Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Jacques Demaret"'
Autor:
Jacques Demaret, Christian Scheen
Publikováno v:
Physics Letters B. 399:207-214
Using both exact and numerical tools, we show that the analytic structure of SO(3) -invariant spatially homogeneous relativistic dynamics precisely confirms the reliability of discrete mappings due to Belinskij, Khalatnikov and Lifchitz. We propose a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0db7a7ab4c0d67e93a24265ad3fffbe9
https://doi.org/10.1016/s0370-2693(97)00289-x
https://doi.org/10.1016/s0370-2693(97)00289-x
Publikováno v:
Foundations of Science. 2:137-176
The essence of the method of physics is inseparably connected with the problem of interplay between local and global properties of the universe. In the present paper we discuss this interplay as it is present in three major departments of contemporar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c792c03a2c965ae981031775b4acff59
https://doi.org/10.1023/a:1009691614005
https://doi.org/10.1023/a:1009691614005
Autor:
Jacques Demaret, Christian Scheen
Publikováno v:
Classical and Quantum Gravity. 13:1909-1930
We perform the Painleve test for the Bianchi type-IX homogeneous geometry studied in the Brans - Dicke theoretical framework and considered in the vacuum case. We show that this spatially homogeneous cosmological dynamics is not integrable in the Pai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2f5a60be0c29ce111d1ed9a64708836
https://doi.org/10.1088/0264-9381/13/7/020
https://doi.org/10.1088/0264-9381/13/7/020
Autor:
Jacques Demaret, Christian Scheen
Publikováno v:
Journal of Physics A: Mathematical and General. 29:59-76
We perform the Painleve test (i.e. the Kowalevskaya - Gambier test or the perturbative test) for the perfect fluid Bianchi type-IX relativistic cosmological model, in order to predict some probable chaotic regimes. This technique enables us to detect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a53dbe37173c19036e8d282485b079b9
https://doi.org/10.1088/0305-4470/29/1/009
https://doi.org/10.1088/0305-4470/29/1/009
Publikováno v:
Physical Review D. 48:4595-4603
We analyze the behavior of the Bianchi type-IX cosmological model in the full fourth-order theory of gravity in four space-time dimensions on approach to the singularity both analytically and numerically. By directly analyzing the full fourth-order f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbd66987406f614001656427c94373ae
https://doi.org/10.1103/physrevd.48.4595
https://doi.org/10.1103/physrevd.48.4595
Publikováno v:
International Journal of Modern Physics D. :257-278
The generic cubic contributions to the Lagrangian of gravitation theory are considered. Field equations are determined and put in their simplest form. In the framework of Bianchi I cosmological models with a metric which is power-like in time, algebr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65dcff02f53a4adc2d24ba36df73542f
https://doi.org/10.1142/s0218271893000209
https://doi.org/10.1142/s0218271893000209
Autor:
Y. De Rop, Jacques Demaret
Publikováno v:
Physics Letters B. 299:223-228
Using two different methods, we compute the fractal dimension of the power spectrum associated with numerical solutions of the spatially homogeneous Bianchi IX cosmological model in Misner-Chitre coordinates. According to Perdand's criterion, the non
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc9f26d0ff9148295a421ad026c0729c
https://doi.org/10.1016/0370-2693(93)90252-d
https://doi.org/10.1016/0370-2693(93)90252-d
Publikováno v:
General Relativity and Gravitation. 24:1169-1183
The Einstein-like field equations obtained from the variation of a Lagrangian containing linear, quadratic (Gauss-Bonnet) and quartic terms for a ten-dimensional cosmological model cannot be solved analytically. However, we can reduce them to a syste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b262aa2653b6825b58fd32e6fc77bd3
https://doi.org/10.1007/bf00756991
https://doi.org/10.1007/bf00756991
Publikováno v:
Physical Review D. 41:1163-1171
The correct field equations for several ten-dimensional Lovelock-type Lagrangians including terms up to fourth order in the curvature are given. They were deduced from a program which exploits the facilities of the differential package EXCALC. A firs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3e8be92e0a2a28f003d75f64004d73a
https://doi.org/10.1103/physrevd.41.1163
https://doi.org/10.1103/physrevd.41.1163
Autor:
Jacques Demaret, Elisa Di Pietro
We apply the scale factor duality transformations introduced in the context of the effective string theory to the anisotropic Bianchi-type models. We find dual models for all the Bianchi-types [except for types $VIII$ and $IX$] and construct for each
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf12d877f313d3b7547e413056edcaf2
http://arxiv.org/abs/gr-qc/9903063
http://arxiv.org/abs/gr-qc/9903063
