منابع مشابه
Non-Metric Gravity I: Field Equations
We describe and study a certain class of modified gravity theories. Our starting point is Plebanski formulation of gravity in terms of a tripple B of 2-forms, a connection A and a “Lagrange multiplier” field Ψ. The generalization we consider stems from presence in the action of an extra term proportional to a scalar function of Ψ. As in the usual Plebanski general relativity (GR) case, a certai...
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We show that almost all metric–affine theories of gravity yield Einstein equations with a non–null cosmological constant Λ. Under certain circumstances and for any dimension, it is also possible to incorporate a Weyl vector field Wμ and therefore the presence of an anisotropy. The viability of these field equations is discussed in view of recent astrophysical observations.
متن کاملMetric–Affine Gauge Theory of Gravity I. Fundamental Structure and Field Equations
We give a self–contained introduction into the metric–affine gauge theory of gravity. Starting from the equivalence of reference frames, the prototype of a gauge theory is presented and illustrated by the example of Yang–Mills theory. Along the same lines we perform a gauging of the affine group and establish the geometry of metric–affine gravity. The results are put into the dynamical framewor...
متن کاملMetric from Non-Metric Action of Gravity
The action of general relativity proposed by Capovilla, Jacobson and Dell is written in terms of SO(3) gauge fields and gives Ashtekar's constraints for Einstein gravity. However, it does not depend on the space-time metric nor its signature explicitly. We discuss how the space-time metric is introduced from algebraic relations of the constraints and the Hamiltonian by focusing our attention on...
متن کاملNote on Non-metric Gravity
We discuss a class of alternative gravity theories that are specific to four dimensions, do not introduce new degrees of freedom, and come with a physical motivation. In particular we sketch their Hamiltonian formulation, and their relation with some earlier constructions. Email address: [email protected]. Supported by VR.
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2007
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/25/2/025001