# Early validation of hidden galactic dynamics

Checkpoint **discovery-2026-10-01.7** closes the bounded scientific screens. It
establishes results in prescribed fields, not different live galactic bars.
The [terminal-science synthesis](SYNTHESIS.md), [conceptual learning note](research/discovery-20261001/LEARNINGS.md)
and [scientific compute accounting](RESOURCE_SUMMARY.md) explain what each model
adds and what remains untested. No new screen validates observations or CDM/SIDM.

## Hidden populations and an imposed bar

Positive halo twins can match continuum density, all local mean velocities and
all raw velocity moments of even total degree while responding differently to
one imposed rotating perturbation. The [new weak-history test](TWINS_WEAK.md)
resolves six positive transfer contrasts and supports three paired quadratic
amplitude comparisons. **All six five-percent magnitude forecasts remain
unresolved**, including the retained p4 tail limitation. Interval agreement is
not magnitude validation. The full-halo fixed-mass test is separate from the
older stronger forcing and the original paper's fixed-fast-action slice.

## Which stars bear the energy cost?

The [completed same-sample stellar refinement](WARM_COST.md) passes its frozen
necessary scalar-energy gates. The fixed inner guiding cohort has 2.65% of the
stellar mass but carries 95.6%/99.9% of the paired energy at carriers 5/8. Its
specific-energy deposit is much larger than the whole-population average.
Energy is not measured random velocity dispersion. No co-spatial halo/star
ratio, disk-survival bound or self-consistent core follows. Original failures,
the cost-stopped extension and reader01 failure remain unchanged.

## Orbital memory and its gravitational readout

The controlled radial echo has a tiny force. The finite spatial calculation
still fails its registered coarse/fine gate despite resembling a leading
approximation. [The .6 diagnosis](CHECKS_V2.md) retains those failures; no late
finite spatial echo, collective amplification or visible disk structure is
validated. Collision-law and modified-inertia results remain bounded screens,
not new dark-matter or gravity laws.

The [interactive report](https://djova.ca/galaxy-bar/discovery.html) and
[recorded control explorer](https://djova.ca/galaxy-bar/discovery-controls.html)
require the website. This mirror provides static figures, complete small values,
methods and saved-arithmetic readers. [Reproduction instructions](README.md)
separate inspection, verification and optional numerical execution. Reading
never runs a job; saved-summary agreement is not orbit reproduction or proof
of error-proxy coverage. Automated website access remains client-dependent.
The package is AI-assisted and not externally reviewed. Original numerical
records and earlier release tags remain available unchanged.