Results 31 to 40 of about 178,359 (292)

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, D. Lüst, S. Salgado, A. Schmidt-May   +3 more
doaj   +1 more source

Cosmological Cutting Rules

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
doaj   +1 more source

Quantum Histories and Quantum Gravity

, 2009
This paper reviews the histories approach to quantum mechanics. This discussion is then applied to theories of quantum gravity. It is argued that some of the quantum histories must approximate (in a suitable sense) to classical histories, if the correct ...
A W J, Ambjorn J, Ambjorn J, Ambjorn J, Amelino-Camelia G, Amelino-Camelia G, Ballentine L E, Barcelo C, Bell J, Bohr N, Bombelli L, Collins J, Doring A, Dowker F, Dreyer O, Dreyer O, Feynman R P, Girelli F, Hardy L, Hartle J B, Henson J, Joe Henson, Kent A, Khoury J, Kofler J, Konopka T, Konopka T, Kribs D W, Livine E R, Markopoulou F, Markopoulou F, Markopoulou F, Markopoulou F, Meyer D, Myrheim J, Oriti D, Peres A, Perez A, Sahlmann H, Sahlmann H, Schlosshauer M, Sorkin R D, Visser M, Volovik G, Weinfurtner S, Wiebe N, Williams R M, Zinn-Justin J   +47 more
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Classical Gauge Theory of Gravity

Theoretical and Mathematical Physics, 2002
The classical theory of gravity is formulated as a gauge theory on a frame bundle with spontaneous symmetry breaking caused by the existence of Dirac fermionic fields. The pseudo-Riemannian metric (tetrad field) is the corresponding Higgs field. We consider two variants of this theory.
openaire   +3 more sources

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, Rafael A. Porto, Zixin Yang   +2 more
doaj   +1 more source

Graviton-photon oscillation in alternative theories of gravity [PDF]

, 2018
In this paper we investigate graviton-photon oscillation in the presence of an external magnetic field in alternative theories of gravity. Whereas the effect of an effective refractive index for the electromagnetic radiation was already considered in the
Cembranos, Jose A. R., Diaz, Mario Coma, Martin-Moruno, Prado   +2 more
core   +3 more sources

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
doaj   +1 more source

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, Zhuo-Hui Wang, Shuang-Yong Zhou   +2 more
doaj   +1 more source

Gravity duals for logarithmic conformal field theories

, 2010
Logarithmic conformal field theories with vanishing central charge describe systems with quenched disorder, percolation or dilute self-avoiding polymers. In these theories the energy momentum tensor acquires a logarithmic partner. In this talk we address
Afshar H R, Andrade T, Anninos D, Anninos D, Anninos D, Becker M, Bernard D, Blagojevic M, Blagojevic M, Cardy J L, Carlip S, Carlip S, Carlip S, Chow D D K, Compere G, Compere G, Daniel Grumiller, de Haro S, Deser S, Deser S, Deser S, Di Francesco P, Duncan J F, Ertl S, Fujita M, Gaberdiel M R, Gaiotto D, Gibbons G W, Giribet G, Grumiller D, Grumiller D, Grumiller D, Grumiller D, Gurarie V, Hellerman S, Hotta K, Hotta K, Kogan I I, Kraus P, Lee H W, Li W, Li W, Liu Y, Maloney A, Maloney A, Manschot J, Manschot J, Miskovic O, Myers R C, Myung Y S, Myung Y S, Nam S, Niklas Johansson, Oh J J, Park M I, Sachs I, Sachs I, Sezgin E, Skenderis K, Skenderis K, Stevens K A, Strominger A, Vasquez Y, Witten E, Yin X, Yin X, Zee A   +66 more
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Singularity-free classical theory of gravity

Physical Review D
We present a classical theory of gravity, which is singularity free at short distances and reduces to General Relativity at large distances. We discuss its implications.
Saurya Das, Mitja Fridman, Sourav Sur
openaire   +2 more sources