Nonlinear Gravity Theories in the Metric and Palatini Formalisms

Details Nonlinear Gravity Theories in the Metric and Palatini Formalisms Nonlinear Gravity Theories in the Metric and Palatini Formalisms

2004-03-22

arxiv.org/abs/gr-qc/0403092v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages

Scientific paper

We study nonlinear gravity theories in both the metric and the Palatini (metric-affine) formalisms. The nonlinear character of the gravity lagrangian in the metric formalism causes the appearance of a scalar source of matter in Einstein's equations that can be interpreted as a quintessence field. However, in the Palatini case no new energy sources appear, though the equations of motion get modified in such a way that usual matter can lead to repulsive gravity at very low densities. Thus, the Palatini formalism could provide a mechanism to explain the recent acceleration of the universe without the necessity of dark energy sources. We also show that in contrast to the metric formalism where only the Einstein frame should be considered as physical, the Palatini formalism allows both the Einstein and the Jordan frames to be physically acceptable.

Affiliated with

Also associated with

No associations

Rating

Nonlinear Gravity Theories in the Metric and Palatini Formalisms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nonlinear Gravity Theories in the Metric and Palatini Formalisms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonlinear Gravity Theories in the Metric and Palatini Formalisms will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-678584