I understand the inflation predicts a nearly scale invariant power spectrum but some have claimed this was predicted before inflation (by Harrison and Zeldovitch?)(adsbygoogle = window.adsbygoogle || []).push({});

My understanding is that perfectly scale invariance would predict ns=1 but inflation predicts ns =.96. So did the prior prediction ( if this claim is true) predict ns=1 or ns=.96 ?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# I Scale invariance in the power spectrum

Have something to add?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**