scholarly journals A notion of entropy for causal fermion systems

2021 ◽  
Vol 111 (5) ◽  
Author(s):  
Felix Finster
Keyword(s):  
Fermion Systems

scholarly journals Unusual Al27 NMR shift in the Weyl-fermion systems LaAlGe and PrAlGe

2020 ◽  
Vol 102 (24) ◽  
Author(s):  
D. Tay ◽  
T. Shang ◽  
P. Puphal ◽  
E. Pomjakushina ◽  
H.-R. Ott ◽  
...  
Keyword(s):  
Fermion Systems ◽  
Weyl Fermion

scholarly journals Many-body entanglement in fermion systems

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
N. Gigena ◽  
M. Di Tullio ◽  
R. Rossignoli
Keyword(s):  
Many Body ◽  
Fermion Systems

FIRST-ORDER APPROXIMATION OF THE NUMBER-PROJECTED SO(2N) TAMM-DANCOFF EQUATION AND ITS REDUCTION BY THE SCHUR FUNCTION

1999 ◽  
Vol 08 (05) ◽  
pp. 461-483
Author(s):  
SEIYA NISHIYAMA
Keyword(s):  
Wave Function ◽  
Order Approximation ◽  
Approximate Equation ◽  
Variation Principle ◽  
Schur Function ◽  
Soliton Theory ◽  
First Order ◽  
Fermion Systems ◽  
Group Manifold ◽  
First Order Approximation

First-order approximation of the number-projected (NP) SO(2N) Tamm-Dancoff (TD) equation is developed to describe ground and excited states of superconducting fermion systems. We start from an NP Hartree-Bogoliubov (HB) wave function. The NP SO(2N) TD expansion is generated by quasi-particle pair excitations from the degenerate geminals in the number-projected HB wave function. The Schrödinger equation is cast into the NP SO(2N) TD equation by the variation principle. We approximate it up to first order. This approximate equation is reduced to a simpler form by the Schur function of group characters which has a close connection with the soliton theory on the group manifold.

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