scholarly journals The generalized Kadanoff-Baym ansatz with initial correlations

2018 ◽  
Vol 98 (11) ◽  
Author(s):  
Daniel Karlsson ◽  
Robert van Leeuwen ◽  
Enrico Perfetto ◽  
Gianluca Stefanucci
Keyword(s):  
Initial Correlations

Nonequilibrium Green’s Functions

2018 ◽  
Author(s):  
Klaus Morawetz
Keyword(s):  
Green’S Function ◽  
Quantum Transport ◽  
Green's Function ◽  
Green's Functions ◽  
Green’S Functions ◽  
Equation Of Motion ◽  
Diagrammatic Technique ◽  
Initial Correlations ◽  
Nonequilibrium Green’S Functions ◽  
Nonequilibrium Green's Functions

The method of the equation of motion is used to derive the Martin–Schwinger hierarchy for the nonequilibrium Green’s functions. The formal closure of the hierarchy is reached by using the selfenergy which provides a recipe for how to construct selfenergies from approximations of the two-particle Green’s function. The Langreth–Wilkins rules for a diagrammatic technique are shown to be equivalent to the weakening of initial correlations. The quantum transport equations are derived in the general form of Kadanoff and Baym equations. The information contained in the Green’s function is discussed. In equilibrium this leads to the Matsubara diagrammatic technique.

scholarly journals Protective effect of chlorpromazine on endotoxin toxicity and TNF production in glucocorticoid-sensitive and glucocorticoid-resistant models of endotoxic shock.

1991 ◽  
Vol 173 (6) ◽  
pp. 1305-1310 ◽  
Author(s):  
M Gadina ◽  
R Bertini ◽  
M Mengozzi ◽  
M Zandalasini ◽  
A Mantovani ◽  
...  
Keyword(s):  
Tumor Necrosis Factor ◽  
Tumor Necrosis ◽  
Actinomycin D ◽  
Protective Action ◽  
Endotoxic Shock ◽  
Serum Levels ◽  
Inhibitory Effect ◽  
Protective Agent ◽  
Initial Correlations ◽  
Necrosis Factor

The present study was designed to define the potential of chlorpromazine (CPZ) as a protective agent against lipopolysaccharide (LPS) toxicity in comparison with glucocorticoids, and to obtain initial correlations with its effects on the levels of tumor necrosis factor (TNF), a pivotal mediator of endotoxic shock. It was found that CPZ protects mice, normal or adrenalectomized, and guinea pigs against lethality of LPS, and inhibited TNF serum levels, like dexamethasone (DEX), a well-known inhibitor of TNF synthesis. CPZ protected against LPS lethality when administered 30 minutes (min) before, simultaneously, or up to 10 min after LPS and was ineffective when given 30 min after LPS, paralleling the inhibitory effect on TNF production. In another experimental model, where mice were sensitized to LPS toxicity by actinomycin D, CPZ significantly inhibited LPS lethality and hepatotoxicity, whereas under these conditions DEX was inactive. These experiments indicate that CPZ has a protective action in both glucocorticoid-sensitive and -resistant models of endotoxic shock.

scholarly journals Initial correlations of the Glasma energy-momentum tensor

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Javier L. Albacete ◽  
Pablo Guerrero-Rodríguez ◽  
Cyrille Marquet
Keyword(s):  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Initial Correlations

scholarly journals Non-Markovianity: initial correlations and nonlinear optical measurements

2012 ◽  
Vol 370 (1972) ◽  
pp. 3658-3671 ◽  
Author(s):  
Arend G. Dijkstra ◽  
Yoshitaka Tanimura
Keyword(s):  
Nonlinear Optics ◽  
Time Evolution ◽  
Response Function ◽  
Nonlinear Optical ◽  
Function Approach ◽  
Nonlinear Optical Response ◽  
Optical Measurements ◽  
Quantum Mechanical ◽  
Initial Correlations ◽  
Correct Understanding

By extending the response function approach developed in nonlinear optics, we analytically derive an expression for the non-Markovianity in the time evolution of a system in contact with a quantum mechanical bath, and find a close connection with the directly observable nonlinear optical response. The result indicates that memory in the bath-induced fluctuations rather than in the dissipation causes non-Markovianity. Initial correlations between states of the system and the bath are shown to be essential for a correct understanding of the non-Markovianity. These correlations are included in our treatment through a preparation function.

scholarly journals Effects of phase shift on bipartite and multipartite correlations of a spin chain under dephasing

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Ai-Xi Chen ◽  
Jian-Song Zhang
Keyword(s):  
Steady State ◽  
Phase Shift ◽  
Analytical Solution ◽  
Spin Chain ◽  
Quantum Discord ◽  
Present Model ◽  
Spin Squeezing ◽  
Heisenberg Chain ◽  
Initial Correlations ◽  
Long Time

AbstractWe investigate the effects of phase shift on entanglement, quantum discord, geometric discord, and spinsqueezing of a Heisenberg chain under dephasing. An analytical solution of the present model is obtained. Our results show that the initial correlations of the spin chain could be partially stored for a long time in the presence of dephasing and the amount of steady state correlations can be adjusted via phase shift. Particularly, we find the effects of phase shift on quantum discord and geometric discord are not always the same, i.e., the increase of geometric discord does not always imply the increase of quantum discord. Then, we calculate the spin-squeezing of the spin chain and find that spin-squeezing first increases with time and then reaches a plateau. The amount of spin-squeezing can be controlled via phase shift.

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