A nonmetric theory of gravity

作者：Ni Wei Tou^*

来源：International Journal of Modern Physics D, 2016, 25(11): 1640017.

DOI：10.1142/S0218271816400174

• Nonmetric theory
• Abelian axion
• pseudoscalar-photon interaction
• cosmic polarization rotation (CPR)
• cosmic birefringence
• equivalence principles
• Schiff's conjecture
• electromagnetism
• spacetime structure
• polarization

A nonmetric theory of gravity is presented, which agrees with all experiments to date. It possesses a Lagrangian-based nonmetric (i.e. nonminimum) coupling between electromagnetism and gravity which has complete continuous-coordinate-transformation symmetry but violates parity and time-reversal-invariance. The theory predicts the universality of free fall for test bodies, i.e. it obeys the Weak Equivalence Principle (WEP). But due to the nonmetrical coupling between electromagnetism and gravity, it violates the Einstein Equivalence Principle (EEP). Hence, this theory disproves the conjecture due to Schiff which states that any gravitation theory that obeys the WEP must also, unavoidably, obey the EEP. Further examination of the empirical status implications of the EEP is therefore urged.

• 出版日期2016-10