Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Sigbjørn Hervik"'
Autor:
Sigbjørn Hervik, Marcello Ortaggio
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 11, Pp 1-10 (2020)
Abstract We explore how far one can go in constructing d-dimensional static black holes coupled to p-form and scalar fields before actually specifying the gravity and electrodynamics theory one wants to solve. At the same time, we study to what exten
Externí odkaz:
https://doaj.org/article/64f42fd552234acea27f8ee52901b3b7
Autor:
Sigbjørn Hervik, Marcello Ortaggio
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-24 (2020)
Abstract We prove that a generalized Schwarzschild-like ansatz can be consistently employed to construct d-dimensional static vacuum black hole solutions in any metric theory of gravity for which the Lagrangian is a scalar invariant constructed from
Externí odkaz:
https://doaj.org/article/48a35a2e52ce4106990f4f83feecaa16
Publikováno v:
Geometry, Lie Theory and Applications ISBN: 9783030812959
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5065f15faa3b0b8024fcd10ed1d8a9c4
https://doi.org/10.1007/978-3-030-81296-6_11
https://doi.org/10.1007/978-3-030-81296-6_11
Autor:
Marcello Ortaggio, Sigbjørn Hervik
Publikováno v:
291-?
Acta Physica Polonica B, Proceedings Supplement
Acta Physica Polonica B, Proceedings Supplement
Recent results of arXiv:1907.08788 on universal black holes in $d$ dimensions are summarized. These are static metrics with an isotropy-irreducible homogeneous base space which can be consistently employed to construct solutions to virtually any metr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bfad93f17ff2bd0f894a11b5a30a5831
https://hdl.handle.net/11250/2736354
https://hdl.handle.net/11250/2736354
This book consists of contributions from the participants of the Abel Symposium 2019 held in Ålesund, Norway. It was centered about applications of the ideas of symmetry and invariance, including equivalence and deformation theory of geometric stru
Autor:
Sigbjørn Hervik, Marcello Ortaggio
Publikováno v:
Journal of High Energy Physics (JHEP)
Journal of High Energy Physics
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-24 (2020)
Journal of High Energy Physics
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-24 (2020)
We prove that a generalized Schwarzschild-like ansatz can be consistently employed to construct $d$-dimensional static vacuum black hole solutions in any metric theory of gravity for which the Lagrangian is a scalar invariant constructed from the Rie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d69a6f8bff969676d2da3fb5748881f3
Autor:
Sigbjørn Hervik, Ben David Normann
Publikováno v:
Classical and Quantum Gravity. 37:145002
What is the asymptotic future of a scalar-field model if the assumption of isotropy is relaxed in generic, homogeneous space-times with general relativity? This paper is a continuation of our previous work on Bianchi cosmologies with a $p$-form field
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bcbc70b1c0618d53f5f3161c3a699a0
https://doi.org/10.1088/1361-6382/ab8be7
https://doi.org/10.1088/1361-6382/ab8be7
Autor:
Sigbjørn Hervik, Ben David Normann
Publikováno v:
Classical and Quantum Gravity. 37:085002
Continuing previous work, we show the existence of stable, anisotropic future attractors in Bianchi invariant sets with a $p$-form field ($p\,\in\,\{1,3\}$) and a perfect fluid. In particular, we consider the not previously investigated Bianchi invar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::855827447e7f11c8c1d823cf3cc9a066
https://doi.org/10.1088/1361-6382/ab719b
https://doi.org/10.1088/1361-6382/ab719b
Autor:
Sigbjørn Hervik, D. D. McNutt
A pseudo-Riemannian manifold is called CSI if all scalar polynomial invariants constructed from the curvature tensor and its covariant derivatives are constant. In the Lorentzian case, the CSI spacetimes have been studied extensively due to their app
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ad80dcfa092830889de8b6e18bfc53a
http://arxiv.org/abs/1812.11148
http://arxiv.org/abs/1812.11148
We study universal electromagnetic (test) fields, i.e., p-forms fields F that solve simultaneously (virtually) any generalized electrodynamics (containing arbitrary powers and derivatives of F in the field equations) in n spacetime dimensions. One of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::178437eb0432c309d7f92ca2819827e2