Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Ivan Kolar"'
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
Autor:
Anupam Mazumdar, Carlos Heredia Pimienta, Josep Llosa, Ivan Kolar, Francisco José Maldonado Torralba
Publikováno v:
Classical and Quantum Gravity, 39(8):085001. IOP PUBLISHING LTD
This article aims to transform the infinite-order Lagrangian density for ghost-free infinite-derivative linearized gravity into non-local. To achieve it, we use the theory of generalized functions and the Fourier transform in the space of tempered di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::805d401dfd113b8655011b05749eac6a
http://www.scopus.com/inward/record.url?scp=85126851029&partnerID=8YFLogxK
http://www.scopus.com/inward/record.url?scp=85126851029&partnerID=8YFLogxK
Publikováno v:
Physical Review D, 105(4):044045. AMER PHYSICAL SOC
We present a new bouncing cosmological solution of the non-local theory known as infinite derivative gravity, which goes beyond the recursive ansatz, ${\Box R = r_1 R +r_2}$. The non-local field equations are evaluated using the spectral decompositio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77012fcc7e4caad51b249aef28d45092
https://research.rug.nl/en/publications/d17386a1-0a69-4d14-b21d-71876ab38a4d
https://research.rug.nl/en/publications/d17386a1-0a69-4d14-b21d-71876ab38a4d
Autor:
Ivan Kolar
Publikováno v:
Physical Review D, 105(8):084026. AMER PHYSICAL SOC
We solve the non-local equation ${-e^{-\ell^2\square}\square{\phi}=J}$ for i) static scalar fields in static spacetimes and ii) time-dependent scalar fields in ultrastatic spacetimes. Corresponding equations are rewritten as non-local Poisson/inhomog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d854fc67a2ed8dbe2d9eefd15a03a7ea
http://arxiv.org/abs/2201.09908
http://arxiv.org/abs/2201.09908
Publikováno v:
Ekscentar
Volume 18
Issue 21
Volume 18
Issue 21
U ovom radu prikazan je postupak određivanja visina točaka geodetske osnove u parku Jelenovac u Zagrebu, a koja se koristi za potrebe praktične nastave na kolegijima Geodetskog fakulteta Sveučilišta u Zagrebu. Nakon pripremnih radova, kao što j
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::a5b3e7ff50727fc28e3ddf8129cc38c5
https://www.bib.irb.hr/1093302
https://www.bib.irb.hr/1093302
Publikováno v:
Physical Review D. 93
We formulate several criteria under which the symmetries associated with the Killing and Killing-Yano tensors on the base space can be lifted to the symmetries of the full warped geometry. The procedure is explicitly illustrated on several examples,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9746884d1f0be2a2dcc1e19f96e4f3a0
https://doi.org/10.1103/physrevd.93.024057
https://doi.org/10.1103/physrevd.93.024057
Autor:
Pavel Krtouš, Ivan Kolar
Publikováno v:
Physical Review D. 93
We study spacetimes that lead to a separable Klein-Gordon equation in a general dimension. We introduce an ansatz for the metric in higher dimensions motivated by analogical work by Carter in four dimensions and find solutions of the Klein-Gordon equ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3fb9468b525c0e8b286c3664c9bc6198
https://doi.org/10.1103/physrevd.93.024053
https://doi.org/10.1103/physrevd.93.024053
Autor:
Ivan Kolar, Pavel Krtouš
We investigate properties of higher-dimensional generally rotating black-hole spacetimes, so called Kerr-NUT-(A)dS spacetimes, as well as a family of related spaces which share the same explicit and hidden symmetries. In these spaces, we study a part
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c0b5254e0ac06298342638bc887993d
The aim of this work is threefold: First it should be a monographical work on natural bundles and natural op erators in differential geometry. This is a field which every differential geometer has met several times, but which is not treated in deta
Autor:
Ivan Kolar
Four children are presented with Class II pancreas injury as a result of a motor vehicle accident. The first child was taken to the operating room promptly due to concomitant perforation of the hollow viscus (gastric rupture) and underwent successful
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f6b986c43b1856cda7acbf49b272ca0
https://www.bib.irb.hr/690339
https://www.bib.irb.hr/690339