Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Georgios Pastras"'
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 3, Pp 1-26 (2021)
Abstract We apply the dressing method on the Non Linear Sigma Model (NLSM), which describes the propagation of strings on ℝ × S2, for an arbitrary seed. We obtain a formal solution of the corresponding auxiliary system, which is expressed in terms
Externí odkaz:
https://doaj.org/article/4f2cbdd6d7894eb6bda7a3a6c98ee2a6
Autor:
Dimitrios Katsinis, Georgios Pastras
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-60 (2020)
Abstract We study the entanglement entropy and the mutual information in coupled harmonic systems at finite temperature. Interestingly, we find that the mutual information does not vanish at infinite temperature, but it rather reaches a specific fini
Externí odkaz:
https://doaj.org/article/f41262f92d6645b0b02e993acbd729fd
Autor:
Panagiotis Stavropoulos, Georgios Pastras, Thanassis Souflas, Konstantinos Tzimanis, Harry Bikas
Publikováno v:
Metals, Vol 12, Iss 11, p 1853 (2022)
Laser-Based Powder Bed Fusion is one of the most widely used additive manufacturing processes, mainly due to its high-quality output. End users would greatly benefit from a virtual simulation of the process; however, the modelling of the process is v
Externí odkaz:
https://doaj.org/article/f677f446818843a78c90ea8c10558525
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 10, Pp 1-41 (2019)
Abstract We study several physical aspects of the dressed elliptic strings propagating on $$\mathbb {R} \times \mathrm {S}^2$$ R×S2 and of their counterparts in the Pohlmeyer reduced theory, i.e. the sine-Gordon equation. The solutions are divided i
Externí odkaz:
https://doaj.org/article/277029452e8846799be82ea6f6fdd8a3
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 9, Pp 1-20 (2019)
Abstract The dressing method is a technique to construct new solutions in non-linear sigma models under the provision of a seed solution. This is analogous to the use of autoBäcklund transformations for systems of the sine-Gordon type. In a recent w
Externí odkaz:
https://doaj.org/article/d62e5f851576473c80d634857c941b36
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-20 (2018)
Abstract We study classical string solutions on $$\mathbb {R}\times \hbox {S}^2$$ R×S2 that correspond to elliptic solutions of the sine-Gordon equation. In this work, these solutions are systematically derived by inverting the Pohlmeyer reduction.
Externí odkaz:
https://doaj.org/article/524105ba0ce841be99fde807d6c23eea
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-24 (2018)
Abstract We obtain classical string solutions on $$\mathbb {R}^t \times \hbox {S}^2$$ Rt×S2 by applying the dressing method on string solutions with elliptic Pohlmeyer counterparts. This is realized through the use of the simplest possible dressing
Externí odkaz:
https://doaj.org/article/a6ff3308f7cb4160b583c9a282c26804
Autor:
Dimitrios Katsinis, Georgios Pastras
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 4, Pp 1-18 (2018)
Abstract We extend the entanglement entropy calculation performed in the seminal paper by Srednicki (Phys Rev Lett 71:666, 1993) for free real massive scalar field theories in $$1+1$$ 1+1 , $$2+1$$ 2+1 and $$3+1$$ 3+1 dimensions. We show that the inv
Externí odkaz:
https://doaj.org/article/72e3bf9211e4460f83650beaacb1052c
Autor:
Georgios Pastras
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 11, Pp 1-23 (2017)
Abstract The Ryu–Takayanagi conjecture connects the entanglement entropy in the boundary CFT to the area of open co-dimension two minimal surfaces in the bulk. Especially in $$\hbox {AdS}_4$$ AdS 4 , the latter are two-dimensional surfaces, and, th
Externí odkaz:
https://doaj.org/article/77277c200c104914835ede31eda73bad
Autor:
Ioannis Bakas, Georgios Pastras
Publikováno v:
Nuclear Physics B, Vol 896, Iss C, Pp 440-469 (2015)
Small variations of the entanglement entropy δS and the expectation value of the modular Hamiltonian δE are computed holographically for circular entangling curves in the boundary of AdS4, using gravitational perturbations with general boundary con
Externí odkaz:
https://doaj.org/article/a05fbaa9a4c54bc8a8198a763a142512