# 📐  L2 Digital Twin — Expansion-History Inference Twin

**ID:** `L2-913` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-913`](/artifact/l1/L1-913)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.9 · **Delta tier:** 50

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H0 | — | 65 – 75 |
| Model | — | ΛCDM|w0wa|quintessence |
| Omega m | m | 0.25 – 0.35 |

## 2. Tolerance (ε)

**Type:** `fn`

```
RMS w(z) error ≤ 0.08; H0 recovered within 1 km/s/Mpc
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.9 |
| Delta tier | 50 |

## 4. Fingerprint

`99e295e53f710bf303c520447767037875e074d1f569549130349e1379bf9d09`

---

## File Mapping

This bundle consists of: `L2-913.md`, `L2-913.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-913.md` | Source of truth — edit this | Human or LLM |
| `L2-913.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-913`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._