One cut, two parities: exact Fibonacci charge responses in the golden chain
Abstract
We determine the exact cut-charge Born law in the ground state of every periodic antiferromagnetic golden chain with at least three sites. Its two parity branches retain different information. At even length, the ratio of nontrivial to vacuum probabilities equals the squared Fibonacci quantum dimension. The odd vacuum probability equals the even-branch nontrivial probability times one ground-state Born coordinate, while normalization fixes the complement. Parity selects the positive hoop sector at even length and the complementary sector at odd length. At each length, the corresponding cut projector compresses to a scalar in the even sector or to a non-scalar element of a two-character algebra in the odd sector. The unchanged measurement rule yields categorical rigidity at even length and one-coordinate state sensitivity at odd length.
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BibTeX
@misc{liang2026parities,
title = {{One cut, two parities: exact Fibonacci charge responses in the golden chain}},
author = {Yi Liang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.01151},
eprint = {2607.01151},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.01151},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - One cut, two parities: exact Fibonacci charge responses in the golden chain
AU - Yi Liang
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2607.01151
UR - https://arxiv.org/abs/2607.01151
AB - We determine the exact cut-charge Born law in the ground state of every periodic antiferromagnetic golden chain with at least three sites. Its two parity branches retain different information. At even length, the ratio of nontrivial to vacuum probabilities equals the squared Fibonacci quantum dimension. The odd vacuum probability equals the even-branch nontrivial probability times one ground-state Born coordinate, while normalization fixes the complement. Parity selects the positive hoop sector at even length and the complementary sector at odd length. At each length, the corresponding cut projector compresses to a scalar in the even sector or to a non-scalar element of a two-character algebra in the odd sector. The unchanged measurement rule yields categorical rigidity at even length and one-coordinate state sensitivity at odd length.
ER -