CPT Mirror Underverse Prior

Status: EXTERNAL_REFERENCE_PRIOR

Claim boundary: this is a bounded external physics prior for Underverse accounting. It does not prove a mirror universe, does not prove dark matter or dark energy, does not promote a cosmology fit, and does not change the Lean Underverse packet semantics. It only gives a useful symmetry-accounting pattern: a globally conserved symmetry may appear locally broken when only one sector is visible.

User seed:

https://www.popularmechanics.com/space/deep-space/a71234773/mirror-universe-cpt/

Primary source for the seed article:

M. M. Chaichian, M. Gogberashvili, M. N. Mnatsakanova, T. Tsiskaridze,
CPT Violation, Mirror World and Implications for Baryon Asymmetry,
European Physical Journal C 86, 425 (2026)
arXiv:2603.22381
DOI: 10.1140/epjc/s10052-026-15592-5

Precedent source:

Latham Boyle, Kieran Finn, Neil Turok,
CPT-Symmetric Universe,
Physical Review Letters 121, 251301 (2018)
arXiv:1803.08928
DOI: 10.1103/PhysRevLett.121.251301

Physics Kernel

The 2026 paper proposes a paired-universe model:

visible sector
  + coordinate-reversed mirror sector
  -> globally CPT-symmetric system
  -> local CPT violation allowed inside each sector
  -> possible inflaton / anti-inflaton mass difference
  -> altered reheating temperatures
  -> baryon asymmetry in both sectors

The useful Research Stack reading is not "the mirror universe is true." The useful reading is:

local ledger imbalance may be the visible half of a larger symmetry account

That is Underverse-shaped.

Minimal Equation Pack

CPT transform as a discrete account inversion:

C: charge conjugation        q -> -q
P: parity / spatial mirror   x -> -x
T: time reversal             t -> -t

CPT: (q, x, t) -> (-q, -x, -t)

Paired-sector bookkeeping:

U_total = U_visible + U_mirror

CPT_global(U_total) = U_total

CPT_local(U_visible) may fail while CPT_global still closes

Baryon-asymmetry observable:

B_U = (n_b - n_bar_b) / s ~ 10^-10

Inflaton-field sketch from the 2026 paper:

ddot(phi) + 2 (dot(a)/a) dot(phi)
  + (a^2 m^2 + ddot(a)/a) phi = 0

With:

phi(t)  ~ t^(-3/2) exp(+i m t / c)
phi'(t) ~ t^(-3/2) exp(-i m t / c)

The mirror-sector field is treated as the coordinate-reversed companion needed to keep the larger symmetry account coherent.

Mapping To Underverse

CPT/mirror concept	Underverse analogue
visible universe	promoted / positive equation surface
mirror universe	hidden complement / Underverse ledger
local CPT violation	local route appears imbalanced
global CPT conservation	full ledger closes across visible + hidden sectors
opposite chirality	route orientation/reflection bit
reversed microscopic time	inverse receipt direction / rollback lane
inflaton/anti-inflaton mass split	asymmetric cost or scalar-load split
baryon asymmetry	small visible residue after cancellation

New Underverse variant:

U_CPT_MIRROR
terminal: HOLD_CPT_MIRROR_ACCOUNTING
meaning: global symmetry may require a hidden mirror/complement ledger before
         local imbalance can be interpreted
promotion rule: hold until both visible and mirror-side accounting functions,
                transforms, and receipts are declared

Stack Rule

If a local equation appears to violate a conservation, symmetry, orientation, or
time-accounting law, do not immediately promote the violation as a discovery.
First ask whether the missing term belongs in the Underverse as a typed mirror
ledger.

This gives a cleaner split:

positive equation surface:
  what was admitted and replayed

Underverse mirror ledger:
  what was excluded, reversed, unpaid, hidden, or required for global closure

HOLD Boundaries

These remain HOLD:

mirror universe as established fact
dark matter or dark energy explanation
baryogenesis proof
inflation model promotion
Research Stack cosmology fit
Lean theorem promotion
compression/Hutter claim
hardware/FPGA/ASIC claim

Allowed use:

external CPT/mirror-world prior
Underverse complement-accounting analogy
chirality and time-reversal route warning
global-vs-local symmetry receipt pattern

Next Local Fixture

A small local fixture can model this without cosmology:

given a transition T with visible residual R_v:
  construct mirror candidate M(T)
  compute mirrored residual R_m
  check closure: R_v + R_m <= epsilon
  if missing mirror receipt: HOLD_CPT_MIRROR_ACCOUNTING

This is a receipt diagnostic, not a physics simulation.

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