Gravitation and Electromagnetism

Gupta, Suraj N.

doi:10.1103/physrev.96.1683

Cited by 286 publications

(239 citation statements)

References 8 publications

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“…Moreover, it was found that k μν must satisfy Gupta's equations defined in the embedded space-time (instead of Minkowski's space-time as in the original theorem of Gupta), motivated by the lack of uniqueness of the function b(t). A theorem due to Suraj Gupta [48] tells that any rank-2 tensor necessarily satisfies an Einstein-like system of equations, with the study of a linear massless spin-2 fields in Minkowski space-time by the Pauli-Fierz equation [49,50] as being its linear approximation. Such a spin-2 field was proposed by Salam et al [51] under the designation of strong gravity, acting as an intermediate field in the interaction between gravitation and hadrons.…”

Section: Embedded Smooth Universe In a Nutshellmentioning

confidence: 99%

Evolution of Density Parameters on a Smooth Embedded Universe

Capistrano

2017

Annalen der Physik

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In this paper we examine the evolution of cosmic density parameters in a four-dimensional space-time embedded in a five-dimensional bulk space. We show that the extrinsic curvature is an independent spin-2 field governed by the Gupta equations. Without evoking a dark energy fluid, the corresponding cosmological model is compared with the phenomenological XCDM model and shows a good concordance with recent cosmological datasets from Planck Collaboration and the latest Baryons Acoustic Oscillations/Cosmic Microwave Background (BAO/CMBR) + SNIa studying the evolution of density parameters. In addition, a discussion on the coincidence problem is also proposed.

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Section: Embedded Smooth Universe In a Nutshellmentioning

confidence: 99%

Evolution of Density Parameters on a Smooth Embedded Universe

Capistrano

2017

Annalen der Physik

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“…The possible existence of a quantum field theoretical framework for general relativity valid at all energy scales is clearly a fundamental question, and since the original formulation of quantum field theory, a technique by which general relativity and quantum mechanics can be combined has been sought [1][2][3][4][5][6][7]. Though such a theory has yet to be found, today we can address profound practical and reliable (low energy) consequences of the (currently unknown) underlying quantum theory through the modern viewpoint of effective field theory (EFT) [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Light-like scattering in quantum gravity

Bjerrum-Bohr

Donoghue

Holstein

et al. 2016

J. High Energ. Phys.

116

167

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We consider scattering in quantum gravity and derive long-range classical and quantum contributions to the scattering of light-like bosons and fermions (spin-0, spin-1 2 , spin-1) from an external massive scalar field, such as the Sun or a black hole. This is achieved by treating general relativity as an effective field theory and identifying the non-analytic pieces of the one-loop gravitational scattering amplitude. It is emphasized throughout the paper how modern amplitude techniques, involving spinor-helicity variables, unitarity, and squaring relations in gravity enable much simplified computations. We directly verify, as predicted by general relativity, that all classical effects in our computation are universal (in the context of matter type and statistics). Using an eikonal procedure we confirm the post-Newtonian general relativity correction for light-like bending around large stellar objects. We also comment on treating effects from quantum dependent terms using the same eikonal method.

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“…Theories involving one or several spin-two fields have raised a constant interest over the last thirty years, especially at the level of direct or intermediated graviton interactions [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. In this context more results on the impossibility of consistent cross-couplings among different gravitons have been obtained, either without other fields [14] or in the presence of a scalar field [14], a Dirac spinor [15], or respectively of a massive Rarita-Schwinger field [16].…”

Section: Introductionmentioning

confidence: 99%

Interactions for a collection of spin-two fields intermediated by a massless p-form

et al. 2008

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Under the general hypotheses of locality, smoothness of interactions in the coupling constant, Poincaré invariance, Lorentz covariance, and preservation of the number of derivatives on each field, we investigate the cross-couplings of one or several spin-two fields to a massless p-form. Two complementary cases arise. The first case is related to the standard interactions from General Relativity, but the second case describes a new, special type of couplings in D = p + 2 spacetime dimensions, which break the PT-invariance. Nevertheless, no consistent, indirect cross-interactions among different gravitons with a positively defined metric in internal space can be constructed.

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Gravitation and Electromagnetism

Cited by 286 publications

References 8 publications

Evolution of Density Parameters on a Smooth Embedded Universe

Evolution of Density Parameters on a Smooth Embedded Universe

Light-like scattering in quantum gravity

Interactions for a collection of spin-two fields intermediated by a massless p-form

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