# ABC_BRIDGE_INDEX.txt
# STELLAR_BOUNDARY_DYNAMICS_I
# A-B-C Bridge — Tri-Domain Structural Boundary Comparison

BRIDGE:
A-B-C

PARENT DATASET:
stellar_boundary_dynamics

STATUS:
Initialized.

IMPORTANT FOLDER NOTE:
The three v2 vector summaries should be placed in:

ABC_bridge/inputs/

not:

ABC_bridge/summaries/

The summaries/ folder is for outputs created after the ABC bridge comparison.

REQUIRED INPUT FOLDER:
ABC_bridge/inputs/

REQUIRED INPUT FILES:
A_5D_VECTOR_SUMMARY_v2.csv
B_5D_VECTOR_SUMMARY_v2.csv
C_5D_VECTOR_SUMMARY_v2.csv

PURPOSE:
Compare all three normalization-reviewed v2 structural-vector domains together:

A — pre-supernova radial profiles
B — post-collapse light-curve response trajectories
C — post-collapse spectral line-evolution trajectories

This bridge tests whether the stellar boundary-dynamics system behaves as:

1. a transition chain:
   A -> B -> C

2. a branching structure:
   A -> B, with C separating as an independent post-collapse observable regime

3. a linked admissible cluster:
   multiple internally connected regimes related by bridge geometry, not by
   simple identity.

PHASE A:
A_mesa_precollapse_tracks

PHASE A DATA TYPE:
Real pre-supernova radial-profile structures from public precomputed
pre-supernova model profiles.

PHASE A SOURCE:
Zenodo 5556959
Different to the core: the pre-supernova structures of massive single and
binary-stripped stars

PHASE A OBJECTS:
A1_12M
A2_20M

PHASE A REQUIRED INPUT:
A_mesa_precollapse_tracks/alpha_application/normalization_review/A_5D_VECTOR_SUMMARY_v2.csv

PHASE A ROLE:
Pre-boundary radial support/composition structure.

PHASE B:
B_supernova_light_curves

PHASE B DATA TYPE:
Observed post-collapse supernova light-curve response data.

PHASE B SOURCE:
Open Supernova Catalog / AstroCats-derived JSON light-curve data.

PHASE B OBJECTS:
B_SN1987A
B_SN1993J
B_SN1999em
B_SN2011dh
B_SN2012aw
B_SN2013ej

PHASE B REQUIRED INPUT:
B_supernova_light_curves/alpha_application/normalization_review/B_5D_VECTOR_SUMMARY_v2.csv

PHASE B ROLE:
Post-boundary brightness-response relaxation trajectory.

PHASE C:
C_spectral_time_series

PHASE C DATA TYPE:
Observed post-collapse spectral time-series data converted into spectral
line-window structural ladders.

PHASE C SOURCE:
WISeREP public spectra.

PHASE C OBJECTS:
C1_SN1993J
C2_SN2012aw

PHASE C REQUIRED INPUT:
C_spectral_time_series/alpha_application/normalization_review/C_5D_VECTOR_SUMMARY_v2.csv

PHASE C ROLE:
Post-boundary spectral line-evolution / element-redistribution trajectory.

LOCAL INPUT COPIES:
Copy:

A_mesa_precollapse_tracks/alpha_application/normalization_review/A_5D_VECTOR_SUMMARY_v2.csv

to:

ABC_bridge/inputs/A_5D_VECTOR_SUMMARY_v2.csv

Copy:

B_supernova_light_curves/alpha_application/normalization_review/B_5D_VECTOR_SUMMARY_v2.csv

to:

ABC_bridge/inputs/B_5D_VECTOR_SUMMARY_v2.csv

Copy:

C_spectral_time_series/alpha_application/normalization_review/C_5D_VECTOR_SUMMARY_v2.csv

to:

ABC_bridge/inputs/C_5D_VECTOR_SUMMARY_v2.csv

BRIDGE OUTPUT STRUCTURE:
ABC_bridge/
  ABC_BRIDGE_INDEX.txt

  inputs/
    A_5D_VECTOR_SUMMARY_v2.csv
    B_5D_VECTOR_SUMMARY_v2.csv
    C_5D_VECTOR_SUMMARY_v2.csv

  comparisons/
    ABC_DOMAIN_CENTROID_COMPARISON.csv
    ABC_PAIRWISE_DOMAIN_DISTANCE.csv
    ABC_OBJECT_CHAIN_ALIGNMENT.csv
    ABC_TRANSITION_CHAIN_TEST.csv

  summaries/
    ABC_BRIDGE_SUMMARY.csv
    ABC_BRIDGE_INTERPRETATION.txt
    ABC_BRIDGE_RESULT_RECORD.txt

