scholarly journals Effective action and the quantum equation of motion

2004 ◽  
Vol 36 (2) ◽  
pp. 271-281 ◽  
Author(s):  
V. Branchina ◽  
H. Faivre ◽  
D. Zappalá
Keyword(s):  
Effective Action ◽  
Equation Of Motion ◽  
Quantum Equation

scholarly journals Quantum equation of motion for computing molecular excitation energies on a noisy quantum processor

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Pauline J. Ollitrault ◽  
Abhinav Kandala ◽  
Chun-Fu Chen ◽  
Panagiotis Kl. Barkoutsos ◽  
Antonio Mezzacapo ◽  
...  
Keyword(s):  
Equation Of Motion ◽  
Excitation Energies ◽  
Quantum Equation ◽  
Quantum Processor ◽  
Molecular Excitation

scholarly journals Action Functional for a Particle with Damping

2019 ◽  
Vol 4 (3) ◽  
pp. 81 ◽  
Author(s):  
Federico de Bettin ◽  
Alberto Cappellaro ◽  
Luca Salasnich
Keyword(s):  
Effective Action ◽  
Time Reversal ◽  
Equation Of Motion ◽  
Harmonic Oscillators ◽  
Time Reversal Symmetry ◽  
Action Functional ◽  
Weakly Coupled ◽  
Dissipative Equation

In this brief report we discuss the action functional of a particle with damping, showing that it can be obtained from the dissipative equation of motion through a modification which makes the new dissipative equation invariant for time reversal symmetry. This action functional is exactly the effective action of Caldeira-Leggett model but, in our approach, it is derived without the assumption that the particle is weakly coupled to a bath of infinite harmonic oscillators.

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