Physical versions of non-linear gravity theories and positivity of energy

Details Physical versions of non-linear gravity theories and positivity of energy Physical versions of non-linear gravity theories and positivity of energy

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cqgra...6.2045s&link_type=abstract

Classical and Quantum Gravity (ISSN 0264-9381), vol. 6, Dec. 1, 1989, p. 2045-2050.

Physics

25

Cosmology, Gravitation Theory, Relativistic Theory, Space-Time Functions, Cauchy Problem, Conformal Mapping, Theoretical Physics, Wave Functions

Scientific paper

Brans (1988) has criticized claims that nonlinear metric theories of gravity are physically equivalent to general relativity with additional fields. Conceding that the physical metric is determined by its interaction with matter, it is emphasized that at present the available data are too scarce for it. It is argued that, for the theories which are mathematically equivalent under a conformal rescaling of the metric (this is the case of Lagrangian solely depending on the scalar curvature), a unique choice of physical variables can be based on a theoretical criterion - that of positivity of energy.

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