The Behaviour of Effective Coupling Constants in “Finite” Grand Unification Theories in Curved Space-Time with Torsion

Buchbinder, I. L.; Odintsov, Sergei D.

doi:10.1209/0295-5075/8/7/002

Cited by 19 publications

(16 citation statements)

References 35 publications

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“…The more general form of induced gravity action can be considered [10,11], but we restrict the couplings to be conformal. In the limit of ξ → 1 6 , this extended conformal coupling is reduced to the ordinary conformal coupling in Riemann space decoupled from the vector torsion.…”

Section: Conformal Couplings In Induced Gravitymentioning

confidence: 99%

Conformally coupled induced gravity with gradient torsion

Yoon

1999

Phys. Rev. D

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We have found that the conformally coupled induced gravity can be an infrared fixed point of induced gravity with Yukawa couplings with matter. The late time cosmology with a uniform mean matter distribution can be described by the conformally coupled induced gravity, which has an emergent global conformal symmetry in the cosmic scale. Aiming to resolve the puzzles for the dark energy, we have obtained exact cosmological equations and determined the dark energy density, the matter density, and the jerk parameter in the present universe based on the recent observational cosmic expansion data for a/H 2 .

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Section: Conformal Couplings In Induced Gravitymentioning

confidence: 99%

Conformally coupled induced gravity with gradient torsion

Yoon

1999

Phys. Rev. D

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“…The purpose of [13] is the investigation of the trace anomaly-induced dynamics of the conformal factor in four-dimensional quantum gravity. In [14] grand unification theories in curved spacetime with torsion are investigated. It is shown that in a strong gravitational field these effective coupling constants tend to conformal values or increase in an exponential way.…”

Section: Perturbative Calculations With Fluctuating Torsionmentioning

confidence: 99%

Cosmological constant and Euclidean space from nonperturbative quantum torsion

Dzhunushaliev

2014

Int. J. Geom. Methods Mod. Phys.

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Heisenberg's nonperturbative quantization technique is applied to the nonperturbative quantization of gravity. An infinite set of equations for all Green's functions is obtained. An approximation is considered where: (a) the metric remains as a classical field; (b) the affine connection can be decomposed into classical and quantum parts; (c) the classical part of the affine connection is the Christoffel symbols; (d) the quantum part is the torsion. Using a scalar and vector fields approximation it is shown that nonperturbative quantum effects give rise to a cosmological constant and an Euclidean solution.

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“…Theories with torsion also attract attention since torsion naturally arises in many approaches such as supergravity [17][18][19] and superstring [20][21][22] theories. One of the simplest extensions of the ECT is f (R) gravity with torsion [23,24], and, as shown in [24], torsion can play the role of DE and cause an accelerated expansion of the Universe.…”

Section: Introductionmentioning

confidence: 99%

Wormholes and black universes without phantom fields in Einstein-Cartan theory

Бронников¹,

Galiakhmetov²

2016

Phys. Rev. D

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We obtain a family of regular static, spherically symmetric solutions in Einstein-Cartan theory with an electromagnetic field and a nonminimally coupled scalar field with the correct sign of kinetic energy density. At different values of its parameters, the solution, being asymptotically flat at large values of the radial coordinate, describes (i) twice asymptotically flat symmetric wormholes, (ii) asymmetric wormholes with an AdS asymptotic at the "far end", (iii) regular black holes with an extremal horizon or two simple horizons, and (iv) black universes with a de Sitter asymptotic at the "far end". As in other black universe models, it is a black hole as seen by a distant observer, but beyond its horizon there is a nonsingular expanding universe. In all these cases, both the metric and the torsion are regular in the whole space.

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The Behaviour of Effective Coupling Constants in “Finite” Grand Unification Theories in Curved Space-Time with Torsion

Abstract: PACS. 03.70 -Theory of quantized fields. PACS. 11.10 -Field theory. PACS. 04.50 -Unified field theories and other theories of gravitation.

Cited by 19 publications

References 35 publications

Conformally coupled induced gravity with gradient torsion

Conformally coupled induced gravity with gradient torsion

Cosmological constant and Euclidean space from nonperturbative quantum torsion

Wormholes and black universes without phantom fields in Einstein-Cartan theory

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