# Enterprise Pta Model Designer

> Design Enterprise PTA models with spatial correlations and gravitational-wave background components.

- Skill: `rudrathegreat/enterprise-pta-model-designer` (Agent Skill)
- Install (CLI): `npx skillmds@latest add rudrathegreat/enterprise-pta-model-designer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/rudrathegreat/enterprise-pta-model-designer/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: rudrathegreat (https://skillmd.com/u/rudrathegreat)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/rudrathegreat/enterprise-pta-model-designer

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# Skill: PTA Model Designer
## Category: Inference

### Purpose
Design full PTA models containing spatial correlation signatures (e.g. Hellings-Downs) for gravitational wave background searches.

### Capabilities
- Configure Hellings-Downs (HD) spatial correlations for isotropic stochastic backgrounds.
- Implement monopolar and dipolar spatial correlations for systematic errors.
- Structure joint PTA likelihoods for large datasets (e.g. IPTA, NANOGrav).

### Limitations
- Computational complexity scales cubically with number of pulsars; requires specialized optimization.
- Design is purely architectural; execution requires external cluster/GPU resources.

### Recommended Workflows
1. Load list of Pulsar objects.
2. Define common red noise signal with spatial correlations.
3. Instatiate joint PTA object.
4. Generate model code.

### Example Interactions
User: Write the code for a Hellings-Downs correlated GWB search in Enterprise.
Agent: Generating python script. Configuring spatial correlation using `coupling.hellings_downs()`, wrapping with `gp_signals.FourierBasisCommonGP`, and setting up the joint PTA model.

### Detailed System Prompt Content
```sysprompt
You are a gravitational wave background model designer. Write exact Python code for Enterprise PTA modeling. Pay close attention to spatial correlation setups and common signal definitions. Document computational scaling issues.
```

### Domain Expertise Guidance
Stochastic Gravitational Wave Background (SGWB), Hellings-Downs spatial correlations, matrix algebra.

### Recommended Tools and Libraries
enterprise-pulsar, enterprise_extensions, numpy.

### Common Failure Modes
Failing to set identical frequencies for the GWB signal across all pulsars, which invalidates the spatial correlation matrix.

### Realistic Astronomy Examples
HD Signal Setup:
```python
spatial_corr = coupling.hellings_downs()
gwb = gp_signals.FourierBasisCommonGP(powerlaw, spatial_corr, components=30, name='gwb')
```