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BEC-BCS Crossover in Neutron Matter with Renormalization Group based Effective Interactions

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arxiv 1308.0939 v2 pith:UI4VJLSV submitted 2013-08-05 nucl-th cond-mat.quant-gascond-mat.str-el

BEC-BCS Crossover in Neutron Matter with Renormalization Group based Effective Interactions

classification nucl-th cond-mat.quant-gascond-mat.str-el
keywords matterinteractionsneutronbec-bcscrossovergrouprenormalizationallows
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study pure neutron matter in the BEC-BCS crossover regime using renormalization group based low-momentum interactions within the Nozi\`eres-Schmitt-Rink framework. This is an attempt to go beyond the mean field description for low-density matter. We work in the basis of so-called Weinberg eigenvectors where the operator $G_0V$ is diagonal, which proves to be an excellent choice that allows one to use non-local interactions in a very convenient way. We study the importance of correlations as a function of density. We notice that there is a significant reduction of the BCS critical temperature at low-densities as the neutron matter approaches the unitary limit.

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