مطالب مرتبط با «se425» در ---- | نویسنده: کامران عباسی
SE4
We now consider the real meaning of the constant k which appears in the Friedmaequationa ̇a2=8πGkρ − 2 .3a(4.1)While the Newtonian derivation in the last chapter introduced this as a measure of theenergy per particle, the true interpretation, apparent in the context of general relativity, isthat it measures the curvature of space. General relativity tells us that gravity is due to thecurvature of four-dimensional space–time, and a full analysis can be found in any generalrelativity textbook. Here I will be purely descriptive, and focus on the interpretation ofk as measuring the curvature of the three spatial dimensions. Further details of generalrelativistic cosmology can be found in Advance...
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