Zobrazeno 1 - 10
of 175
pro vyhledávání: '"Hatefi, Ehsan"'
Publikováno v:
JCAP09 (2024) 015
It is well-known that the critical gravitational collapse produces continuous self-similar solutions characterized by the Choptuik critical exponent, $\gamma$. We examine the solutions in the domains of the linear perturbation equations, considering
Externí odkaz:
http://arxiv.org/abs/2406.04310
Autor:
Hatefi, Armin, Hatefi, Ehsan
Publikováno v:
Eur. Phys. J. C (2023)
This paper investigates the self-similar solutions of the Einstein-axion-dilaton configuration from type IIB string theory and the global SL(2,R) symmetry. We consider the Continuous Self Similarity (CSS), where the scale transformation is controlled
Externí odkaz:
http://arxiv.org/abs/2308.07907
Publikováno v:
JHEP10(2023)034
In this paper, we study the black hole solution of self-similar gravitational collapse in the Einstein-axion-dilaton system for the elliptic class in four dimensions. The solution is invariant under space-time dilation, which is combined with interna
Externí odkaz:
http://arxiv.org/abs/2307.14515
Publikováno v:
Eur. Phys. J. C (2023) 83:623
In this paper, we introduce a numerical method based on Artificial Neural Networks (ANNs) for the analysis of black hole solutions to the Einstein-axion-dilaton system in a high dimensional parabolic class. Leveraging a profile root-finding technique
Externí odkaz:
http://arxiv.org/abs/2302.04619
Autor:
Hatefi, Ehsan, Hatefi, Armin
Publikováno v:
Annals of Physics 446, 2022, 169112
This paper focuses on self-similar gravitational collapse solutions of the Einstein--axion-dilaton configuration for two conjugacy classes of SL(2, R) transformations. These solutions are invariant under spacetime dilation, combined with internal tra
Externí odkaz:
http://arxiv.org/abs/2201.00949
Autor:
Hatefi, Ehsan, Hatefi, Armin
Publikováno v:
Mathematics 2022, 10(23), 4537
The self-similar gravitational collapse solutions to the Einstein-axion-dilaton system have already been found out. Those solutions become invariants after combining the spacetime dilation with the transformations of internal SL(2, R). We apply nonli
Externí odkaz:
http://arxiv.org/abs/2110.07153
Autor:
Hatefi, Ehsan, Sundell, Per
Publikováno v:
JHEP05(2021)245
We compute six-point string amplitudes for the scattering of one closed string Ramond-Ramond state, two tachyons, and two gauge fields in the worldvolume of D-brane-anti-D-brane systems in the Type II superstring theories. From the resulting S-matrix
Externí odkaz:
http://arxiv.org/abs/2103.06302
Autor:
Hatefi, Ehsan, Kuntz, Adrien
Publikováno v:
Eur. Phys. J. C (2021) 81:15
Gravitational critical collapse in the Einstein-axion-dilaton system is known to lead to continuous self-similar solutions characterized by the Choptuik critical exponent $\gamma$. We complete the existing literature on the subject by computing the l
Externí odkaz:
http://arxiv.org/abs/2010.11603
Autor:
Hatefi, Ehsan, Vanzan, Eleonora
Publikováno v:
Eur.Phys.J. C80 (2020) 10, 952
We show that solutions of the self-similar gravitational collapse in the Einstein-axion-dilaton system exist in higher dimensional spacetimes. These solutions are invariant under spacetime dilation combined with internal SL(2,R) transformations. We r
Externí odkaz:
http://arxiv.org/abs/2005.11646
Autor:
Antonelli, Riccardo, Hatefi, Ehsan
Publikováno v:
JHEP 2003 (2020) 180
We explore systematically perturbations of self-similar solutions to the Einstein-axion-dilaton system, whose dynamics are invariant under spacetime dilations combined with internal $SL(2,R)$ transformations. The self-similar solutions capture the en
Externí odkaz:
http://arxiv.org/abs/1912.06103