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arXiv · 2604.07463

Decoding multiway gravitational junctions in AdS in terms of holographic quantum maps

Avik Chakraborty·Tanay Kibe·Martín Molina·Ayan Mukhopadhyay·Giuseppe Policastro
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Abstract

It has been shown that multiway junctions gluing $n$ copies of locally AdS$_3$ spacetimes ($n\geq 2$) can be described by $n-1$ strings obeying non-linear Nambu-Goto equations coupled by Monge-Amp\`{e}re like terms. Here we study how such junctions along with their stringy degrees of freedom can be interpreted in terms of an interface between $n$ identical holographic conformal theories each defined on a semi-infinite line (wire). We study the gravitational scattering problem at the multiway junction, and show that at the linearized order the dual interfaces correspond to quantum maps which factorize into a product of a scattering matrix determined only by the tension of the dual junction and relative automorphisms of the Virasoro algebra governed by the $n-1$ stringy modes. Both of these are universal in the sense that they are independent of linear modifications of the background state. These generalize earlier results for the 2-way junctions implying that the dual interface is a tunable energy transmitter. We comment on understanding the quantum map corresponding to the full non-linear gravitational problem, and study Ward identities and unitarity bounds.

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Avik Chakraborty, Tanay Kibe, Martín Molina, Ayan Mukhopadhyay, Giuseppe Policastro. 2026-04-08. Decoding multiway gravitational junctions in AdS in terms of holographic quantum maps. https://arxiv.org/abs/2604.07463

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