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arXiv 1502.00228hep-thcond-mat.str-el
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Newton-Cartan背景下的场论与Lifshitz真空的对称性

Field Theory on Newton-Cartan Backgrounds and Symmetries of the Lifshitz Vacuum

Jelle Hartong, Elias Kiritsis, Niels A. Obers

摘要:

Lifshitz时空的全息对应于固定扭转Newton-Cartan(TNC)背景上的对偶场论。我们研究了非相对论场论与TNC背景的耦合,并揭示了一种新的机制,通过这种机制,全局U(1)可以成为局部的。这涉及到TNC矢量$M_μ$,它产生粒子数电流,并且对于平坦的NC时空,它满足$M_μ=\partial_μM$,并在$M$上实现薛定谔对称。我们讨论了各种玩具模型场论平坦NC时空的新机制导致额外的全球时空对称性超出了一般的Lifshitz对称性,允许增强薛定谔对称性。在全息方面,源$M$也出现在Lifshitz真空中,具有与平坦NC时空完全相同的性质。特别地,保持边界条件的体元同态实现了$M$上的薛定谔代数,允许守恒的粒子数流。最后,我们提出了一个复杂的标量场的探测行动的Lifshitz真空,表现出薛定谔不变性的场论模型中看到的相同的方式。

英文摘要:

Holography for Lifshitz space-times corresponds to dual field theories on a fixed torsional Newton-Cartan (TNC) background. We examine the coupling of non-relativistic field theories to TNC backgrounds and uncover a novel mechanism by which a global U(1) can become local. This involves the TNC vector $M_μ$ which sources a particle number current, and which for flat NC space-time satisfies $M_μ=\partial_μM$ with a Schroedinger symmetry realized on $M$. We discuss various toy model field theories on flat NC space-time for which the new mechanism leads to extra global space-time symmetries beyond the generic Lifshitz symmetry, allowing for an enhancement to Schroedinger symmetry. On the holographic side, the source $M$ also appears in the Lifshitz vacuum with exactly the same properties as for flat NC space-time. In particular, the bulk diffeomorphisms that preserve the boundary conditions realize a Schroedinger algebra on $M$, allowing for a conserved particle number current. Finally, we present a probe action for a complex scalar field on the Lifshitz vacuum, which exhibits Schroedinger invariance in the same manner as seen in the field theory models.

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