English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A model of hybridized bosons and fermions is studied beyond the mean fieldapproximation. The divergent boson self-energy at zero temperature makes theCooper pairing of fermions impossible.The frequency and momentum dependence ofthe self- energy and the condensation temperature $T_{c}$ of initiallylocalized bosons are calculated analytically. The value of the bosoncondensation temperature $T_{c}$ is below $1K$ which rules out theboson-fermion model with the initially localized bosons as a phenomenologicalexplanation of high-temperature superconductivity. The intra-celldensity-density fermion-boson interaction dominates in the fermion self-energy.The model represents a normal metal with strongly damped bosonic excitations.The latter play the role of normal impurities.Comment: 16 pages, Latex, 5 figures available upon reques

Boson - fermion model beyond the mean-field approximation