Visibility is not existence
A photon can drop below useful observation, fall beyond a horizon, or arrive redshifted beyond recognition without simply becoming nothing.
Redshift and horizons
Lost-light cosmology
The lost-light and slow-light research notes sharpen the cosmology wing of DarkMatterDrive: redshift does not merely dim a picture; it forces accounting questions about energy, horizons, distance, lensing, and what tired-light language must survive.
Core question
What happens to light we stop seeing?
The page keeps both sides visible. Conventional expansion cosmology treats redshift and horizons through FLRW geometry and local stress-energy accounting. The ArcSecs frame asks whether lost kinetic light can become a massive, dark substrate.
Energy accounting matters
The conventional model does not use a simple global energy ledger in an expanding universe, so tired-light claims have to state what conservation law they are invoking.
The drive claim is narrower
DarkMatterDrive treats tired light as a speculative fuel substrate, not as a settled replacement for every redshift observation.
Observable pressure tests
How lost light becomes measurable
The research notes add a stronger list of tests that can challenge the slow-light interpretation instead of leaving it as pure narrative.
1Redshift drift
Track whether redshift changes over time in the way expansion predicts.
2Distance duality
Compare luminosity distance, angular size, and surface brightness behavior.
3Time delays
Use lensed transients and fast bursts to test frequency-dependent propagation.
4Lensing residuals
Look for mass-inference mismatches that do not cleanly fit standard halos.
5Photon bounds
Keep photon-mass constraints and dispersion tests in the foreground.
Where this fits
The cosmology wing now has two lenses
Use this page as the counterweight to the more speculative slow-light cosmology page.