Decaying Dark Matter: Modern Cosmology and the Dark Matter Problem . D. W. Sciama. Cambridge University Press, New York, 1994. xviii, 216 pp., illus. Paper, $29.95 or £17.95. Cambridge Lecture Notes in Physics, 3.; The Renaissance of General Relativity and Cosmology . A Survey to Celebrate the 65th Birthday of Dennis Sciama. George Ellis, Antonio Lanza, and John Miller, Eds. Cambridge University Press, New York, 1994. x, 331 pp., illus. $49.95 or £30. From a meeting, Trieste, Italy, April 1992.

Science ◽  
1994 ◽  
Vol 265 (5173) ◽  
pp. 817-817
Author(s):  
Craig J. Hogan
2011 ◽  
Vol 26 (33) ◽  
pp. 2501-2521
Author(s):  
GREG P. PROPER

The prevailing view in modern cosmology is that the universe is comprised of immense quantities of exotic materials (i.e. Dark Matter and Dark Energy) that have yet to be positively identified. However, there is also a small group of scientists who believe that the answer to this dilemma is to be found in the modification of gravity (i.e. General Relativity). This short paper states that if we make the bold assumption that all objects/observers are comprised of sets of spacetime coordinates that change (albeit slowly) as the universe ages, then three puzzles that currently confront cosmologists, astronomers and astrophysicists can easily be answered using relatively simple calculations. The condition necessary to explore this possibility can be obtained if one postulates that relativistic gravitational potential lessens (in absolute magnitude) everywhere as the universe ages (n). That is, the spacetime metric gμν(x)→gμν(x, n). If gravity behaves in this manner, then it can be shown that it is the causitive agent of indeterminism in nature.


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