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arXiv · 2401.12294

Nearly critical superfluid: effective field theory and holography

Yanyan Bu·Hongfei Gao·Xin Gao·Zhiwei Li
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Abstract

We study a nearly critical superfluid system from two complementary approaches. Within the first approach, we formulate a Schwinger-Keldysh effective field theory (EFT) for the system when it is located slightly above the critical temperature. . The set of symmetries, particularly the dynamical Kubo-Martin-Schwinger (KMS) symmetry and chemical shift symmetry, strictly constrains the form of EFT action. Within the second approach, using the holographic Schwinger-Keldysh technique, we derive the effective action for a ``microscopic'' holographic superfluid, confirming the EFT construction. A systematic inclusion of non-Gaussianity is one highlight of present study.

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Yanyan Bu, Hongfei Gao, Xin Gao, Zhiwei Li. 2024-01-22. Nearly critical superfluid: effective field theory and holography. https://arxiv.org/abs/2401.12294

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