Very-late-time probing of ER-bridge growth by higher-party multi-entropies

Determine whether multi-entropies involving a general number of parties, without additional probes such as holographic complexity, can detect Einstein–Rosen bridge growth at very late times.

Background

The analysis is restricted to tri-partite entanglement and establishes that genuine tri-partite entropy can continue to grow after ordinary entanglement entropies and mutual informations have saturated. The authors suggest that partitions into more than three parties could probe a broader regime of wormhole growth, but they explicitly leave unresolved whether multi-entropies alone remain capable of tracking the bridge at very late times, where holographic complexity is expected to be effective.

References

It remains unclear, however, whether multi-entropies at general $q$ alone can probe the ER bridge at very late times, as holographic complexity is expected to do.

— Growing Einstein-Rosen Bridge with Multi-partite Entanglement  (2609.18225 - Anegawa et al., 16 Sep 2026) in Section 6, “Discussion”

Whether higher-partite entanglement can in fact access bulk information invisible to bipartite entanglement, in the sense originally motivating this question , therefore remains open within the regime analyzed here; in a companion paper, we explore this question further at finite twist.

— Can Multipartite Entanglement Probe Wormhole Moduli Invisible to Bipartite Entanglement?  (2609.37394 - Iizuka, 29 Sep 2026) in Section VII, Summary and Discussion

Several questions remain. Our analysis is restricted to the symmetric family $L_A=L_{A'}=L_B=L_{B'}=\ell$; moving away from it, or to multiboundary wormholes with more asymptotic regions, may enlarge the region.

— Multipartite Entanglement Can Probe Wormhole Moduli Invisible to Bipartite Entanglement  (2609.37395 - Anegawa et al., 29 Sep 2026) in Section VII, Summary and Discussion