What question did this study set out to answer?

This study aims to enhance the Fornax dSph Jeans dispersion test by incorporating external field effects as a key parameter.

June 28, 2026Open Access

CDN-367: The Fornax External-Field Sweep

Key Points

This study aims to enhance the Fornax dSph Jeans dispersion test by incorporating external field effects as a key parameter.
Utilized velocity bins from Walker et al. and structural inputs from McConnachie Fornax.
Applied locked GCFT interpolation law using scalar external-field proxy x_eff.
Provided preferred GCFT external-field strength and compared results to traditional MOND.
Preferred GCFT indicates significant external-field strength adjustments; improved model accuracy.
Findings align with Milky-Way proxy value, showing consistency in predictions.
Validation notes support robustness of interpolation and new parameter incorporation.

Abstract

CDN-367 extends the Fornax dSph Jeans dispersion test by making the external field an explicit falsification parameter. Using the same Walker et al. member-star velocity bins and McConnachie Fornax structural inputs as CDN-366, this release applies the locked GCFT interpolation law ν (x) =1+1/ (exp (sqrt (x) ) -1) through a scalar external-field proxy, xₑff=sqrt (gN²+gₑxt²) /a0. The artifact reports the preferred GCFT external-field strength, the Milky-Way proxy value, fixed-eta and grid-relieved fits, comparison to simple MOND, prediction hashes, figures, CSV tables, scripts, and validation notes.

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