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Cho, Yongmin
School of Natural Science
Research Interests
  • Higher-dimensional Unified Field Theory

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A MINIMAL MODEL OF LORENTZ GAUGE GRAVITY WITH DYNAMICAL TORSION

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Title
A MINIMAL MODEL OF LORENTZ GAUGE GRAVITY WITH DYNAMICAL TORSION
Author
Cho, YongminPak, D. G.Park, B. S.
Keywords
Lorentz gauge symmetry;  Quantum gravity;  Torsion
Issue Date
201006
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Citation
INTERNATIONAL JOURNAL OF MODERN PHYSICS A, v.25, no.14, pp.2867 - 2882
Abstract
A new Lorentz gauge gravity model with R(2)-type Lagrangian is proposed. In the absence of classical torsion, the model admits a topological phase with an arbitrary metric. We analyze the equations of motion in constant curvature space-time background using the Lagrange formalism and demonstrate that the model possesses a minimal set of dynamic degrees of freedom for the torsion. Surprisingly, the number of torsion dynamic degrees of freedom equals the number of physical degrees of freedom for the metric tensor. An interesting feature of the model is that the spin-2 mode of torsion becomes dynamical essentially due to the nonlinear structure of the theory. We perform covariant one-loop quantization of the model for a special case of constant curvature space-time background. We treat the contortion as a quantum field variable where as the metric tensor is kept as a classical object. We discuss a possible mechanism of an emergent Einstein gravity as a part of the effective theory induced due to quantum dynamics of torsion.
URI
http://scholarworks.unist.ac.kr/handle/201301/3041
DOI
http://dx.doi.org/10.1142/S0217751X10048524
ISSN
0217-751X
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ECE_Journal Papers
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