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I guess I've found the solution in this paper: http://prd.aps.org/abstract/PRD/v8/i12/p4297_1

Homework Statement I should derive the Hubble law redshift from Maxwell equations in closed Universe. Homework Equations The metric of closed Universe is ds^2 = dt^2 - a^2(t)\left(d\chi^2 + \sin^2 \chi d\theta^2 + \sin^2 \chi \sin^2 \theta d\phi^2\right). The Hubble law redshift: \frac...

Thanks!

Where can i read about the solution of Einstein equations with spherical symmetry in tetrad formalism?

Are you troll? By defenition \mu_0 = 4\pi \cdot 10^{-7} Gn\cdot m,\ \epsilon = c^2/\mu_0 and not universal constants. 'c' is just a natural unit of speed.

The 'c' value is a fundamental property of our Universe. Maybe another universes with different values of c, h and G exist.

I now how magnets work. This question about para- and dia- magnetics. AFAIK \vec J = \chi \vec H and J doesn't depend from magnetic's form. But I have this question in my examination task and I don't think the answer so simple.

How does magnetization of a magnetic depend from its form?

Divide the series into two fractions: S = \sum_{n=0}^\infty \frac 1 {2^{n+1}} - \sum_{n=0}^\infty \frac 1 {2^{n+1}(n+1)} The first series is a geometrical progression, the second can be represented as \int_0^{1/2}\sum_{n=0}^\infty x^{n} dx.

Why J = - \left[cos(x)sin^{m-1}(x) \right]^{b}_{a} + I_{m}? Where did you found sin^{m - 1}\left(x\right)?

Can you give me an example of non-mathematical concepts?

Because it is the simplest choice for scalar constructed from g_{\mu\nu} and \Gamma^\mu_{\nu\lambda}.

The energy and momentum conservation laws are connected to time and space isotropy.