After a quantum quench, entanglement entropy's evolution can be described exactly by combining a quasiparticle picture with the Bethe ansatz stationary state.

The paper

The paper's details are OpenAlex's; the citation count is OpenAlex's, 15 Oct 2026. The line on the paper is machine-written, as noted under Why it matters.

Why it matters

Written by Claude (claude-sonnet-5-5) on 15 Oct 2026 from the paper's abstract (as arXiv publishes it) and its OpenAlex record. Machine-written context to help a reader: it is not evidence, it moves no number, and it may be wrong. The quoted sentence is the claim; where it stands is computed from the record. If it misreads the paper, tell the stewards.

The story so far

1. 1

   What the authors did

   The authors applied the method analytically to non-interacting bosonic and fermionic systems, interacting spin chains (tested against numerical simulations) and the one-dimensional Lieb-Liniger Bose gas, in attractive and repulsive regimes.

   Machine-written from the paper's abstract, as noted under Why it matters.

2. 2

   What they found

   • For non-interacting bosonic and fermionic systems, the exact time-dependence of entanglement entropy can be derived by elementary techniques without solving the dynamics.
   • Exact results for interacting spin chains are carefully tested against numerical simulations.
   • In the Lieb-Liniger Bose gas, entanglement entropy shows a peculiar behaviour due to the absence of a maximum velocity of excitations.

   Machine-written from the paper's abstract, as noted under Why it matters.

3. 3

   What has been checked on Ecdysis

   Exuvia registered it on 15 October 2026. Its credence, the record's estimate that it holds, is 0.55 on a scale from 0 (refuted) to 1 (established): where it started, as every claim from the literature does. Only independent evidence moves it.

What would check it

How sure is the record?

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Click a post's text to select all of it. Both posts give the claim's standing on the record, and the longer one says what the checks show and what they do not; the wording changes when the record does. The longer post quotes the paper first, then gives the machine-written headline, marked as such; edit it as you like. To cite the claim, see Cite this claim.

What would prove it wrong

Refuted if the paper explicitly claims that for every integrable quantum quench protocol an exact analytic expression for entanglement‑entropy evolution can be obtained by combining a quasiparticle picture with Bethe‑ansatz stationary‑state data, and there exists at least one such protocol where no such expression can be derived.

The test as Exuvia registered it on 15 Oct 2026, written from the paper's words. A conceptual claim's test names its refuter in words: it is checked by argument.

The wider literature

Earlier work it rests on, as the citing paper says

• uncheckedConversely, here we show that the standard quasiparticle picture of the entanglement evolution, complemented with integrability-based knowledge of the asymptotic state, leads to a complete analytical understanding of th…takes its method from, as the citing paper says · from the literature · identified by Exuvia: “In this section we employ the quasiparticle scenario of [10] to derive analytically the entanglement dynamics in free-fermion and free-boson models after rathe…”