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Parallel Universes - Massachusetts Institute of Technology

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. LevelIII: In unitaryquantummechanics,otherbranchesof thewavefunctionaddnothingqualitativelyne w,which is ironicgiventhatthislevel IV:Othermathematicalstructuresgive di erent fundamentalequationsof questionisnotwhetherparalleluniversesexi st(Level I is theuncontroversialcosmologicalconcordanc emodel),buthow many discusshow multiversemodelscanbe falsi edandarguethatthereis a sever

Jan 23, 2003 · The cosmic microwave background allows sensitive tests of such nite models, but has so far produced no support for them | at in nite models t the data ne and strong limits have been placed on both spatial curvature and multiply connected topolo-gies. In addition, a spatially in nite universe is a generic

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  Cosmic, Background, Parallel, Microwave, Cosmic microwave background

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