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The tentative hints for a diphoton resonance at a mass of $\sim 750$ GeV fromthe ATLAS and CMS experiments at the LHC may be interpreted as first contactwith a "dark" sector with a spontaneously broken conformal symmetry. Theimplied TeV scale of the dark sector may be motivated by the interactionstrength required to accommodate a viable thermal relic dark matter (DM)candidate. We model the conformal dynamics using a Randall-Sundrum type 5Dgeometry whose IR boundary is identified with the dynamics of the compositedark sector, while the Standard Model (SM) matter content resides on the UVboundary, corresponding to "elementary" fields. We allow the gauge fields toreside in the 5D bulk, which can be minimally chosen to be $SU(3)_c\timesU(1)_Y$. The "dark" radion is identified as the putative 750 GeV resonance.Heavy vector-like fermions, often invoked to explain the diphoton excess, arenot explicitly present in our model and are not predicted to appear in thespectrum of TeV scale states. Our minimal setup favors scalar DM of$\mathcal{O}(\text{TeV})$ mass. A generic expectation in this scenario,suggested by DM considerations, is the appearance of vector bosons at $\sim$few TeV, corresponding to the gluon and hypercharge Kaluza-Klein (KK) modesthat couple to UV boundary states with strengths that are suppressed uniformlycompared to their SM values. Our analysis suggests that these KK modes could bewithin the reach of the LHC in the coming years.

A 750 GeV Messenger of Dark Conformal Symmetry Breaking