A Special Case Of A Conjecture By Widom With Implications To Fermionic Entanglement Entropy

Details A Special Case Of A Conjecture By Widom With Implications To Fermionic Entanglement Entropy A Special Case Of A Conjecture By Widom With Implications To Fermionic Entanglement Entropy

2009-06-26

arxiv.org/abs/0906.4946v2

Int.Math.Res.Not. 2011:1451-1482,2011

Physics

Mathematical Physics

20 pages, 3 figures, improvement of the presentation, some references added or updated, proof of Theorem 12 (formerly Lemma 11

Scientific paper

10.1093/imrn/rnq085

We prove a special case of a conjecture in asymptotic analysis by Harold Widom. More precisely, we establish the leading and next-to-leading term of a semi-classical expansion of the trace of the square of certain integral operators on the Hilbert space $L^2(\R^d)$. As already observed by Gioev and Klich, this implies that the bi-partite entanglement entropy of the free Fermi gas in its ground state grows at least as fast as the surface area of the spatially bounded part times a logarithmic enhancement.

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