Márk Mezei
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View article: The entanglement membrane in 2d CFT: reflected entropy, RG flow, and information velocity
The entanglement membrane in 2d CFT: reflected entropy, RG flow, and information velocity Open
A bstract The time evolution of entanglement entropy in generic chaotic many-body systems has an effective description in terms of a minimal membrane, characterised by a tension function. For 2d CFTs, a degenerate tension function reproduc…
View article: New horizons for inhomogeneous quenches and Floquet CFT
New horizons for inhomogeneous quenches and Floquet CFT Open
A bstract A fruitful avenue in investigating out-of-equilibrium quantum many-body systems is to abruptly change their Hamiltonian and study the subsequent evolution of their quantum state. If this is done once, the setup is called a quench…
View article: Nonlinear soft mode action for the large-p SYK model
Nonlinear soft mode action for the large-p SYK model Open
A bstract The physics of the SYK model at low temperatures is dominated by a soft mode governed by the Schwarzian action. In [1] the linearised action was derived from the soft mode contribution to the four-point function, and physical arg…
View article: Nonlinear soft mode action for the large-$p$ SYK model
Nonlinear soft mode action for the large-$p$ SYK model Open
The physics of the SYK model at low temperatures is dominated by a soft mode governed by the Schwarzian action. In arXiv:1604.07818 the linearised action was derived from the soft mode contribution to the four-point function, and physical …
View article: The entanglement membrane in 2d CFT: reflected entropy, RG flow, and information velocity
The entanglement membrane in 2d CFT: reflected entropy, RG flow, and information velocity Open
The time evolution of entanglement entropy in generic chaotic many-body systems has an effective description in terms of a minimal membrane, characterised by a tension function. For 2d CFTs, a degenerate tension function reproduces several…
View article: On the non-perturbative bulk Hilbert space of JT gravity
On the non-perturbative bulk Hilbert space of JT gravity Open
A bstract What is the bulk Hilbert space of quantum gravity? In this paper, we resolve this problem in 2 d JT gravity, both with and without matter, providing an explicit definition of a non-perturbative Hilbert space specified in terms of…
View article: New horizons for inhomogeneous quenches and Floquet CFT
New horizons for inhomogeneous quenches and Floquet CFT Open
A fruitful avenue in investigating out-of-equilibrium quantum many-body systems is to abruptly change their Hamiltonian and study the subsequent evolution of their quantum state. If this is done once, the setup is called a quench, while if…
View article: On the non-perturbative bulk Hilbert space of JT gravity
On the non-perturbative bulk Hilbert space of JT gravity Open
What is the bulk Hilbert space of quantum gravity? In this paper, we resolve this problem in 2d JT gravity, both with and without matter, providing an explicit definition of a non-perturbative Hilbert space specified in terms of metric var…
View article: Phases of Wilson lines: conformality and screening
Phases of Wilson lines: conformality and screening Open
A bstract We study the rich dynamics resulting from introducing static charged particles (Wilson lines) in 2+1 and 3+1 dimensional gauge theories. Depending on the charges of the external particles, there may be multiple defect fixed point…
View article: Phases of Wilson Lines: Conformality and Screening
Phases of Wilson Lines: Conformality and Screening Open
We study the rich dynamics resulting from introducing static charged particles (Wilson lines) in 2+1 and 3+1 dimensional gauge theories. Depending on the charges of the external particles, there may be multiple defect fixed points with int…
View article: Phases of Wilson Lines in Conformal Field Theories
Phases of Wilson Lines in Conformal Field Theories Open
We study the low-energy limit of Wilson lines (charged impurities) in conformal gauge theories in 2+1 and 3+1 dimensions. As a function of the representation of the Wilson line, certain defect operators can become marginal, leading to inte…
View article: Effective description of sub-maximal chaos: stringy effects for SYK scrambling
Effective description of sub-maximal chaos: stringy effects for SYK scrambling Open
A bstract It has been proposed that the exponential decay and subsequent power law saturation of out-of-time-order correlation functions can be universally described by collective ‘scramblon’ modes. We develop this idea from a path integra…
View article: Effective description of sub-maximal chaos: stringy effects for SYK scrambling
Effective description of sub-maximal chaos: stringy effects for SYK scrambling Open
It has been proposed that the exponential decay and subsequent power law saturation of out-of-time-order correlation functions can be universally described by collective 'scramblon' modes. We develop this idea from a path integral perspect…
View article: Phases of Wilson Lines in Conformal Field Theories
Phases of Wilson Lines in Conformal Field Theories Open
We study the low-energy limit of Wilson lines (charged impurities) in conformal gauge theories in 2+1 and 3+1 dimensions. As a function of the representation of the Wilson line, certain defect operators can become marginal, leading to inte…
View article: Snowmass Theory Frontier: Effective Field Theory
Snowmass Theory Frontier: Effective Field Theory Open
We summarize recent progress in the development, application, and understanding of effective field theories and highlight promising directions for future research. This Report is prepared as the TF02 "Effective Field Theory" topical group …
View article: The volume of the black hole interior at late times
The volume of the black hole interior at late times Open
A bstract Understanding the fate of semi-classical black hole solutions at very late times is one of the most important open questions in quantum gravity. In this paper, we provide a path integral definition of the volume of the black hole…
View article: On entanglement spreading from holography
On entanglement spreading from holography Open
A global quench is an interesting setting where we can study thermalization of subsystems in a pure state. We investigate entanglement entropy (EE) growth in global quenches in holographic field theories and relate some of its aspects to q…
View article: Snowmass White Paper: Effective Field Theories for Condensed Matter Systems
Snowmass White Paper: Effective Field Theories for Condensed Matter Systems Open
We review recent progress and a number of future directions for applications of effective field theory methods to condensed matter systems broadly defined. Our emphasis is on areas that have allowed a fertile exchange of ideas between high…
View article: The volume of the black hole interior at late times
The volume of the black hole interior at late times Open
Understanding the fate of semi-classical black hole solutions at very late times is one of the most important open questions in quantum gravity. In this paper, we provide a path integral definition of the volume of the black hole interior …
View article: Black Holes Often Saturate Entanglement Entropy the Fastest
Black Holes Often Saturate Entanglement Entropy the Fastest Open
There is a simple bound on how fast the entanglement entropy of a subregion of a many-body quantum system can saturate in a quench: t_{sat}≥R/v_{B}, where t_{sat} is the saturation time, R the radius of the largest inscribed sphere, and v_…
View article: Chaos in the butterfly cone
Chaos in the butterfly cone Open
A bstract A simple probe of chaos and operator growth in many-body quantum systems is the out of time ordered four point function. In a large class of local systems, the effects of chaos in this correlator build up exponentially fast insid…
View article: Bit Threads and the Membrane Theory of Entanglement Dynamics
Bit Threads and the Membrane Theory of Entanglement Dynamics Open
Recently, an effective {\\it membrane theory} was proposed that describes the\n``hydrodynamic'' regime of the entanglement dynamics for general chaotic\nsystems. Motivated by the new {\\it bit threads} formulation of holographic\nentanglem…
View article: KdV charges in TTbar theories and new models with super-Hagedorn behavior
KdV charges in TTbar theories and new models with super-Hagedorn behavior Open
Two-dimensional CFTs and integrable models have an infinite set of conserved KdV higher spin currents. These currents can be argued to remain conserved under the T\bar{T} deformation and its generalizations. We determine the flow equ…