at early contracting epoch, with mild fine-tuning ensuring that the ...
Yulia Ageeva +2 more
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