Dimensional transmutation in gravity and cosmology

Gravitation and Cosmology in Generalized (1+1)-dimensional dilaton gravity

The actions of the “R = T” and string-inspired theories of gravity in (1+1) dimensions are generalized into one single action which is characterized by two functions. We discuss differing interpretations of the matter stress-energy tensor, and show how two such different interpretations can yield two different sets of field equations from this action. The weak-field approximation, post-Newtonia...

Conserved Currents in D-dimensional Gravity and Brane Cosmology

We construct conserved currents, divergences of antisymmetric tensor densities (superpotentials) in D-dimensional gravity on arbitrary curved backgrounds using proven methods. These superpotentials have two remarkable properties: they depend in an essential way on second derivatives in the Lagrangian and are independent on divergences added to it. The conserved currents are thus particulary wel...

Modified gravity and cosmology

Anomaly Mediation and Dimensional Transmutation

We show how a sparticle spectrum characteristic of anomaly mediation can arise from a theory whose Lagrangian contains no explicit mass scale. The scale of supersymmetry breaking is governed by the gravitino mass, which is the vacuum expectation value of the F -term of the conformal compensator field, and the tachyonic slepton problem is resolved by the breaking of a U ′ 1 gauge symmetry at a s...

Lorentzian Gravity and Cosmology

If a material vacuum exists, with the properties of a superfluid through which already recognized material moves, then it is capable of acting as a universal reference frame and as an intermediary for the production of particle pairs throughout the universe, which as they cool and recombine, become the source of both high-and low-temperature cosmic background radiation, as observed. Moreover, i...