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1
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I was wondering about the fundamental constants of Nature since several years, and still pondering on them. Of course, I have read a lot of papers on them, but never found any satisfying classificati …
asked Dec 25 '18 by Cham
1
vote
0answers
The electromagnetic (EM) radiation energy-momentum tensor is of the following shape, in the case of incoherent superposition of EM plane waves (I'm using $c = 1$ to simplify things, and metric signatu …
asked Dec 26 '18 by Cham
0
votes
1answer
Usually, when we apply the non-relativistic limit ($c \rightarrow \infty$) to relativistic equations, the cosmological constant $\Lambda \sim \mathrm{L}^{-2}$ is simply offhandedly neglected by puttin …
asked Dec 30 '18 by Cham
7
votes
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I'm looking for references on Lemaître's "hesitating" universe models, defined by a long period of stagnation of the cosmological scale factor. These models are using a cosmological constant $\Lambda …
asked Dec 16 '16 by Cham
15
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1answer
The cosmological constant $\Lambda$ can be introduced into the gravitational action like this : \begin{equation} S = \frac{1}{2 \kappa} \int_{\Omega} (R - 2 \Lambda) \sqrt{-g} \; d^4 x + \text{matter …
asked Nov 27 '15 by Cham
0
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The question is simple: Does the naive reasoning below have some physical sense, or is it pure gibberish junk? (I use $c = 1$ and metric signature $\eta = (1, -1, -1, -1)$) I suppose that the class …
asked Dec 28 '18 by Cham