• DOI:10.1086/305673
• Corpus ID: 2261614

Why is the CMB fluctuation level 10^{-5}?

@inproceedings{Tegmark1997WhyIT,
  title={Why is the CMB fluctuation level 10^\{-5\}?},
  author={Max Tegmark and Martin J. Rees},
  year={1997}
}

• M. Tegmark, M. Rees
• Published 8 September 1997
• Physics

W eexplorethequalitativechangesthatwould occuriftheam plitude Q (cid:24) 10 (cid:0) 5 ofcosm ologicaldensity (cid:13)uctuations were di(cid:11)erent. If Q (cid:24) < 10 (cid:0) 6 ,the cosm ologicalobjects that form would have so low virial tem peraturesthatthey m ay beunableto cooland form stars,and would beso loosely bound thateven if they could produce a supernova explosion,they m ightbe unable to retain the heavy elem entsnecessary forplanetary life. If Q (cid:24) > 10 (cid:0) 4 ,dense superm assive galaxieswould form ,and biologicalevolution could bem arred by shortdisruption tim escalesforplanetary orbits.If Q werestilllarger,m ostbound system s would collapse directly to superm assive black holes. These constraintson Q can be expressed in term s of fundam entalconstants alone, and depend only on the electrom agnetic and gravitationalcoupling constants,the electron-proton m ass ratio and the m atter-to-photon