Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Kassner, Klaus"'
Autor:
Piesnack, Julius, Kassner, Klaus
The ingoing Vaidya metric is introduced as a model for a non-rotating uncharged black hole emitting Hawking radiation. This metric is expected to capture the physics of the spacetime for radial coordinates up to a small multiple $(>1)$ of the Schwarz
Externí odkaz:
http://arxiv.org/abs/2103.08340
Autor:
Kassner, Klaus
Publikováno v:
Eur. Phys. J. Plus (2019) 134: 366
A recent proposal by Shuler regarding a postulate-based derivation of a family of metrics describing the gravitational field outside a static spherically symmetric mass distribution is reviewed. All of Shuler's gravities agree with the Schwarzschild
Externí odkaz:
http://arxiv.org/abs/1904.11205
Autor:
Kassner, Klaus
A simple model for an evaporating non-rotating black hole is considered, employing a global time that does not become singular at the putative horizon. The dynamics of a test particle falling radially towards the center of the black hole is then inve
Externí odkaz:
http://arxiv.org/abs/1801.00272
Autor:
Kassner, Klaus
Publikováno v:
Am. J. Phys. 85, 619 (2017)
A physics-first derivation of the Schwarzschild metric is given. Gravitation is described in terms of the effects of tidal forces (or of spacetime curvature) on the volume of a small ball of test particles (a dust ball), freely falling after all part
Externí odkaz:
http://arxiv.org/abs/1610.04507
Autor:
Kassner, Klaus
Publikováno v:
European Journal of Physics 38.1 (2016): 015605
The case for the utility of Kruskal-Szekeres coordinates in classroom made by Augousti et al. in this journal (Eur. J. Phys. 33:1--11, 2012) is strengthened by extending their discussion beyond the event horizon of the black hole. Observations made b
Externí odkaz:
http://arxiv.org/abs/1608.07511
Autor:
Kassner, Klaus
Publikováno v:
Advanced Studies in Theoretical Physics 11, 179 - 212 (2017) open access
As is well-known, the Schwarzschild metric cannot be derived based on pre-general-relativistic physics alone, which means using only special relativity, the Einstein equivalence principle and the Newtonian limit. The standard way to derive it is to e
Externí odkaz:
http://arxiv.org/abs/1602.08309
Autor:
Becker, Volker, Kassner, Klaus
A possible approach to the statistical description of granular assemblies starts from Edwards' assumption that all blocked states occupying the same volume are equally probable (S.F. Edwards, R. Oakeshott, Physica A 157, 1080 (1989)). We performed co
Externí odkaz:
http://arxiv.org/abs/1506.03288
Autor:
Kassner, Klaus
Publikováno v:
K. Kassner, Eur. J. Phys. 36 (2015) 065031
A promising way to introduce general relativity in the classroom is to study the physical implications of certain given metrics, such as the Schwarzschild one. This involves lower mathematical expenditure than an approach focusing on differential geo
Externí odkaz:
http://arxiv.org/abs/1502.00149
Publikováno v:
Phys. Rev. E 87, 042405 (2013)
The Kruskal-Segur approach to selection theory in diffusion-limited or Laplacian growth is extended via combination with the Zauderer decomposition scheme. This way nonlinear bulk equations become tractable. To demonstrate the method, we apply it to
Externí odkaz:
http://arxiv.org/abs/1302.6892
Autor:
Kassner, Klaus
Publikováno v:
K. Kassner, Am. J. Phys. 80, 1061-1066 (2012)
Selleri's paradox, based on an analysis of rotating frames, appears to show that the speed of light in an inertial system is not normally isotropic. This in turn seems at odds with the second postulate of special relativity requiring a universal ligh
Externí odkaz:
http://arxiv.org/abs/1302.6888