Uniform Newtonian models with variable mass |
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Authors: | J C Carvalho J A S Lima |
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Institution: | (1) Departamento de Física-CCE, Universidade Federal do Rio Grande do Norte, 59072 Natal-RN, Brazil |
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Abstract: | A Newtonian version of the spatially homogeneous and isotropic cosmological models with variable mass is presented. Under the assumption that the mass variation is a strict cosmological effect, its influence on the evolution of the scale function is established for the case of a dust-filled universe. Unlike the usual Newtonian models the present value of the deceleration parameter (q 1) obtained from the luminosity distance versus redshift relation can be fitted for a time-decreasing mass. It is also shown that the hyperbolic, parabolic or elliptic character of the fluid motion can be modified along the expansion. Likewise, a Friedmann-type equation with a variable curvature term indicates that in the frame-work of a full geometric variable mass theory, the same may occur with the open, flat or closed character of the universe spatial section. |
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