Four-Sector Cosmology: A CPT-Symmetric Resolution of the Hubble Tension, Dark Matter, and Dark Energy

Abstract

    We propose Four-Sector Cosmology (FSC), a theoretical framework in which
the observable universe (Sector I) is one of four CPT-symmetric sectors arising from
a single quantum fluctuation at t = 0. The four sectors are defined by the signs of
spatial coordinates (x) and temporal direction (t):

the observable universe (Sector I) is one of four CPT-symmetric sectors arising from
a single quantum fluctuation at t = 0. The four sectors are defined by the signs of
spatial coordinates (x) and temporal direction (t):

   The initial state satisfies exact CPT symmetry: ΩI,0 = ΩII,0 = ΩIII,0 = ΩIV,0 =
25%. Starting from this single postulate, FSC simultaneously resolves four major
open problems in modern cosmology:
  1. Baryogenesis: Sector IV decay satisfies all three Sakharov conditions, gen-
      erating ηb = 6.1 ×10−10, consistent with BBN observations.
  2. Dark matter: Sector III survives as a stable relic with ΩIII(t0) = 0.268,
      matching Planck 2018.
  3. Dark energy: Sector II accumulates Sector IV decay energy, growing from
      25% to ΩII(t0) = 68.3% — the first derivation of ΩΛ from fundamental sym-
      metry principles without fine-tuning.
   4. Hubble tension: Five-component decomposition yields ∆HFSC0 = 2.69 km/s/Mpc,
       consistent with the observed 2.6 ±0.7 km/s/Mpc discrepancy.

The framework makes five falsifiable predictions testable with DESI DR2, Euclid,
Rubin-LSST, LZ, and gravitational-wave standard sirens within the next five years.