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Supersymmetric backgrounds in (1 + 1) dimensions and inhomogeneous field theory
Journal of High Energy Physics, 2023 We find a (1 + 1)-dimensional metric solution for a background hosting various supersymmetric field theories with a single non-chiral real supercharge. This supersymmetric background is globally hyperbolic even though it contains a naked null singularity.
Jeongwon Ho +3 more
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Superluminality in DHOST theory with extra scalar
Journal of High Energy Physics, 2021 We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rolling ...
S. Mironov, V. Rubakov, V. Volkova
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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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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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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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Conformal wave expansions for flat space amplitudes
Journal of High Energy Physics, 2021 The extended BMS algebra contains a conformal subgroup that acts on the celestial sphere as SO(1, 3). It is of interest to perform mode expansions of free fields in Minkowski spacetime that realize this symmetry in a simple way.
Chang Liu, David A. Lowe
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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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Journal of High Energy Physics, 2023 It has recently been argued that half degrees of freedom could emerge in Lorentz and parity invariant field theories, using a non-linear Proca field theory dubbed Proca-Nuevo as a specific example.
Claudia de Rham +4 more
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Is Gravity Actually the Curvature of Spacetime? [PDF]
, 2019 The Einstein equations, apart from being the classical field equations of General Relativity, are also the classical field equations of two other theories of gravity.
Bahamonde, Sebastian, Faizal, Mir
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Journal of High Energy Physics, 2020 A massive, nonrelativistic scalar field in an expanding spacetime is usually approximated by a pressureless perfect fluid, which leads to the standard conclusion that such a field can play the role of cold dark matter.
Borna Salehian +2 more
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