Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Ivan Kolář"'
Autor:
José Barrientos, Adolfo Cisterna, Ivan Kolář, Keanu Müller, Marcelo Oyarzo, Konstantinos Pallikaris
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 7, Pp 1-29 (2024)
Abstract In this paper, we obtain a complete list of stationary and axisymmetric spacetimes, generated from a Minkowski spacetime using the Ernst technique. We do so by operating on the associated seed potentials with a composition of Ehlers and Harr
Externí odkaz:
https://doaj.org/article/6f9d01aefd8a412ea82a9372c79d81fc
Publikováno v:
Annales Universitatis Paedagogicae Cracoviensis: Studia Mathematica, Vol 4, Iss 1, Pp 17-30 (2004)
We discuss two kinds of functorial prolongations of the functional bundle of all smooth maps between the fibers over the same base point of two fibered manifolds over the same base. We study the prolongation of vector fields in both cases and we prov
Externí odkaz:
https://doaj.org/article/6f3efb324e1c429f8617afbf787c6260
Autor:
Ulrich K. Beckering Vinckers, Álvaro de la Cruz-Dombriz, Ivan Kolář, Francisco J. Maldonado Torralba, Anupam Mazumdar
Publikováno v:
Physical Review D, 106(6):064037. AMER PHYSICAL SOC
We present the ghost-free infinite-derivative extensions of the Spherically-Reduced Gravity (SRG) and Callan-Giddings-Harvey-Strominger (CGHS) theories in two space-time dimensions. For the case of SRG, we specify the Schwarzschild-type gauge and dia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::901022b45c463c5d081c1ad56975aafb
https://doi.org/10.1103/physrevd.106.064037
https://doi.org/10.1103/physrevd.106.064037
Publikováno v:
Physical Review D, 105(4):044018. AMER PHYSICAL SOC
We study solutions describing spinning null sources called gyratons in generic theories of gravity with terms that are quadratic in curvature and contain an arbitrary number of covariant derivatives. In particular, we show that the properties of pp-w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d8521f5449afb2374d1ec1a584e3052
http://arxiv.org/abs/2107.11884
http://arxiv.org/abs/2107.11884
Autor:
Jens Boos, Ivan Kolář
Publikováno v:
Physical Review D, 104(2):024018. AMER PHYSICAL SOC
The weak-field Schwarzschild and NUT solutions of general relativity are gravitoelectromagnetically dual to each other, except on the positive $z$-axis. The presence of non-locality weakens this duality and violates it within a smeared region around
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1279f3f8158fdef99417688967ee61c2
https://research.rug.nl/en/publications/6aa2017d-4bb1-41cd-88ea-ce1521b8f3a2
https://research.rug.nl/en/publications/6aa2017d-4bb1-41cd-88ea-ce1521b8f3a2
Autor:
Miroslav Doupovec, Ivan Kolář
Publikováno v:
Archivum Mathematicum. :261-264
It is well known that the concept of holonomic $r$-jet can be geometrically characterized in terms of the contact of individual curves. However, this is not true for the semiholonomic $r$-jets, [5], [8]. In the present paper, we discuss systematicall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::930da3145f3e45c955a6f22fadab698b
https://doi.org/10.5817/am2019-4-261
https://doi.org/10.5817/am2019-4-261
Publikováno v:
Physical Review D, 103:064078. AMER PHYSICAL SOC
The junction conditions for the infinite derivative gravity theory ${R{+}RF(\Box)R}$ are derived under the assumption that the conditions can be imposed by avoiding the `ill-defined expressions' in the theory of distributions term by term in infinite
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::057ec3aeba14396ca5c63d35c2229526
https://hdl.handle.net/11370/fa63f6e7-7bf0-4228-86c2-1f3c5d489f29
https://hdl.handle.net/11370/fa63f6e7-7bf0-4228-86c2-1f3c5d489f29
Autor:
Jens Boos, Ivan Kolář
Publikováno v:
Physical Review
Physical Review D, 103:105004. AMER PHYSICAL SOC
Physical Review D, 103:105004. AMER PHYSICAL SOC
We study the retarded field sourced by a uniformly accelerated particle in a non-local scalar field theory. While the presence of non-locality regularizes the field at the location of the source, we also show that Lorentz-invariant non-local field th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1096067c95ccd6315f4f8338f019c57a
http://arxiv.org/abs/2102.07843
http://arxiv.org/abs/2102.07843
Autor:
Anupam Mazumdar, Ivan Kolář
Publikováno v:
Physical Review D, 101:124028. AMER PHYSICAL SOC
Theories with an infinite number of derivatives are described by non-local Lagrangians for which the standard Hamiltonian formalism cannot be applied. Hamiltonians of special types of non-local theories can be constructed by means of the (1+1)-dimens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30eba603906f5c4e8f251eb786b31b7a
https://hdl.handle.net/11370/b6f436ac-e511-4e65-bfa2-a6f80d0f495e
https://hdl.handle.net/11370/b6f436ac-e511-4e65-bfa2-a6f80d0f495e
Publikováno v:
Physical Review D, 102(4):044016. AMER PHYSICAL SOC
We study exact impulsive gravitational waves propagating in anti-de Sitter spacetime in the context of the ghost free infinite derivative gravity. We show that the source-free theory does not admit any AdS wave solutions other than that of Einstein's
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91a684f33a0bae8f2e1fefc399b0c094
http://arxiv.org/abs/2006.07650
http://arxiv.org/abs/2006.07650