scholarly journals Phase transitions triggered by quantum fluctuations in the inflationary universe

1992 ◽  
Vol 370 (2) ◽  
pp. 472-490 ◽  
Author(s):  
Michiyasu Nagasawa ◽  
Jun'ichi Yokoyama
Keyword(s):  
Phase Transitions ◽  
Quantum Fluctuations ◽  
Inflationary Universe

CLASSICAL PERTURBATIONS FROM DECOHERENCE OF QUANTUM FLUCTUATIONS IN THE INFLATIONARY UNIVERSE

1990 ◽  
Vol 05 (28) ◽  
pp. 2311-2317 ◽  
Author(s):  
ROBERT BRANDENBERGER ◽  
RAYMOND LAFLAMME ◽  
MILAN MIJIĆ
Keyword(s):  
Scalar Field ◽  
Coherence Length ◽  
Quantum Fluctuations ◽  
Inflationary Universe ◽  
De Sitter ◽  
Density Perturbations ◽  
Hubble Radius ◽  
Universe Models

The evolution of a scalar field interacting with an environment in the de Sitter phase of an inflationary Universe is studied. The environment is taken to be a second scalar field. It is shown that the coherence length of the quantum fluctuations rapidly decreases after the wavelength of the perturbation crosses the Hubble radius. Hence, the fluctuations can be interpreted as classical. This lends support to the usual derivation of the spectrum of density perturbations in inflationary Universe models.

Local quantum Fisher information and one-way quantum deficit in spin-1/2 XX Heisenberg chain with three-spin interaction

2020 ◽  
Vol 18 (04) ◽  
pp. 2050016 ◽  
Author(s):  
Biao-Liang Ye ◽  
Bo Li ◽  
Xiao-Bin Liang ◽  
Shao-Ming Fei
Keyword(s):  
Phase Transitions ◽  
Fisher Information ◽  
Quantum Phase Transitions ◽  
Quantum Fisher Information ◽  
Quantum Fluctuations ◽  
Quantum Phase ◽  
Spin Interaction ◽  
Heisenberg Chain ◽  
Analytical Results ◽  
Local Quantum

We explore quantum phase transitions in the spin-1/2 [Formula: see text] chain with three-spin interaction in terms of local quantum Fisher information and one-way quantum deficit, together with the demonstration of quantum fluctuations. Analytical results are derived and analyzed in detail.

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