Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Gérard Clément"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 7, Pp 1-11 (2024)
Abstract We extend the derivation of mass formulas for stationary axisymmetric asymptotically locally flat solutions with string singularities on the polar axis to general supergravity actions containing vector and scalar fields. It is based on the r
Externí odkaz:
https://doaj.org/article/cd06a5674fc84ef5b2e29feeea79a785
Autor:
Gérard Clément, Khireddine Nouicer
Publikováno v:
Physics Letters B, Vol 856, Iss , Pp 138947- (2024)
It is well known that the theory of Cotton gravity proposed by Harada is trivially solved by all isotropic and homogeneous cosmologies. We show that this under-determination is more general. More precisely, the degree of arbitrariness in the solution
Externí odkaz:
https://doaj.org/article/6400e90bbd6b4bfea9a290e8ac4cf058
Autor:
Gérard Clément, Dmitri Gal'tsov
Publikováno v:
Physics Letters B, Vol 845, Iss , Pp 138152- (2023)
In the framework of Einstein-Maxwell theory, we consider collinear arrays of rotating electrically charged black holes connected by Misner-Dirac strings carrying gravimagnetic and magnetic fluxes. The first law of mechanics for these systems is deriv
Externí odkaz:
https://doaj.org/article/92025587ee3f4e05bebd3107ea3e20dc
Autor:
Gérard Clément, Dmitri Gal'tsov
Publikováno v:
Physics Letters B, Vol 838, Iss , Pp 137677- (2023)
It is well-known that traversable wormhole solutions to the Einstein equations require the existence of an exotic matter source violating the null energy condition. An apparent exception is the overcharged Kerr-Newman-NUT solution of the Einstein-Max
Externí odkaz:
https://doaj.org/article/2b5d48df73a8489a81584ec30827fde5
Autor:
Gérard Clément
Publikováno v:
Physics Letters B, Vol 795, Iss , Pp 587-591 (2019)
We report on a two-parameter family of exact asymptotically flat stationary solutions to Einstein-Maxwell theory. These solutions are free from ring singularities in a specific parameter range. They represent systems of two non-rotating extreme black
Externí odkaz:
https://doaj.org/article/ff632b167f1845d0bbff4b4323f8ef6f
Autor:
Gérard Clément, Dmitri Gal'tsov
Publikováno v:
Physics Letters B, Vol 802, Iss , Pp - (2020)
Using the revised Komar-Tomimatsu approach, we derive Smarr mass formulas for stationary axisymmetric solutions of the Einstein-Maxwell equations containing line singularities (defects) on the polar axis. In terms of the rod structure associated with
Externí odkaz:
https://doaj.org/article/62d727f337664873ac7344d330f55027
Autor:
Gérard Clément, Dmitri Gal'tsov
Publikováno v:
Physics Letters B, Vol 773, Iss , Pp 290-294 (2017)
We revisit the derivation by Tomimatsu of the generalized Komar integrals giving the mass and angular momentum of rotating Einstein–Maxwell black holes. We show that, contrary to Tomimatsu's claim, the usual Smarr formula relating the horizon mass
Externí odkaz:
https://doaj.org/article/d5af0a8ce7ff454fa8b2d334f0ee4988
Autor:
Gérard Clément, Dmitri Gal'tsov
Publikováno v:
Physics Letters B, Vol 771, Iss , Pp 457-461 (2017)
We present a one-parameter family of stationary, asymptotically flat solutions of the Einstein–Maxwell equations with only a mild singularity, which are endowed with mass, angular momentum, a dipole magnetic moment and a quadrupole electric moment.
Externí odkaz:
https://doaj.org/article/a41c73fa642944519cc35f20cac983ed
Publikováno v:
Physics Letters B, Vol 750, Iss C, Pp 591-594 (2015)
We revisit the Taub–NUT solution of the Einstein equations without time periodicity condition, showing that the Misner string is still fully transparent for geodesics. In this case, analytic continuation can be carried out through both horizons lea
Externí odkaz:
https://doaj.org/article/9679d7d7755948fabbb44793d3be74dc
Publikováno v:
Physical Review D
Physical Review D, American Physical Society, 2021, 103 (6), pp.064045. ⟨10.1103/PhysRevD.103.064045⟩
Physical Review D, American Physical Society, 2021, 103 (6), pp.064045. ⟨10.1103/PhysRevD.103.064045⟩
We extend the previous analysis of (locally) asymptotically flat solutions of Kaluza-Klein (KK) theory by assuming that the dilaton charge is an independent parameter. This corresponds to a general nondegenerate matrix of charges within the geodesic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8c0d0da412fe8329a2b2cb7dc242cba
https://hal.archives-ouvertes.fr/hal-02959543
https://hal.archives-ouvertes.fr/hal-02959543
