Quantum Entropy Bound by Information in Black Hole Spacetime

德西特时空中的随机暴胀与熵界

Stochastic inflation and entropy bound in de Sitter spacetime

针对德西特时空永恒暴胀阶段熵界违反全息原理的问题，采用随机暴胀方法，通过分析暴胀子场体积加权概率分布的Shannon熵，揭示了德西特时空的特殊熵行为。

二维Rindler时空中的相对费米熵

The Relative Fermionic Entropy in Two-Dimensional Rindler Spacetime

本文研究了二维Rindler时空中的费米相对熵，结合模理论和单粒子密度算子，推导出一般高斯态的相对熵公式，并应用于非幺正激发的计算。

The Holographic Entropy Cone in AdS-Vaidya Spacetimes

We examine the five-region holographic entropy cone inequalities for the special case of the AdS$_3$-Vaidya metric for a variety of boundary configurations. This is done by numerically solving the geodesic equation in the bulk for various boundary configurations. In all the cases we examine, we find that all the inequalities are satisfied when the bulk satisfies the null energy condition, while the inequalities are all violated when the bulk spacetime violates the null energy condition. A proof of the five-region holographic entropy cone inequalities for the dynamical bulk case remains an open…

Notes on Spacetime Thermodynamics and the Observer-dependence of Entropy

Due to the Unruh effect, accelerated and inertial observers differ in their description of a given quantum state. The implications of this effect are explored for the entropy assigned by such observers to localized objects that may cross the associated Rindler horizon. It is shown that the assigned entropies differ radically in the limit where the number of internal states $n$ becomes large. In particular, the entropy assigned by the accelerated observer is a bounded function of $n$. General arguments are given along with explicit calculations for free fields. The implications for discussions …

Holography and Entanglement in Flat Spacetime

We propose a holographic correspondence of the flat spacetime based on the behavior of the entanglement entropy and the correlation functions. The holographic dual theory turns out to be highly non-local. We argue that after most part of the space is traced out, the reduced density matrix gives the maximal entropy and the correlation functions become trivial. We present a toy model for this holographic dual using a non-local scalar field theory that reproduces the same property of the entanglement entropy. Our conjecture is consistent with the entropy of Schwarzschild black holes in asymptotic…

Generalized Quantum Theory in Evaporating Black Hole Spacetimes

Quantum mechanics for matter fields moving in an evaporating black hole spacetime is formulated in fully four-dimensional form according to the principles of generalized quantum theory. The resulting quantum theory cannot be expressed in a 3+1 form in terms of a state evolving unitarily or by reduction through a foliating family of spacelike surfaces. That is because evaporating black hole geometries cannot be foliated by a non-singular family of spacelike surfaces. A four-dimensional notion of information is reviewed. Although complete information may not be available on every spacelike surfa…