# From resonantly interacting fermions with effective range to neutron matter

Abstract : A density functional theory is proposed for strongly interacting fermions with arbitrary large negative scattering length. The functional has only two parameters that are directly fixed to reproduce the universal properties of unitary gas: the so-called "Bertsch parameter" $\xi_0$ and a parameter $\eta_e$ related to the possible influence of the effective range $r_e$ at infinite scattering length $a$. Using most recent quantum Monte-Carlo (QMC) estimates of these two parameters, it is shown that the functional properly reproduces the experimental measurements of interacting Fermi systems not only at unitarity but also away from this limit over a wide range of $(ak_F)^{-1}$ values. The functional is applied to obtain an expression of the Tan's contact parameter including the effect of $r_e$. Application is finally made to neutron matter. It is shown that most recent QMC results are well reproduced.
Type de document :
Pré-publication, Document de travail
2016

http://hal.in2p3.fr/in2p3-01361535
Contributeur : Sophie Heurteau <>
Soumis le : mercredi 7 septembre 2016 - 14:18:29
Dernière modification le : jeudi 11 janvier 2018 - 06:12:41

### Identifiants

• HAL Id : in2p3-01361535, version 1
• ARXIV : 1608.08411

### Citation

D. Lacroix. From resonantly interacting fermions with effective range to neutron matter. 2016. 〈in2p3-01361535〉

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