Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Forsberg, Mats"'
Autor:
Forsberg, Mats
Bakgrund I Sverige får varje år cirka 1 000 personer diagnosen multipel skleros (MS) och ungefär 28 000 har sjukdomen. 80 procent av de som insjuknar får symtom som yttrar sig som energilöshet, svårigheter att koncentrera sig, försvagad mental
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-38488
Publikováno v:
Universe 2017, 3(4), 69
In this work we consider perturbations of homogeneous and hypersurface orthogonal cosmological backgrounds with local rotational symmetry (LRS), using a method based on the 1 + 1 + 2 covariant split of spacetime. The backgrounds, of LRS class II, are
Externí odkaz:
http://arxiv.org/abs/1801.01147
Autor:
Wessén, Fredrik, Forsberg, Mats
In the best of worlds, all marketing is relevant. This study brings light to and creates understanding for how to capture the opportunities for target marketing, given by resent technical development and improvement. Customers often perceive marketin
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-6321
Autor:
Forsberg, Mats
Gravitational perturbations can be in the form of scalars, vectors or tensors. This thesis focuses on the evolution of scalar perturbations in cosmology, and interactions between tensor perturbations, in the form of gravitational waves, and plasma wa
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38387
Publikováno v:
J. Cosmol. Astropart. Phys. (JCAP) 11 (2015) 042
A general treatment of vorticity-free, perfect fluid perturbations of Kantowski-Sachs models with a positive cosmological constant are considered within the framework of the 1+1+2 covariant decomposition of spacetime. The dynamics is encompassed in s
Externí odkaz:
http://arxiv.org/abs/1507.08300
Publikováno v:
Springer Proceedings in Mathematics & Statistics 60, 289-293 (2014)
We investigate perturbations of Kantowski-Sachs models with a positive cosmological constant, using the gauge invariant 1+3 and 1+1+2 covariant splits of spacetime together with a harmonic decomposition. The perturbations are assumed to be vorticity-
Externí odkaz:
http://arxiv.org/abs/1304.1010
Publikováno v:
Proceedings of the Thirteenth Marcel Grossman Meeting on General Relativity, Eds. RT Jantzen, K Rosquist, R Ruffini, World Scientific Singapore, p. 2547-2549 (2015)
Perturbations of Kantowski-Sachs models with a positive cosmological constant are considered in a harmonic decomposition, in the framework of gauge invariant 1+3 and 1+1+2 covariant splits of spacetime. Scalar, vector and tensor modes are allowed, ho
Externí odkaz:
http://arxiv.org/abs/1303.4576
Publikováno v:
Class. Quantum Grav. 29 (2012) 095023
In this work the growth of density perturbations in Kantowski-Sachs cosmologies with a positive cosmological constant is studied, using the 1+3 and 1+1+2 covariant formalisms. For each wave number we obtain a closed system for scalars formed from qua
Externí odkaz:
http://arxiv.org/abs/1106.4932
Publikováno v:
Phys.Rev.D82:024001,2010
The interaction between gravitational and electromagnetic waves in the presence of a static magnetic field is studied. The field strength of the static field is allowed to surpass the Schwinger critical field, such that the quantum electrodynamical (
Externí odkaz:
http://arxiv.org/abs/1005.5286
Autor:
Forsberg, Mats, Brodin, Gert
Publikováno v:
Phys.Rev.D77:024050,2008
Here we consider the nonlinear evolution of Alfven waves that have been excited by gravitational waves from merging binary pulsars. We derive a wave equation for strongly nonlinear and dispersive Alfven waves. Due to the weak dispersion of the Alfven
Externí odkaz:
http://arxiv.org/abs/0711.4025