Quantum Gravity & Dark matter

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1、GenRelativGravitDOI10.1007/s10714-011-1200-zESSAYAWARDEDBYTHEGRAVITYRESEARCHFOUNDATIONQuantumgravityanddarkmatterChiuManHo·DjordjeMinic·Y.JackNg©SpringerScience+BusinessMedia,LLC2011AbstractWeproposeaconnectionbetweenglobalphysicsandlocalgalacticdynamicsviaquantumgravity.Thesalientfeaturesofc

2、olddarkmatter(CDM)andmodifiedNewtoniandynamics(MOND)arecombinedintoaunifiedschemebyintro-ducingtheconceptofMONDiandarkmatterwhichbehaveslikeCDMatclusterandcosmologicalscalesbutemulatesMONDatthegalacticscale.KeywordsQuantumgravity·Darkmatter·ModifiedNewtoniandynamics·Entropicgravity1IntroductionT

3、hevexingproblemof“missingmass”hasbeenwithuseversinceZwickyfoundthattheindividualgalaxiesintheComaclusterwerezippingaroundtoofastforgravitytoholdthemtogetherinacluster.ThisproblemstartedtogettheattentionofthescientificcommunityafterRubinandhercollaboratorsdiscoveredthatthecloudsofhydrogengasins

4、everaldistantgalaxieswereorbitingthecenteroftheirFifthAwardinthe2011EssayCompetitionoftheGravityResearchFoundation.C.M.Ho(B)DepartmentofPhysicsandAstronomy,VanderbiltUniversity,Nashville,TN37235,USAe-mail:chiuman.ho@vanderbilt.eduD.MinicDepartmentofPhysics,VirginiaTech,Blacksburg,VA24061,USAe

5、-mail:dminic@vt.eduY.J.NgInstituteofFieldPhysics,DepartmentofPhysicsandAstronomy,UniversityofNorthCarolina,ChapelHill,NC27599,USAe-mail:yjng@physics.unc.edu123C.M.Hoetal.galaxiesataspeedfarexceedingwhatcouldbeaccountedforbythegravitationalpullduetothemassofvisiblebaryonicmatter.Thismassmismat

6、chhassincebeenastoundinglyconfirmedfromdwarfgalaxiestogalaxygroups.Asimplebutboldsolu-tionwouldbetopostulatetheexistenceofdark(invisible)matterthatmakesupthemassdifference[1].Thisapparentneedfordarkmatteratthegalacticscaleisevenmoreurgentatlargerscales.Darkmatterisneededtoaccountforthecorrectc

7、osmicmicrowaveback-groundspectrumshapes(includingthealternatingpeaks).Itisalsoneededtoyieldthecorrectlarge-scalestructuresandelementalabundancesfrombigbangnucle-osynthesis.(Supercomputersimulationssuggestthatthecosmoswouldlookverydifferentifd