Three Orbits of Steady State: The Price of the Quiet-Galaxy Assumption in the SPARC Λ Bound

Prices the steady-state assumption in Benisty et al. (2405.16650): at the radii driving the Lambda bound a star completes only ~3 orbits (50 kpc) to ~1 (100 kpc) in a galaxy age; imposing a 10-orbit steady-state cut loosens the bound by a factor ~11 via the paper's own inverse-cube scaling.

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-11-02
DOI
https://doi.org/10.5281/zenodo.23926406
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
preprint
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preprint

Three Orbits of Steady State: The Price of the Quiet-Galaxy Assumption in the SPARC Λ Bound

William Alexander Aldred
Zenodo (CERN European Organization for Nuclear Research)
Galaxies: Formation, Evolution, Phenomena
preprint

Three Orbits of Steady State: The Price of the Quiet-Galaxy Assumption in the SPARC Λ Bound

William Alexander Aldred
preprint en

Abstract

Prices the steady-state assumption in Benisty et al. (2405.16650): at the radii driving the Lambda bound a star completes only ~3 orbits (50 kpc) to ~1 (100 kpc) in a galaxy age; imposing a 10-orbit steady-state cut loosens the bound by a factor ~11 via the paper's own inverse-cube scaling.

Zenodo (CERN European Organization for Nuclear Research)
Galaxies: Formation, Evolution, Phenomena
DOIOpen Access PDFOpenAlex
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Three Orbits of Steady State: The Price of the Quiet-Galaxy Assumption in the SPARC Λ Bound — William Alexander Aldred · Zenodo (CERN European Organization for Nuclear Research) (2026) | TGRS Research Map | TGRS