Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Compt. rend.

EXTENSION OF THE NOTIONS OF CORRELATION FUNCTION AND SPECTRAL DENSITY TO A QUANTUM VARIABLE

Yves Ayant

Published Mar 1, 1954• 0 citations
OpenAlex

Related papers

SPECTRAL DENSITY TECHNIQUE IN QUANTUM STATISTICS.

O. K. Kalashnikov, E.S. Fradkin

•Jan 1, 1968•0 citations

UNIFIED THEORY OF VARIABLE TIME DENSITY (VTD)SPECIAL ADDENDUM: QUANTUM SYNTHESISSUBJECT: HIGGS MECHANISM, INFINITE SPEED AND THE NATURE OF ENTANGLEMENT

Bauyrzhan Nartbaevich Tazhibayev

This paper continues the construction of the Unified VTD Theory, bridging cosmological scales (Part I) and wave processes (Part II) with quantum mechanics. For the first time, a physical identification of the time field is proposed: the Higgs Field is treated as the carrier of Time Density (T). Mass is interpreted not as an intrinsic property of matter, but as the result of "chronal viscosity" – the resistance of the medium to motion. The concept of the "Zero Layer" (T=0) is introduced, explaining the phenomenon of Quantum Entanglement as an interaction at infinite speed within a medium devoid of temporal resistance. The work offers a resolution to the fundamental conflict between locality (General Relativity) and non-locality (Quantum Mechanics).

•Jan 16, 2026•0 citations

The Method of Spectral Densities in Quantum Statistical Mechanics

O. K. Kalashnikov, Efim S. Fradkin

Journal of Experimental and Theoretical Physics•Feb 1, 1969•4 citations

DENSITY-MATRIX RENORMALISATION GROUP FOR DYNAMIC CORRELATION FUNCTIONS

Eric Jeckelmann

The calculation of dynamic correlation functions in quantum systems is formulated as a variational problem. For low-dimensional many-body systems this variational problem can be solved numerically using the density-matrix renormalisation group (DMRG). This dynamic DMRG method is demonstrated on the linear optical conductivity in the Mott insulating phase of the one-dimensional extended Hubbard model at half filling. The full optical spectrum of this model can be calculated almost exactly for chains with more than 100 sites, which is large enough to investigate the spectral properties in the thermodynamic limit. The accuracy of the method is illustrated by comparison with analytical results in the field-theoretical regime and in the strong-coupling limit.

International Journal of Modern Physics B•Nov 10, 2003•0 citations

Correlation function on quantum phase space

J. L. Parish

Physics Letters A•Oct 1, 1988•0 citations

THE DENSITY OPERATOR AND ITS ROLE IN QUANTUM STATISTICS

WORLD SCIENTIFIC eBooks•Mar 1, 2007•0 citations
This paper continues the construction of the Unified VTD Theory, bridging cosmological scales (Part I) and wave processes (Part II) with quantum mechanics. For the first time, a physical identification of the time field is proposed: the Higgs Field is treated as the carrier of Time Density (T). Mass is interpreted not as an intrinsic property of matter, but as the result of "chronal viscosity" – the resistance of the medium to motion. The concept of the "Zero Layer" (T=0) is introduced, explaining the phenomenon of Quantum Entanglement as an interaction at infinite speed within a medium devoid of temporal resistance. The work offers a resolution to the fundamental conflict between locality (General Relativity) and non-locality (Quantum Mechanics).
The calculation of dynamic correlation functions in quantum systems is formulated as a variational problem. For low-dimensional many-body systems this variational problem can be solved numerically using the density-matrix renormalisation group (DMRG). This dynamic DMRG method is demonstrated on the linear optical conductivity in the Mott insulating phase of the one-dimensional extended Hubbard model at half filling. The full optical spectrum of this model can be calculated almost exactly for chains with more than 100 sites, which is large enough to investigate the spectral properties in the thermodynamic limit. The accuracy of the method is illustrated by comparison with analytical results in the field-theoretical regime and in the strong-coupling limit.