scholarly journals Thermofield Theory for Finite-Temperature Coupled Cluster

2019 ◽  
Vol 15 (11) ◽  
pp. 6127-6136 ◽  
Author(s):  
Gaurav Harsha ◽  
Thomas M. Henderson ◽  
Gustavo E. Scuseria
Keyword(s):  
Finite Temperature ◽  
Coupled Cluster

scholarly journals Conservation laws in coupled cluster dynamics at finite temperature

2021 ◽  
Vol 155 (4) ◽  
pp. 044103
Author(s):  
Ruojing Peng ◽  
Alec F. White ◽  
Huanchen Zhai ◽  
Garnet Kin-Lic Chan
Keyword(s):  
Conservation Laws ◽  
Finite Temperature ◽  
Coupled Cluster

A FINITE-TEMPERATURE GENERALISATION OF THE COUPLED CLUSTER METHOD: A NON-PERTURBATIVE ACCESS TO GRAND PARTITION FUNCTIONS

2003 ◽  
Vol 17 (28) ◽  
pp. 5367-5377 ◽  
Author(s):  
SEIKH HANNAN MANDAL ◽  
RATHINDRANATH GHOSH ◽  
GOUTAM SANYAL ◽  
DEBASHIS MUKHERJEE
Keyword(s):  
Free Energy ◽  
Finite Temperature ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Partition Functions ◽  
Coupled Cluster Method ◽  
Grand Partition Function ◽  
Free Energies ◽  
Anharmonic Oscillators ◽  
Lipkin Model

We present here a succinct account of the finite-temperature generalisation of the coupled cluster (CC) method. It requires the concept of thermal normal ordered products whose Boltzmann trace is zero. The basic idea is to express the Boltzmann operator as a normal ordered exponential containing cluster operators and a number, and express the free energy as a logarithm of a suitable Boltzmann trace, where only the number part in the ordered exponential survives. The free energy is manifestly extensive. Free energies of Lipkin model and anharmonic oscillators obtained from the grand partition function are discussed as example applications.

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