Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Katsuta Sakai"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-30 (2024)
Abstract The generalized Lefschetz thimble method is a promising approach that attempts to solve the sign problem in Monte Carlo methods by deforming the integration contour using the flow equation. Here we point out a general problem that occurs due
Externí odkaz:
https://doaj.org/article/e3a0eed0b72f46fb85ed2dd320004d2e
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 9, Pp 1-34 (2023)
Abstract It is well known that quantum tunneling can be described by instantons in the imaginary-time path integral formalism. However, its description in the real-time path integral formalism has been elusive. Here we establish a statement that quan
Externí odkaz:
https://doaj.org/article/fbbd2471ff1b48d3beb00abc353871a0
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 4, Pp 1-27 (2022)
Abstract The Picard-Lefschetz theory has been attracting much attention as a tool to evaluate a multi-variable integral with a complex weight, which appears in various important problems in theoretical physics. The idea is to deform the integration c
Externí odkaz:
https://doaj.org/article/83702d3d60074b7dbfa978f01756f2b9
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 4, Pp 1-18 (2020)
Abstract We study non-perturbative quantum aspects of T T ¯ $$ T\overline{T} $$ -deformation of a free O(N ) vector model by employing the large N limit. It is shown that bound states of the original field appear and inevitably become negative-norm
Externí odkaz:
https://doaj.org/article/e07fcc4b53494f9e89fefc1fc50ecfbc
Publikováno v:
Nuclear Physics B, Vol 971, Iss , Pp 115499- (2021)
We study a TT¯-deformed O(N) vector model, which is classically equivalent to the Nambu-Goto action with static gauge. The thermal free energy density can be computed exactly by using the Burgers equation as a special property of TT¯-deformation. T
Externí odkaz:
https://doaj.org/article/10ee0fed2a004c6592aa9d1ef2f9cf05
Autor:
Katsuta Sakai
Publikováno v:
Nuclear Physics B, Vol 949, Iss , Pp - (2019)
We study the IIB matrix model in an interpretation where the matrices are differential operators defined on curved spacetimes. In this interpretation, coefficients of higher derivative operators formally appear to be massless higher spin fields. In t
Externí odkaz:
https://doaj.org/article/a7514f0dae0f441597bdff8411024ef0
Autor:
Kiyoharu Kawana, Katsuta Sakai
Publikováno v:
Physics Letters B, Vol 778, Iss C, Pp 60-63 (2018)
Recently a new inflationary scenario was proposed in [1] which can be applicable to an inflaton having multiple vacua. In this letter, we consider a more general situation where the inflaton potential has a (UV) saddle point around the Planck scale.
Externí odkaz:
https://doaj.org/article/c594703f304d4ff9998918f22f57b4c6
Autor:
Katsuta Sakai
Publikováno v:
Nuclear Physics B, Vol 925, Iss , Pp 195-211 (2017)
The IIB matrix model is one of the candidates for nonperturbative formulation of string theory, and it is believed that the model contains gravitational degrees of freedom in some manner. In some preceding works, it was proposed that the matrix model
Externí odkaz:
https://doaj.org/article/002577bc251244c984677c2d007cc198
Publikováno v:
Symmetry, Vol 13, Iss 7, p 1221 (2021)
This is a continuation of our previous works on entanglement entropy (EE) in interacting field theories. In previous papers, we have proposed the notion of ZM gauge theory on Feynman diagrams to calculate EE in quantum field theories and shown that E
Externí odkaz:
https://doaj.org/article/ef82b4a32a0d47f18bd773d2c16a8500
Publikováno v:
Symmetry
Volume 13
Issue 7
Symmetry, Vol 13, Iss 1221, p 1221 (2021)
Volume 13
Issue 7
Symmetry, Vol 13, Iss 1221, p 1221 (2021)
This is a continuation of our previous works on entanglement entropy (EE) in interacting field theories. In arXiv:2103.05303, we have proposed the notion of $\mathbb{Z}_M$ gauge theory on Feynman diagrams to calculate EE in quantum field theories and