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A Proof of the Conformal Collider Bounds

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arxiv 1603.03771 v2 pith:6I5JH2ZO submitted 2016-03-11 hep-th cond-mat.stat-mechcond-mat.str-elhep-ph

A Proof of the Conformal Collider Bounds

classification hep-th cond-mat.stat-mechcond-mat.str-elhep-ph
keywords fracboundsconformalproofcolliderfieldfirstfurther
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we prove that the "conformal collider bounds" originally proposed by Hofman and Maldacena hold for any unitary parity-preserving conformal field theory (CFT) with a unique stress tensor in spacetime dimensions larger than 2. In particular this implies that the ratio of central charges for a unitary 4d CFT lies in the interval $\frac{31}{18} \geq \frac{a}{c} \geq \frac{1}{3}$. For superconformal theories this is further reduced to $\frac{3}{2} \geq \frac{a}{c} \geq \frac{1}{2}$. The proof relies only on CFT first principles - in particular, bootstrap methods - and thus constitutes the first complete field theory proof of these bounds. We further elaborate on similar bounds for non-conserved currents and relate them to results obtained recently from deep inelastic scattering.

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Cited by 7 Pith papers

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