Results 21 to 30 of about 4,678 (262)
Grand unified theories in renormalisable, classically scale invariant gravity [PDF]
Journal of High Energy Physics, 2019 Abstract We analyze SO(N) and SU(N) gauge theories with scalars in adjoint and fundamental representations, coupled to renormalisable, classically scale invariant gravity. In the specific case of SO(11), we show that the quantum field theory can be can be asymptotically free in all couplings (hence ultra-violet complete).
Einhorn, Martin, Jones, D.R.
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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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Journal of High Energy Physics, 2021 Primordial perturbations in our universe are believed to have a quantum origin, and can be described by the wavefunction of the universe (or equivalently, cosmological correlators). It follows that these observables must carry the imprint of the founding
Scott Melville, Enrico Pajer
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Doomsdays in a modified theory of gravity: A classical and a quantum approach
Physics Letters B, 2017 By far cosmology is one of the most exciting subject to study, even more so with the current bulk of observations we have at hand. These observations might indicate different kinds of doomsdays, if dark energy follows certain patterns. Two of these doomsdays are the Little Rip (LR) and Little Sibling of the Big Rip (LSBR).
Imanol Albarran +3 more
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4D spin-2 fields from 5D Chern-Simons theory
Journal of High Energy Physics, 2018 We consider a 5-dimensional Chern-Simons gauge theory for the isometry group of Anti-de-Sitter spacetime, AdS4+1 ≃ SO(4, 2), and invoke different dimensional reduction schemes in order to relate it to 4-dimensional spin-2 theories.
N. L. González Albornoz +3 more
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Spin effects in the effective field theory approach to Post-Minkowskian conservative dynamics
Journal of High Energy Physics, 2021 Building upon the worldline effective field theory (EFT) formalism for spinning bodies developed for the Post-Newtonian regime, we generalize the EFT approach to Post-Minkowskian (PM) dynamics to include rotational degrees of freedom in a manifestly ...
Zhengwen Liu +2 more
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Causality bounds on scalar-tensor EFTs
Journal of High Energy Physics, 2023 We compute the causality/positivity bounds on the Wilson coefficients of scalar-tensor effective field theories. Two-sided bounds are obtained by extracting IR information from UV physics via dispersion relations of scattering amplitudes, making use of ...
Dong-Yu Hong +2 more
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Journal of High Energy Physics, 2020 We study a host of spacetimes where the Weyl curvature may be expressed algebraically in terms of an Abelian field strength. These include Type D spacetimes in four and higher dimensions which obey a simple quadratic relation between the field strength ...
Rashid Alawadhi +2 more
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Ghost free mimetic massive gravity
Journal of High Energy Physics, 2018 The mass of the graviton can be generated using a Brout-Englert-Higgs mechanism with four scalar fields. We show that when one of these fields is costrained as in mimetic gravity, the massive gravity obtained is ghost free and consistent.
Ali H. Chamseddine, Viatcheslav Mukhanov
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A new geometric flow on 3-manifolds: the K-flow
Journal of High Energy Physics, 2023 We define a new geometric flow, which we shall call the K-flow, on 3-dimensional Riemannian manifolds; and study the behavior of Thurston’s model geometries under this flow both analytically and numerically.
Kezban Tasseten, Bayram Tekin
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