scholarly journals Entanglement dynamics for two-level quantum systems coupled with massive scalar fields

2021 ◽  
pp. 127460
Author(s):  
Yuebing Zhou ◽  
Jiawei Hu ◽  
Hongwei Yu
Keyword(s):  
Scalar Fields ◽  
Quantum Systems ◽  
Massive Scalar ◽  
Entanglement Dynamics

scholarly journals Entanglement dynamics for Unruh-DeWitt detectors interacting with massive scalar fields: the Unruh and anti-Unruh effects

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Yuebing Zhou ◽  
Jiawei Hu ◽  
Hongwei Yu
Keyword(s):  
Time Delay ◽  
Quantum System ◽  
Open Quantum Systems ◽  
Scalar Fields ◽  
Thermal Bath ◽  
Unruh Effect ◽  
Massive Scalar ◽  
Entanglement Dynamics ◽  
The One ◽  
Time Delay Effect

Abstract We study, in the framework of open quantum systems, the entanglement dynamics for a quantum system composed of two uniformly accelerated Unruh-Dewitt detectors interacting with a bath of massive scalar fields in the Minkowski vacuum. We find that the entanglement evolution for the quantum system coupled with massive fields is always slower compared with that of the one coupled with massless fields, and this time-delay effect brought about by the field being massive can however be counteracted by a large enough acceleration, in contrast to the case of a static quantum system in a thermal bath, where this time delay is not affected by the temperature. Remarkably, the maximal concurrence of the quantum system generated during evolution may increase with acceleration for any inter-detector separation while that for static ones in a thermal bath decreases monotonically with temperature, and this can be considered as an anti-Unruh effect in terms of the entanglement generated.

scholarly journals Symmetry and unification from soft theorems and unitarity

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Clifford Cheung ◽  
Zander Moss
Keyword(s):  
Symmetry Algebra ◽  
Scalar Fields ◽  
Particle Interactions ◽  
Massive Scalar ◽  
Coset Space ◽  
Dimensional Theory ◽  
Finite Spectrum ◽  
Physical Constraints ◽  
High Energies ◽  
Zero Condition

Abstract We argue that symmetry and unification can emerge as byproducts of certain physical constraints on dynamical scattering. To accomplish this we parameterize a general Lorentz invariant, four-dimensional theory of massless and massive scalar fields coupled via arbitrary local interactions. Assuming perturbative unitarity and an Adler zero condition, we prove that any finite spectrum of massless and massive modes will necessarily unify at high energies into multiplets of a linearized symmetry. Certain generators of the symmetry algebra can be derived explicitly in terms of the spectrum and three-particle interactions. Furthermore, our assumptions imply that the coset space is symmetric.

scholarly journals Instability of charged massive scalar fields in bound states around Kerr–Sen black holes

2015 ◽  
Vol 24 (14) ◽  
pp. 1550102 ◽  
Author(s):  
Haryanto M. Siahaan
Keyword(s):  
Black Holes ◽  
Bound States ◽  
Gordon Equation ◽  
Scalar Fields ◽  
Bound State ◽  
Imaginary Component ◽  
Scalar Perturbation ◽  
Massive Scalar ◽  
Massive Scalar Field ◽  
Klein Gordon

In this paper, we show the instability of a charged massive scalar field in bound states around Kerr–Sen black holes. By matching the near and far region solutions of the radial part in the corresponding Klein–Gordon equation, one can show that the frequency of bound state scalar fields contains an imaginary component which gives rise to an amplification factor for the fields. Hence, the unstable modes for a charged and massive scalar perturbation in Kerr–Sen background can be shown.

scholarly journals Instability for massive scalar fields in Kerr-Newman spacetime

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
Yang Huang ◽  
Dao-Jun Liu ◽  
Xiang-hua Zhai ◽  
Xin-zhou Li
Keyword(s):  
Scalar Fields ◽  
Massive Scalar

scholarly journals Entanglement dynamics for static two-level atoms in cosmic string spacetime

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Pingyang He ◽  
Hongwei Yu ◽  
Jiawei Hu
Keyword(s):  
Cosmic String ◽  
Minkowski Spacetime ◽  
Scalar Fields ◽  
Entangled State ◽  
Entanglement Dynamics ◽  
Entanglement Generation ◽  
Maximally Entangled State ◽  
Interatomic Separation ◽  
Antisymmetric State ◽  
String Distance

Abstract We study the entanglement dynamics of two static atoms coupled with a bath of fluctuating scalar fields in vacuum in the cosmic string spacetime. Three different alignments of atoms, i.e. parallel, vertical, and symmetric alignments with respect to the cosmic string are considered. We focus on how entanglement degradation and generation are influenced by the cosmic string, and find that they are crucially dependent on the atom-string distance r, the interatomic separation L, and the parameter $$\nu $$ν that characterizes the nontrivial topology of the cosmic string. For two atoms initially in a maximally entangled state, the destroyed entanglement can be revived when the atoms are aligned vertically to the string, which cannot happen in the Minkowski spacetime. When the symmetrically aligned two-atom system is initially in the antisymmetric state, the lifetime of entanglement can be significantly enhanced as $$\nu $$ν increases. For two atoms which are initially in the excited state, when the interatomic separation is large compared to the transition wavelength, entanglement generation cannot happen in the Minkowski spacetime, while it can be achieved in the cosmic string spacetime when the position of the two atoms is appropriate with respect to the cosmic string and $$\nu $$ν is large enough.

Quasi-resonant Modes of Massive Scalar Fields in Schwarzschild–de Sitter Space-Time

2007 ◽  
Vol 46 (10) ◽  
pp. 2617-2625 ◽  
Author(s):  
Jia-Feng Chang ◽  
Juan Huang ◽  
You-Gen Shen
Keyword(s):  
Scalar Fields ◽  
De Sitter Space ◽  
Space Time ◽  
Massive Scalar ◽  
De Sitter ◽  
Resonant Modes

Spontaneous symmetry breaking in the case of massive scalar fields

1977 ◽  
Vol 68 (3) ◽  
pp. 265-266 ◽  
Author(s):  
N.V. Krasnikov ◽  
A.N. Tavkhelidze
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Scalar Fields ◽  
Massive Scalar
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