K. D. Krori, D. Nandy
Abstract
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It is shown that a sufficient condition for Birkhoff's (1927) theorem to hold for the Sen-Dunn (1971) and Ross (1972) scalar-tensor theories of gravitation is that the scalar field should be time-invariant. An earlier result due to Reddy (1973) in the case of the Sen-Dunn theory is thus corrected.
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It is shown that a sufficient condition for Birkhoff's (1927) theorem to hold for the Sen-Dunn (1971) and Ross (1972) scalar-tensor theories of gravitation is that the scalar field should be time-invariant. An earlier result due to Reddy (1973) in the case of the Sen-Dunn theory is thus corrected.
Key concepts: Scalar theories of gravitation, Scalar–tensor theory, Mathematical physics, Scalar (mathematics), Gravitation, Scalar field, Classical field theory, Invariant (physics)