A unified cosmological dark sector from a Bose–Einstein condensate

Das, Saurya; Sur, Sourav

doi:10.1016/j.dark.2023.101331

Cited by 5 publications

(1 citation statement)

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“…Bose-Einstein condensation (BEC) is a physical phenomenon which has permeated many areas of physics, from condensed matter to cosmology [1]. In particular, some superconductivity theories [2,3] consider Cooper pairs as composite bosons, an assumption that becomes more precise the smaller the correlation length of the pairs is, like in cuprates.…”

Section: Introductionmentioning

confidence: 99%

Two-step BEC coming from a temperature dependent energy gap

Acevedo,

Atala

2024

Preprint

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We report the effects on the thermodynamic properties of a 3D Bose gas caused by a temperature dependent energy gap ∆ (T) at the lower edge of the energy spectrum of the particles constituting the Bose gas which behaves like an ideal Bose gas when the gap is removed. Explicit formulae are given for the critical temperature, the condensate fraction, the internal energy and the isochoric specific heat, which are calculated for three different gaps that abruptly go to zero at temperature TB, as well as for the damped counterparts whose drop to zero we have smoothed. In particular, for the undamped BCS (Bardeen, Cooper and Schrieffer) gap it is observed that the Bose-Einstein condensation (BEC) critical temperature Tc is equal to that of the ideal Bose gas T0, for all TB ≤ T0; surprisingly, the condensate fraction presents two different filling rates of the ground state at Tc = T0 and at TB < T0 while the specific heat shows a finite jump at Tc as well as a divergence at TB. Three-dimensional infinite Bose gas results are recovered when the temperature independent gap is either a constant or equal to zero. PACS numbers: 03.75.Fi; 05.30.Jp; 67.40.Kh

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Section: Introductionmentioning

confidence: 99%