Temat: 04.20.Cv - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Discrete Space-Time by Means of the Weyl-Dirac Theory
Autorzy:: Agop, M.
Chicos, L.
Gîrţu, M.
Powiązania:: https://bibliotekanauki.pl/articles/2047353.pdf
Data publikacji:: 2007-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 04.20.Cv
05.45.Df
Opis:: A connection between the Weyl-Dirac theory and scale relativity theory through the hydrodynamic models (relativistic and non-relativistic approaches) is established. In such conjecture, considering that the motions of the microparticles take place on continuous but non-differentiable curves i.e. on fractals, a Weyl-Dirac type equation was found. Some correspondences with known hydrodynamic models, particularly Białynicki-Birula's approach, are analyzed. All these results reflect the fractal structure of the space-time (a concept in agreement with the new ideas on the space-time)
Źródło:: Acta Physica Polonica A; 2007, 112, 1; 3-12
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Stability of Reissner-Nordström Black Hole
Autorzy:: Nashed, G. G. L.
Powiązania:: https://bibliotekanauki.pl/articles/2047354.pdf
Data publikacji:: 2007-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 04.20.Cv
04.50.+h
04.20.-q
Opis:: The singularity of the solutions obtained before in the teleparallel theory of gravitation is studied. Also the stability of these solutions is studied using the equations of geodesic deviation. The condition of stability is obtained. From this condition the stability of the Schwarzschild solution can be obtained.
Źródło:: Acta Physica Polonica A; 2007, 112, 1; 13-21
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wormhole Solution and Energy in Teleparallel Theory of Gravity
Autorzy:: Nashed, G. G. L.
Powiązania:: https://bibliotekanauki.pl/articles/2047256.pdf
Data publikacji:: 2007-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 04.20.Cv
04.50.+h
04.20.-q
Opis:: An exact solution is obtained in the tetrad theory of gravitation. This solution is characterized by two parameters k$\text{}_{1}$, k$\text{}_{2}$ of spherically symmetric static Lorentzian wormhole which is obtained as a solution of the equation ρ= ρ$\text{}_{t}$=0 with ρ=T$\text{}_{i,j}$u$\text{}^{i}$u$\text{}^{j}$, ρ$\text{}_{t}$ =(T$\text{}_{ij}$-1/2Tg$\text{}_{ij}$) u$\text{}^{i}$u$\text{}^{j}$, where u$\text{}^{i}$u$\text{}_{i}$=-1. From this solution which contains an arbitrary function we can generate the other two solutions obtained before. The associated metric of this space-time is a static Lorentzian wormhole and it includes the Schwarzschild black hole, a family of naked singularity and a disjoint family of Lorentzian wormholes. Calculating the energy content of this tetrad field and using the gravitational energy momentum given by Møller in the teleparallel space-time we find that the resulting form depends on the arbitrary function and does not depend on the two parameters k$\text{}_{1}$ and k$\text{}_{2}$ characterizing the wormhole. Using the regularized expression of the gravitational energy momentum we get the value of energy which does not depend on the arbitrary function.
Źródło:: Acta Physica Polonica A; 2007, 111, 2; 201-213
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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