PROVENANCE RECORD
Cosmological Boundary Routing
Dataset C — Planck-Anchored Lambda-CDM
UNNS Substrate Research Program

1. DATASET IDENTITY

Dataset label:
C_planck_lcdm

Dataset role:
Observationally anchored post-boundary expansion regime for the Cosmological Boundary Routing project.

Purpose:
To provide the canonical Lambda-CDM parameter anchor used to generate the Dataset C expansion trajectory and to compare that trajectory with:

A_classical_friedmann
B_lqc_bounce

Dataset C is not raw sky-map data. It is a parameter-based cosmological reference derived from the official Planck 2018 cosmological-parameter products.

2. PRIMARY SOURCE

Institution:
European Space Agency

Mission:
Planck

Archive:
Planck Legacy Archive
https://pla.esac.esa.int/#cosmology
Product class:
Cosmology Products

Release:
PR3 — 2018

Archive access date:
2026-06-08

Primary archive entry:
Planck Legacy Archive / Cosmology / Cosmological Parameters

3. SOURCE PACKAGES

The following official Planck archive packages were downloaded and retained in:

C_planck_lcdm/source_planck_2018/

Package 1:
COM_CosmoParams-base-plikHM-TTTEEE-lowl-lowE_R3.00.zip

Extracted directory:
COM_CosmoParams-base-plikHM-TTTEEE-lowl-lowE_R3.00/

Description:
Baseline Lambda-CDM chains and associated GetDist outputs using the Planck high-multipole TT, TE, and EE likelihood together with low-multipole temperature and lowE polarization likelihoods.

Canonical likelihood label:
plikHM_TTTEEE_lowl_lowE

Release tag:
R3.00

Downloaded archive size:
Approximately 63.8 MB


Package 2:
COM_CosmoParams_parameter-tables_R3.01.zip

Extracted directory:
COM_CosmoParams_parameter-tables_R3.01/

Description:
Official Planck 2018 cosmological-parameter tables, including the baseline 68 percent confidence parameter table and supporting documentation.

Release tag:
R3.01

Downloaded archive size:
Approximately 128.3 MB

4. CANONICAL MODEL SELECTION

The canonical parameter combination selected for the first Dataset C trajectory is:

base_plikHM_TTTEEE_lowl_lowE

This corresponds to the baseline flat six-parameter Lambda-CDM model constrained by:

- Planck high-multipole TT
- Planck high-multipole TE
- Planck high-multipole EE
- low-multipole temperature
- lowE polarization

The following variants are not used in the first canonical trajectory:

- lensing-augmented combinations
- BAO-augmented combinations
- z_re > 6.5 prior variants
- PR4 map-only products
- extended cosmological models

These may be introduced later as robustness or sensitivity tests.

5. RETAINED PARAMETER FILES

The following files were copied into:

C_planck_lcdm/parameters/

base_plikHM_TTTEEE_lowl_lowE.minimum
Purpose:
Best-fit parameter point used as the primary canonical parameter set for deterministic trajectory generation.

base_plikHM_TTTEEE_lowl_lowE.paramnames
Purpose:
Maps parameter identifiers to human-readable labels and derived parameter names.

base_plikHM_TTTEEE_lowl_lowE.inputparams
Purpose:
Records the model, likelihood, priors, and chain configuration used in the original Planck analysis.

base_plikHM_TTTEEE_lowl_lowE.margestats
Purpose:
Contains marginalized posterior means and confidence intervals.

base_plikHM_TTTEEE_lowl_lowE.covmat
Purpose:
Contains the parameter covariance matrix for later uncertainty propagation and Monte Carlo sampling.

base_plikHM_TTTEEE_lowl_lowE.likestats
Purpose:
Contains likelihood summary statistics and fit diagnostics.

base_plikHM_TTTEEE_lowl_lowE.converge
Purpose:
Contains chain convergence diagnostics.

Parameter table readme.txt
Purpose:
Official documentation for the Planck parameter-table package.

baseline_params_table_2018_68pc.pdf
Purpose:
Human-readable official Planck 2018 baseline parameter table at 68 percent confidence.

6. SOURCE-TO-DERIVED WORKFLOW

The official Planck files are preserved unchanged in:

C_planck_lcdm/source_planck_2018/

The selected parameter and diagnostic files are copied into:

C_planck_lcdm/parameters/

Derived files generated later from these sources must be stored separately in:

C_planck_lcdm/generated_trajectory/
C_planck_lcdm/canonical/

No generated trajectory, normalized ladder, alpha-applied output, or UNNS structural vector should overwrite or modify the official source files.

7. PARAMETERS TO BE EXTRACTED

The first canonical parameter record should include, where available:

H0
omegabh2
omegach2
Omega_m
Omega_Lambda
Omega_r
n_s
ln(10^10 A_s)
A_s
tau
sigma8
age

Derived quantities must be clearly marked as derived rather than directly quoted from the archive files.

Omega_Lambda may be derived under flatness from:

Omega_Lambda = 1 - Omega_m - Omega_r

Omega_r may be computed from the adopted photon temperature and relativistic-species convention if it is not directly provided in the selected Planck summary file.

8. USE IN COSMOLOGICAL BOUNDARY ROUTING

Dataset C provides the observationally compatible expansion regime.

It will be used to generate:

- scale factor a(t)
- Hubble parameter H(t)
- matter density rho_m(t)
- radiation density rho_r(t), where included
- dark-energy density rho_Lambda
- total density rho(t)
- curvature or curvature-proxy variables
- normalized UNNS boundary-margin candidates
- canonical ordered ladder
- alpha-applied structural representation
- STRUC-PERC-I input
- bridge-comparable structural vector

Dataset C will then be compared with:

A:
Classical Friedmann trajectory approaching the singular boundary.

B:
Effective loop quantum cosmology bounce trajectory with a positive minimum scale factor.

9. INTERPRETIVE STATUS

The Planck parameter products constrain the standard cosmological model over the observable expansion history.

They do not directly observe:

- the classical singularity
- a quantum bounce
- a pre-Big-Bang phase
- the proposed UNNS admissibility boundary

Their role in this project is to anchor the post-boundary expansion regime to an official observational cosmology product.

The classical and LQC-style trajectories remain model-generated datasets and must not be described as direct Planck observations.

10. REPRODUCIBILITY REQUIREMENTS

Any script that reads these products must record:

- exact source filename
- exact parameter field name
- selected value
- whether the value is best-fit, posterior mean, or derived
- uncertainty, where used
- units
- transformation formula
- software version
- output filename

The first canonical Dataset C trajectory must use one frozen parameter record. Uncertainty propagation should be performed only after the deterministic baseline has been validated.

11. CURRENT STATUS

Official Planck source archives:
Downloaded

Official archives extracted:
Yes

Canonical non-lensing baseline selected:
Yes

Selected parameter and diagnostic files copied:
Yes

Canonical compact parameter record extracted:
Not yet

Dataset C expansion trajectory generated:
Not yet

Alpha application completed:
Not yet

STRUC-PERC-I evaluation completed:
Not yet

ABC bridge completed:
Not yet

12. NEXT STEP

Create a compact machine-readable and human-readable parameter record from:

base_plikHM_TTTEEE_lowl_lowE.minimum
base_plikHM_TTTEEE_lowl_lowE.margestats
base_plikHM_TTTEEE_lowl_lowE.paramnames

Recommended outputs:

planck_2018_base_plikHM_TTTEEE_lowl_lowE_parameters.csv
planck_2018_base_plikHM_TTTEEE_lowl_lowE_parameters.txt

These records should become the sole parameter input for the first generated Dataset C trajectory.
