Transcription of Parallel Universes
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To appearinScience andUltimateReality:FromQuantumto Cosmos, honoringJohnWheeler's90thbirthday, , ,& eds.,CambridgeUniversity Press(2003) Physics, Pennsylvania,Philadelphia,PA surveyphysicstheoriesinvolvingparallelun iverses,which forma naturalfour-levelhierarchy of multiversesallowingprogressivelygreaterd iversity. Level I: A genericpredictionofin ationis an in niteergodicuniverse,which containsHubblevolumesrealizingall initialconditions|includinganidenticalco py of youabout101029m away. Level II: Inchaoticin ation,otherthermalizedregionsmay have di erent physicalconstants, dimensionality andparticlecontent.
Jan 23, 2003 · scales. The Sloan Digital Sky Survey has found M=M as small as 1% on the scale R ˘ 1025m and cosmic mi-crowavebackgroundmeasurements have established that the trend towardsuniformity continues all the way out to the edge of our observable universe (R ˘ 1027m), where M=M ˘ 10 5. Barring conspiracy theories where the
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