Linearly expanding universes in JBD-theory

Details Linearly expanding universes in JBD-theory Linearly expanding universes in JBD-theory

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66..515c&link_type=abstract

Astrophysics and Space Science, vol. 66, no. 2, Dec. 1979, p. 515-517.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Models, Big Bang Cosmology, Gravitation Theory, Universe, Barotropic Flow, Equations Of Motion, Equations Of State, Gravitational Constant, Scalars

Scientific paper

The assumption of a linearly expanding universe for the Jordan-Brans and Dicke (JBD) cosmological equations generates a set of solutions for the barotropic equations of state p equals alpha times rho (alpha a constant). These solutions turn out to be valid for closed space except in the case p equals rho, which is for open space. The 'gravitational constant', which is inversely proportional to the scalar field (phi) increases with time if alpha is greater than -1/3 and decreases for alpha less than -1/3. No solution exists for alpha equals -1/3. The Brans-Dicke parameter (omega) is negative if alpha is less than -1/3.

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