dorsal/arxiv
View SchemaTest of modified BCS model at finite temperature
| Authors | V. Yu. Ponomarev, A. I. Vdovin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0508047 |
| URL | https://arxiv.org/abs/nucl-th/0508047 |
| DOI | 10.1103/PhysRevC.72.034309 |
| Journal | Phys.Rev. C72 (2005) 034309 |
Abstract
A recently suggested modified BCS (MBCS) model has been studied at finite temperature. We show that this approach does not allow the existence of the normal (non-superfluid) phase at any finite temperature. Other MBCS predictions such as a negative pairing gap, pairing induced by heating in closed-shell nuclei, and ``superfluid -- super-superfluid'' phase transition are discussed also. The MBCS model is tested by comparing with exact solutions for the picket fence model. Here, severe violation of the internal symmetry of the problem is detected. The MBCS equations are found to be inconsistent. The limit of the MBCS applicability has been determined to be far below the ``superfluid -- normal'' phase transition of the conventional FT-BCS, where the model performs worse than the FT-BCS.
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"abstract": "A recently suggested modified BCS (MBCS) model has been studied at finite\ntemperature. We show that this approach does not allow the existence of the\nnormal (non-superfluid) phase at any finite temperature. Other MBCS predictions\nsuch as a negative pairing gap, pairing induced by heating in closed-shell\nnuclei, and ``superfluid -- super-superfluid\u0027\u0027 phase transition are discussed\nalso. The MBCS model is tested by comparing with exact solutions for the picket\nfence model. Here, severe violation of the internal symmetry of the problem is\ndetected. The MBCS equations are found to be inconsistent. The limit of the\nMBCS applicability has been determined to be far below the ``superfluid --\nnormal\u0027\u0027 phase transition of the conventional FT-BCS, where the model performs\nworse than the FT-BCS.",
"arxiv_id": "nucl-th/0508047",
"authors": [
"V. Yu. Ponomarev",
"A. I. Vdovin"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.72.034309",
"journal_ref": "Phys.Rev. C72 (2005) 034309",
"title": "Test of modified BCS model at finite temperature",
"url": "https://arxiv.org/abs/nucl-th/0508047"
},
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