Unruh effect and information flow

Abstract

We study memory effects as information backflow for an accelerating two-level detector weakly interacting with a scalar field in the Minkowski vacuum. This is the framework of the well-known Unruh effect: the detector behaves as if it were in a thermal bath with a temperature proportional to its acceleration. Here we show that if we relax the usual assumption of an eternally uniformly accelerating system, and we instead consider the more realistic case in which a finite-size detector starts accelerating at a certain time, information backflow may appear in the dynamics. Our results demonstrate the existence of a connection between the trajectory of the detector in Minkowski space and the behavior of information flow. This allows us to inspect the Unruh effect under a new light, making use of the latest developments in quantum information theory and open quantum systems.

Rotating effects on the scalar field in the cosmic string spacetime, in the spacetime with space-like dislocation and in the spacetime with a spiral dislocation

“…Note that this topological defect has a curvature concentrated only on the cosmic string axis, i.e., the curvature tensor is given by R ρ,ϕ ρ,ϕ = 1−α 4α δ 2 ( r), where δ 2 ( r) is the two-dimensional delta function [15]. Besides, the parameter α is defined in the range 0 < α < 1.…”

“…In this interface between general relativity and quantum mechanics, it is interesting to search for the effects associated with rotation and the topology of the spacetime. Cosmic strings [11][12][13][14] are linear topological defects in the spacetime characterized by a conical singularity [15]. This singularity is determined by the curvature concentrated on the symmetry axis of the cosmic string.…”

Non-relativistic quantum effects on the harmonic oscillator in a spacetime with a distortion of a vertical line into a vertical spiral

“…It has a singularity determined by the curvature concentrated on its symmetry axis. It is known as a conical singularity [5]. Interesting works [6][7][8][9][10][11][12][13][14][15][16][17] have explored this topological characteristic of the cosmic string with the purpose of searching for analogues of the Aharonov-Bohm effect [18,19].…”

Effects of rotation in the spacetime with the distortion of a vertical line into a vertical spiral

“…The possibility of arising topological defects from phase transitions during the universe evolution has raised discussions about spacetimes characterized by the presence of torsion and curvature. The best known example is the cosmic string spacetime [1][2][3][4][5][6][7]. In connection with the description of topological defects in solids [8,9], it has been considered spacetimes with a screw dislocation [6,10,11] and a spiral dislocation [11][12][13].…”