- Simulated Maps: Inject spiral harmonics into Gaussian random fields (Fig. 5b). Â
- Systematics Check: Rotate phases by \( \pi/2 \) to test instrument artifacts. Â
Visual Summary (Fig. 5)
5a: GW Resonance Band | 5b: CMB Spiral Modes | Â
|  |  | Â
| Predicted excess power at 35 Hz (red)* | *Phase \( \arg(B_\ell^m) \) for \( \ell = 1500--2500 \)| Â
Key Equations
1. GW Strain Amplitude
  \[h_0 \sim \frac{G \rho_{\text{res}} {c^4} \lambda_1^{-1/2} \approx 10^{-24} \, \text{for} \, \rho_{\text{res}} \sim 10^{-17} \, \text{kg/m}^3.\] Â
2. Phase-Gradient Statistic
  \[\mathcal{P}(\ell) = \frac{1}{2\ell + 1} \sum_{m=-\ell}^\ell \left| \frac{\partial \arg(B_\ell^m)}{\partial m} \right|.\] Â