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- W2952657908 abstract "In this paper, we disprove a conjecture of Goemans and Linial; namely, that every negative type metric embeds into $ell_1$ with constant distortion. We show that for an arbitrarily small constant $delta> 0$, for all large enough $n$, there is an $n$-point negative type metric which requires distortion at least $(loglog n)^{1/6-delta}$ to embed into $ell_1.$ Surprisingly, our construction is inspired by the Unique Games Conjecture (UGC) of Khot, establishing a previously unsuspected connection between probabilistically checkable proof systems (PCPs) and the theory of metric embeddings. We first prove that the UGC implies a super-constant hardness result for the (non-uniform) Sparsest Cut problem. Though this hardness result relies on the UGC, we demonstrate, nevertheless, that the corresponding PCP reduction can be used to construct an gap for Sparsest Cut. Towards this, we first construct an integrality gap instance for a natural SDP relaxation of Unique Games. Then we simulate the PCP reduction and translate the integrality gap instance of Unique Games to an integrality gap instance of Sparsest Cut. This enables us to prove a $(log log n)^{1/6-delta}$ integrality gap for Sparsest Cut, which is known to be equivalent to the metric embedding lower bound." @default.
- W2952657908 created "2019-06-27" @default.
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- W2952657908 date "2013-05-20" @default.
- W2952657908 modified "2023-09-27" @default.
- W2952657908 title "The Unique Games Conjecture, Integrality Gap for Cut Problems and Embeddability of Negative Type Metrics into $ell_1$" @default.
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