A homogeneous and isotropic universe in Lorentz gauge theory of gravity

作者：Borzou Ahmad^*; Mirza Behrouz

来源：Classical and Quantum Gravity, 2017, 34(14): 145005.

DOI：10.1088/1361-6382/aa7647

• Lorentz gauge theory
• cosmology
• cosmological constant problem

Lorentz gauge theory of gravity was recently introduced. We study the homogeneous and isotropic universe of this theory. It is shown that some time after the matter in the universe is diluted enough, at z similar to 0.6, the decelerating expansion shifts spontaneously to an accelerating one without a dark energy. We discuss that Lorentz gauge theory puts no constraint on the total energy content of the universe at present time and therefore the magnitude of vacuum energy predicted by field theory is not contradictory anymore. It is demonstrated that in this theory the limit on the number of relativistic particles in the universe is much looser than in GR. An inflationary mechanism is discussed as well. We show that the theory, unlike GR, does not require the slow-roll or similar conditions to drive the inflation at the beginning of the universe.

• 出版日期2017-7-20