NEXT SCRIPT:
tools/abc_bridge_compare.py

SCRIPT INPUTS:
ABC_bridge/inputs/A_5D_VECTOR_SUMMARY_v2.csv
ABC_bridge/inputs/B_5D_VECTOR_SUMMARY_v2.csv
ABC_bridge/inputs/C_5D_VECTOR_SUMMARY_v2.csv

SCRIPT OUTPUTS:
ABC_bridge/comparisons/ABC_DOMAIN_CENTROID_COMPARISON.csv
ABC_bridge/comparisons/ABC_PAIRWISE_DOMAIN_DISTANCE.csv
ABC_bridge/comparisons/ABC_OBJECT_CHAIN_ALIGNMENT.csv
ABC_bridge/comparisons/ABC_TRANSITION_CHAIN_TEST.csv

ABC_bridge/summaries/ABC_BRIDGE_SUMMARY.csv
ABC_bridge/summaries/ABC_BRIDGE_INTERPRETATION.txt

COMPARISON FEATURES:
mean_GR
var_GR
anisotropic_persistence_bounded
admissibility_persistence
collapse_onset_radius
kappa_connect_reference
tail_dominance_reference

KNOWN PRIOR BRIDGE RESULTS:

A-B bridge:
centroid distance = 0.584026232738
separation label = weak_separation

A-B closest pair:
A2_20M <-> B_SN1993J
distance = 0.232685521403

A-B most separated pair:
A1_12M <-> B_SN2012aw
distance = 2.0846018436

B-C bridge:
centroid distance = 1.31753512889
separation label = strong_separation

B-C object-matched SN1993J:
B_SN1993J <-> C1_SN1993J
distance = 0.712109467708
matched C object is nearest = yes

B-C object-matched SN2012aw:
B_SN2012aw <-> C2_SN2012aw
distance = 1.92329396256
matched C object is nearest = no

PRIMARY ABC QUESTIONS:
1. Does the three-layer system form a transition chain?

   A -> B -> C

2. Or does C branch away from B as an independent post-collapse observable
   regime?

3. Does SN2012aw remain a persistent boundary anomaly across all available
   layers?

4. Does SN1993J remain the best contact object across the full chain?

5. Does the stellar boundary system behave as one trajectory or as a cluster of
   linked admissible regimes?

CHAIN TEST:
The ABC script should compare:

distance(A, B)
distance(B, C)
distance(A, C)

and decide whether the structure looks like:

A -> B -> C chain

or:

A -> B
     -> C branch

or:

A, B, C as three separated but bridge-linked admissible clusters.

OBJECT ALIGNMENT TESTS:
SN1993J:
A2_20M <-> B_SN1993J <-> C1_SN1993J

SN2012aw:
A2_20M or A1_12M <-> B_SN2012aw <-> C2_SN2012aw

The SN1993J chain should test whether the contact/coherence role persists
across all three layers.

The SN2012aw chain should test whether the high-tail/high-kappa anomaly
persists and whether its spectral representation branches away from its
light-curve representation.

VALID CLAIM TARGET:
The ABC bridge can establish whether the stellar boundary-dynamics corpus forms
a multi-layer structural routing pattern across pre-boundary and post-boundary
domains.

INVALID CLAIMS:
Do not claim direct supernova prediction.
Do not claim full hydrodynamic explosion modeling.
Do not claim radiative-transfer modeling.
Do not claim nucleosynthesis yield recovery.
Do not claim that the two Phase A profiles represent all massive-star
progenitors.
Do not claim that the two Phase C pilot objects represent all spectral behavior.

UNNS INTERPRETATION:
The ABC bridge tests whether catastrophic transition preserves admissibility
while routing structure across non-equivalent observable regimes.

Phase A:
pre-boundary support/composition ladder

Phase B:
post-boundary luminosity-response ladder

Phase C:
post-boundary spectral-redistribution ladder

ABC bridge:
tri-domain comparison of boundary routing across admissible structural regimes.

EXPECTED THEORETICAL CONTRIBUTION:
The ABC bridge should help determine whether stellar collapse is better
represented as:

1. one continuous structural trajectory,

2. a transition chain with increasing observational separation,

or

3. an admissible cluster-routing event where the boundary generates multiple
connected but distinct post-boundary regimes.

STATUS:
A v2 vector summary exists.
B v2 vector summary exists.
C v2 vector summary exists.

A-B bridge complete.
B-C bridge complete.

ABC bridge initialized.
Ready for tools/abc_bridge_compare.py after the three v2 summaries are placed
in ABC_bridge/inputs/.
