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Most of this answer is based on First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications For Inflation. As I am not an expert in this area, I am more transcribing the computation rather than interpreting it. The tensor/scalar ratio is given by: $$r \equiv \frac{\Delta^{2}_{h}(k_{0})}{\Delta^{2}_{\mathcal{R}}(k_{0})}$$ Where the ...

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