The Law the Data Did Not Pick: Viscosity Proportional to H, Tested Against Its Own Family

Hu & Hu (2401.13005) assume bulk viscosity proportional to H. Integrating the family zeta ~ H^p (p=0,1,2) at identical present-day viscous pressure, the H(z) curves differ by at most 1.13% out to z=2, below the 5-15% chronometer errors in the fit: the data reward the family, not the assumed law, while the paper's floor and statefinder results are specific to p=1.

Authors

Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-11-02
DOI
https://doi.org/10.5281/zenodo.23926397
Primary Topic
Cosmology and Gravitation Theories
Type
preprint
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preprint

The Law the Data Did Not Pick: Viscosity Proportional to H, Tested Against Its Own Family

William Alexander Aldred
Zenodo (CERN European Organization for Nuclear Research)
Cosmology and Gravitation Theories
preprint

The Law the Data Did Not Pick: Viscosity Proportional to H, Tested Against Its Own Family

William Alexander Aldred
preprint en

Abstract

Hu & Hu (2401.13005) assume bulk viscosity proportional to H. Integrating the family zeta ~ H^p (p=0,1,2) at identical present-day viscous pressure, the H(z) curves differ by at most 1.13% out to z=2, below the 5-15% chronometer errors in the fit: the data reward the family, not the assumed law, while the paper's floor and statefinder results are specific to p=1.

Zenodo (CERN European Organization for Nuclear Research)
Cosmology and Gravitation Theories
DOIOpen Access PDFOpenAlex
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The Law the Data Did Not Pick: Viscosity Proportional to H, Tested Against Its Own Family — William Alexander Aldred · Zenodo (CERN European Organization for Nuclear Research) (2026) | TGRS Research Map | TGRS