2019/03/03 by Tao Lei, Ziwei Chen, Lei, Tao +5
Physics and Astronomy · #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #Black Holes and Theoretical Physics
paper · pdf · doi:10.48550/arxiv.1903.01445
Motivated by a special consideration in quantum measurement, we present a new improved energy-momentum tensor. The new tensor differs from the traditional canonical and symmetric ones, and can be derived as Nother current from a Lagrangian with second derivative. We also attempt to construct a gravitational coupling in such a way that the new energy-momentum tensor becomes the source of the gravitational field. The theory we obtain is of an Einstein-Cartan type, but derived from a minimal coupling of a Lagrangian with second-derivative, and leads to additional interaction between torsion and matter, including the scalar field. For the scalar field, the theory can also be derived in the Riemann space-time by a non-minimal coupling. Our study gives hint on more general tests of general relativistic effects.