Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Yingfei Gu"'
Autor:
Pengfei Zhang, Yingfei Gu
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 10, Pp 1-16 (2023)
Abstract Under the Heisenberg evolution in chaotic quantum systems, initially simple operators evolve into complicated ones and ultimately cover the whole operator space. We study the growth of the operator “size” in this process, which is relate
Externí odkaz:
https://doaj.org/article/2295c2d29e474c5f8c88131bace6a827
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 3, Pp 1-37 (2022)
Abstract Out-of-time-order correlators (OTOCs) are a standard measure of quantum chaos. Of the four operators involved, one pair may be regarded as a source and the other as a probe. A usual approach, applicable to large-N systems such as the SYK mod
Externí odkaz:
https://doaj.org/article/8bcd5de88e9541d4a515d42776f02fa7
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 3, Pp 1-33 (2021)
Abstract We argue that “stringy” effects in a putative gravity-dual picture for SYK-like models are related to the branching time, a kinetic coefficient defined in terms of the retarded kernel. A bound on the branching time is established assumin
Externí odkaz:
https://doaj.org/article/12ad56f873434c36a7c4e7fc8df863ba
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-74 (2020)
Abstract We describe numerous properties of the Sachdev-Ye-Kitaev model for complex fermions with N ≫ 1 flavors and a global U(1) charge. We provide a general definition of the charge in the (G, Σ) formalism, and compute its universal relation to
Externí odkaz:
https://doaj.org/article/5b6c75d82701455dabc315f9284de8cd
Autor:
Yingfei Gu, Alexei Kitaev
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 2, Pp 1-21 (2019)
Abstract We derive an identity relating the growth exponent of early-time OTOCs, the pre-exponential factor, and a third number called “branching time”. The latter is defined within the dynamical mean-field framework, namely, in terms of the reta
Externí odkaz:
https://doaj.org/article/fb7f9c64da52461fb8d18406d744ff58
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 12, Pp 1-24 (2018)
Abstract We discuss the connections between the complex SYK model at the conformal limit and warped conformal field theories. Both theories have an SL(2, ℝ) × U(1) global symmetry. We present comparisons on symmetries, correlation functions, the e
Externí odkaz:
https://doaj.org/article/dcbf27d67608460e9e6069dbc5f115ac
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 9, Pp 1-44 (2017)
Abstract We study the spread of Rényi entropy between two halves of a Sachdev-Ye-Kitaev (SYK) chain of Majorana fermions, prepared in a thermofield double (TFD) state. The SYK chain model is a model of chaotic many-body systems, which describes a on
Externí odkaz:
https://doaj.org/article/e17a52b8f2ef43c984e062bc221e1755
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 5, Pp 1-37 (2017)
Abstract The Sachdev-Ye-Kitaev model is a (0 + 1)-dimensional model describing Majorana fermions or complex fermions with random interactions. This model has various interesting properties such as approximate local criticality (power law correlation
Externí odkaz:
https://doaj.org/article/6e4ebd4c0c2f4af384af46e85061a871
Publikováno v:
Physical Review Research, Vol 3, Iss 2, p 023044 (2021)
In this paper and its upcoming sequel, we study nonequilibrium dynamics in driven (1+1)-dimensional conformal field theories (CFTs) with periodic, quasiperiodic, and random driving. We study a soluble family of drives in which the Hamiltonian only in
Externí odkaz:
https://doaj.org/article/a9812f9f30044b0685b4e675120918b1
Publikováno v:
Physical Review X, Vol 10, Iss 3, p 031036 (2020)
We study the energy and entanglement dynamics of (1+1)D conformal field theories (CFTs) under a Floquet drive with the sine-square deformed (SSD) Hamiltonian. Previous work has shown that this model supports both a nonheating and a heating phase. Her
Externí odkaz:
https://doaj.org/article/440555aa3a0d43769b99905ea89a5159