Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1994-08-25
Class.Quant.Grav.12:351-372,1995
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
34 pages
Scientific paper
10.1088/0264-9381/12/2/006
The actions of the ``$R=T$'' and string-inspired theories of gravity in (1+1) dimensions are generalized into one single action which is characterized by two functions. We discuss differing interpretations of the matter stress-energy tensor, and show how two such different interpretations can yield two different sets of field equations from this action. The weak-field approximation, post-Newtonian expansion, hydrostatic equilibrium state of star and two-dimensional cosmology are studied separately by using the two sets of field equations. Some properties in the ``$R=T$'' and string-inspired theories are shown to be generic in the theory induced by the generalized action.
Chan J. S. F.
Mann Robert B.
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