
R. Kulkarni
=
×
= 36 × 51 = 𝟏𝟖𝟑𝟔.
This is also the dimension of the full coupling matrix : dim() =
1
× (
0
+
2
) = 36 × 51 = 1836 [4].
7.5. Neutron (
= 1839)
Footprint: 3-sheet (same as proton)
Sub-structure:
= 36,
= 51 (same base cost as
proton)
Sector: full + ; but neutral (no global
bounding flux)
Dynamics: static; neutral boundary mimics vacuum
The proton carries electric charge and emits a global topological flux,
which itself satisfies Boundary Closure (Axiom 3) — the bounding cage
closes the gauge boundary without additional probes. The neutron has
no such global flux: its boundary is electrically neutral and is indis-
tinguishable from the surrounding vacuum code state. To distinguish
the neutron from an empty site, the extraction circuit must actively
probe the = 3 internal colour-flux arms of the Y-junction, one per
spatial dimension. This internal probe is mandatory for the neutral case
and absent for the charged case — the asymmetry follows from gauge
structure, not from fitting (see Table 3):
= 36 × 51 + = 1836 + 3 = 𝟏𝟖𝟑𝟗.
8. Comparison with experiment
Proton–neutron mass difference. The model gives
−
= 3
; the
measured value is 2.531
, an 18.5% discrepancy on the splitting. This
gap is expected: discrete topological costs set the integer baseline, while
electromagnetic self-energy and bare quark masses produce sub-integer
QFT corrections that lie outside the framework.
9. Extension to the broader standard model
9.1. Scope of the first-shell enumeration
The 25 candidates in Table 2 span all defect geometries within the
first coordination shell of the FCC lattice ( = 12 nearest neighbours).
This shell accommodates the five lightest non-strange particles. Par-
ticles requiring a second-shell description, a condensate description,
or a sub-threshold (near-vacuum) description lie outside the present
enumeration.
9.2. Gauge bosons
The = 12 FCC bonds partition exactly as =
TOR
+
TR
= 8+4 =
12, where
TOR
= 8 triangular-plaquette bonds host the SU(3) sector (8
gluons) and
TR
= 4 square-plaquette bonds host the electroweak sector
(
+
,
−
, , ). This partition exactly reproduces the Standard Model
gauge boson count at the structural level. The gauge boson masses
involve the Higgs mechanism and lie outside the topological defect
classification of the present framework.
9.3. Neutrinos
All five first-shell stable states have verification cost
≥ 1. The
electron (
= 1) is the minimum stable defect. Neutrino masses,
suppressed by seven orders of magnitude below the electron, would
correspond to
1 — strictly below the first topological threshold
of the M/E/I framework. Within the M/E/I picture this is consistent: the
sieve finds no stable first-shell defect with 0 <
< 1, which is why
neutrinos do not appear in Table 2 as massive topological defects. A
derivation of neutrino masses and PMNS mixing angles within the FCC
vacuum framework requires an extended sub-threshold analysis beyond
the scope of the present work.
9.4. Heavier leptons and strange hadrons
The tauon, kaons, lambda baryons, and sigma baryons are not
matched by any first-shell configuration. This is a scope boundary of the
present framework: the five surviving states account for the five lightest
non-strange particles; no first-shell defect geometry corresponds to
these heavier particles.
9.5. Higgs boson
The Higgs boson is the vacuum condensate mode of the FCC lat-
tice, not a topological defect. Its mass scale (125 GeV) far exceeds
the first-shell defect energies, placing it outside the topological defect
classification of the present framework.
9.6. Excluded configurations and BSM physics
All 20 rejected configurations in Table 2 are eliminated by inter-
nal topological inconsistency — dimensional mismatch, open gauge
boundary, or kinematic contradiction — not by the physical absence
of a corresponding particle. The framework predicts no stable non-
SM particle within the first coordination shell, consistent with all LHC
exclusion limits [14].
10. Conclusions
Discarding the continuous geometric vacuum in favour of a discrete
topological CSS code allows a bottom-up identification of five consis-
tent defect states whose verification costs exactly match fundamental
particle masses. The mass ratio
∕
=
∕
is a pure topological
invariant: , , and cancel exactly, leaving integer predictions from
the FCC -vectors alone. Applying strict axioms grounded in QEC
theory and lattice gauge theory filters 25 candidate geometries down
to exactly 5 physically viable states. Their precise alignment with the
empirical Standard Model mass spectrum provides robust, falsifiable
evidence that inertial mass is the thermodynamic shadow of quantum
error correction overhead.
CRediT authorship contribution statement
Raghu Kulkarni: Writing – review & editing, Writing – original
draft, Visualization, Validation, Methodology, Conceptualization.
Declaration of competing interest
The authors declare that they have no known competing finan-
cial interests or personal relationships that could have appeared to
influence the work reported in this paper.
Data availability
Data will be made available on request.
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