In an alternative cosmology the Friedmann equation is given by (a/a)^2=8πG/3ρ^2,, where all symbols have their usual meaning. Assume that the universe is filled by a fluid with ρ∝a−3w, where w is a constant, calculate the time evolution of the scale factor. Select one answer. a. a∝t^1/(3w) b. a∝t^1/(3w+1) c. a∝t^1/(4w) d. a∝t^−w/3
In an alternative cosmology the Friedmann equation is given by (a/a)^2=8πG/3ρ^2,, where all symbols have their usual meaning. Assume that the universe is filled by a fluid with ρ∝a−3w, where w is a constant, calculate the time evolution of the scale factor. Select one answer. a. a∝t^1/(3w) b. a∝t^1/(3w+1) c. a∝t^1/(4w) d. a∝t^−w/3
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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In an alternative cosmology the Friedmann equation is given by (a/a)^2=8πG/3ρ^2,, where all symbols have their usual meaning.
Assume that the universe is filled by a fluid with ρ∝a−3w, where w is a constant, calculate the time evolution of the scale factor. Select one answer.
a.
a∝t^1/(3w)
b.
a∝t^1/(3w+1)
c.
a∝t^1/(4w)
d.
a∝t^−w/3
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