The unitary Fermi gas at large charge and large N

Bibliographic Details
Title: The unitary Fermi gas at large charge and large N
Authors: Hellerman, Simeon, Krichevskiy, Daniil, Orlando, Domenico, Pellizzani, Vito, Reffert, Susanne, Swanson, Ian
Publication Year: 2023
Collection: Condensed Matter
High Energy Physics - Theory
Subject Terms: High Energy Physics - Theory, Condensed Matter - Quantum Gases
More Details: We study the unitary Fermi gas in a harmonic trapping potential starting from a microscopic theory in the limit of large charge and large number of fermion flavors N. In this regime, we present an algorithmic procedure for extracting data from perturbation theory, order-by-order, without the need for other assumptions. We perform a gradient expansion in the interior of the particle cloud, sufficiently far from the cloud edge where the particle density drops rapidly to zero. In this latter region we present the first microscopic computation characterizing the contribution of the edge terms. The microscopic theory reproduces the predictions of the superfluid EFT, including the action, the form of the gap equation, and the energy of the system in a harmonic trap (which maps, via the non-relativistic state-operator correspondence, to the scaling dimension of the lowest operator of charge Q). We additionally give the Wilsonian coefficients at leading order in N up to NNLO in the large-charge expansion.
Comment: 30 pages. Matches published version in JHEP
Document Type: Working Paper
Access URL: http://arxiv.org/abs/2311.14793
Accession Number: edsarx.2311.14793
Database: arXiv
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  Data: The unitary Fermi gas at large charge and large N
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  Data: <searchLink fieldCode="AR" term="%22Hellerman%2C+Simeon%22">Hellerman, Simeon</searchLink><br /><searchLink fieldCode="AR" term="%22Krichevskiy%2C+Daniil%22">Krichevskiy, Daniil</searchLink><br /><searchLink fieldCode="AR" term="%22Orlando%2C+Domenico%22">Orlando, Domenico</searchLink><br /><searchLink fieldCode="AR" term="%22Pellizzani%2C+Vito%22">Pellizzani, Vito</searchLink><br /><searchLink fieldCode="AR" term="%22Reffert%2C+Susanne%22">Reffert, Susanne</searchLink><br /><searchLink fieldCode="AR" term="%22Swanson%2C+Ian%22">Swanson, Ian</searchLink>
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  Data: 2023
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  Data: We study the unitary Fermi gas in a harmonic trapping potential starting from a microscopic theory in the limit of large charge and large number of fermion flavors N. In this regime, we present an algorithmic procedure for extracting data from perturbation theory, order-by-order, without the need for other assumptions. We perform a gradient expansion in the interior of the particle cloud, sufficiently far from the cloud edge where the particle density drops rapidly to zero. In this latter region we present the first microscopic computation characterizing the contribution of the edge terms. The microscopic theory reproduces the predictions of the superfluid EFT, including the action, the form of the gap equation, and the energy of the system in a harmonic trap (which maps, via the non-relativistic state-operator correspondence, to the scaling dimension of the lowest operator of charge Q). We additionally give the Wilsonian coefficients at leading order in N up to NNLO in the large-charge expansion.<br />Comment: 30 pages. Matches published version in JHEP
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      – SubjectFull: High Energy Physics - Theory
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      – SubjectFull: Condensed Matter - Quantum Gases
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      – TitleFull: The unitary Fermi gas at large charge and large N
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            NameFull: Hellerman, Simeon
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            NameFull: Krichevskiy, Daniil
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            NameFull: Orlando, Domenico
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