Poincare gauge theory of gravity: Friedman cosmology with even and odd parity modes: Analytic part

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Title:	Poincare gauge theory of gravity: Friedman cosmology with even and odd parity modes: Analytic part
Authors:	Baekler,P;Hehl,FW;Nester,JM
Contributors:	天文研究所
Keywords:	METRIC-AFFINE GRAVITY;FUNDAMENTAL PARTICLES;BIANCHI IDENTITIES;HAMILTONIAN ANALYSIS;GENERAL-RELATIVITY;NOETHER IDENTITIES;FIELD-THEORIES;TORSION;EQUATIONS;UNIVERSE
Date:	2011
Issue Date:	2012-03-27 18:12:43 (UTC+8)
Publisher:	國立中央大學
Abstract:	We propose a cosmological model in the framework of the Poincare gauge theory of gravity (PG). The gravitational Lagrangian is quadratic in both curvature and torsion. In our specific model, the Lagrangian contains (i) the curvature scalar R and the curvature pseudoscalar X linearly and quadratically (including an RX term) and (ii) pieces quadratic in the torsion vector V and the torsion axial vector A (including a V A term). We show generally that in quadratic PG models we have nearly the same number of parity conserving terms ("world") and of parity violating terms ("shadow world"). This offers new perspectives in cosmology for the coupling of gravity to matter and antimatter. Our specific model generalizes the fairly realistic "torsion cosmologies" of Shie-Nester-Yo (2008) and Chen et al. (2009). With a Friedman type ansatz for an orthonormal coframe and a Lorentz connection, we derive the two field equations of PG in an explicit form and discuss their general structure in detail. In particular, the second field equation can be reduced to first order ordinary differential equations for the curvature pieces R(t) and X(t). Including these along with certain relations obtained from the first field equation and curvature definitions, we present a first order system of equations suitable for numerical evaluation. This is deferred to the second, numerical part of this paper.
Relation:	PHYSICAL REVIEW D
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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