Zobrazeno 1 - 10
of 79
pro vyhledávání: '"R. Klippert"'
Publikováno v:
Physical Review D. 98
Hadamard-Papapetrou method of field discontinuities is here employed in order to determine the effective metric that describes the propagation of acoustic perturbations in isentropic fluids. It is shown that, when dissipative effects are present, sma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7785e7be96115b59d0485cc06d80e34d
https://doi.org/10.1103/physrevd.98.064042
https://doi.org/10.1103/physrevd.98.064042
Crude comparison between four alternative proposals for the very definition of a wormhole is provided, all of which were intended to apply to the dynamical cases. An interesting dynamical solution, based upon large scale magnetic fields, is used for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37a1e0ac754ba5e17dd7305934c0f485
We investigate diagonal Bianchi-I spacetimes in the presence of viscous fluids by using the shear and the anisotropic pressure components as the basic variables, where the viscosity is driven by the (second-order) causal thermodynamics. A few exact s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e20ecad0388742f9f91bc20f5b54db2
http://arxiv.org/abs/1610.00020
http://arxiv.org/abs/1610.00020
Publikováno v:
International Journal of Modern Physics: Conference Series. :276-280
The matter state appearing just after the inelastic hadronic collisions, presently called 'glasma', is here taken as the dominant matter-energy content of the early universe. As a result, an anisotropic cosmological toy-model is obtained in the limit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a95c953ad615785c466bb1b445de1ef7
https://doi.org/10.1142/s201019451100136x
https://doi.org/10.1142/s201019451100136x
Publikováno v:
AIP Conference Proceedings.
The propagation of light pulses inside nonlinear static media is described in the limit of geometrical optics. A spherically symmetric dielectric model for a nonlinear medium at rest is obtained, with the help of which an exact analogue model of stat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62aa81f625a465ea71793da3c61a2196
https://doi.org/10.1063/1.4912541
https://doi.org/10.1063/1.4912541
Wave propagation in nonlinear theories of the electromagnetism described by Lagrangian densities dependent upon its two local invariants L(F, G) is revisited. On the light of the recent findings in metamaterials, it is here shown that trirefringence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f659f0b3ba6671792e9c7ac4f1d4651
Autor:
M. M. C. Mello, R. Klippert
Publikováno v:
AIP Conference Proceedings.
Dirac fermions and electromagnetic fields are considered as the source of gravitation in the framework of standard Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology. It is shown that all solutions for the scale-factor a(t) are non-singular, provid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::781bfc49636353f4c21eeda1b1f94be5
https://doi.org/10.1063/1.4912540
https://doi.org/10.1063/1.4912540
Publikováno v:
Classical and Quantum Gravity. 20:859-871
We show that a flowing dielectric medium with a linear response to an external electric field can be used to generate an analog geometry that has many of the formal properties of a Schwarzschild black hole for light rays, in spite of birefringence. W
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::170087eca67e652789621df9b9d0c0c9
https://doi.org/10.1088/0264-9381/20/5/306
https://doi.org/10.1088/0264-9381/20/5/306
Autor:
H. C. Rosu, R. Klippert
Publikováno v:
International Journal of Theoretical Physics. 41:331-340
The strictly nonrelativistic isospectral scheme based on the general Riccati solution and Darboux transformation function corresponding to excited states is presented on the following examples: the harmonic oscillator, the square well, and the hydrog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6334181575a11130bef20cd12b375e9
https://doi.org/10.1023/a:1014067108527
https://doi.org/10.1023/a:1014067108527
Propagation of light in nonlinear materials is here studied in the regime of the geometrical optics. It is shown that a spherically symmetric medium at rest with some specific dielectric properties can be used to produce an exact analogue model for a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e201353cc3d74c35837268a035790ca5
http://arxiv.org/abs/1401.7544
http://arxiv.org/abs/1401.7544