Many-body theory of false vacuum decay in quantum spin chains

• URL: http://arxiv.org/abs/2508.13780v1
• Date: Tue, 19 Aug 2025 12:29:11 GMT
• Title: Many-body theory of false vacuum decay in quantum spin chains
• Authors: Christian Johansen, Alessio Recati, Iacopo Carusotto, Alberto Biella,
• Abstract summary: We develop a many-body theory describing the nucleation and the coherent dynamics of true-vacuum bubbles.<n>This bosonic theory allows us to identify different regimes in the parameter space and unravel the underlying physical mechanisms.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this work we theoretically investigate the false vacuum decay process in a ferromagnetic quantum spin-1/2 chain. We develop a many-body theory describing the nucleation and the coherent dynamics of true-vacuum bubbles that is analytically tractable and agrees with numerical matrix product state calculations in all parameter regimes up to intermediate times. This bosonic theory allows us to identify different regimes in the parameter space and unravel the underlying physical mechanisms. In particular, regimes that closely correspond to the cosmological false vacuum decay picture are highlighted and characterized in terms of observable quantities.

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