Branes, Fluxes and Duality in M(atrix)-Theory
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We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
hep-th/9611202,PUPT-1668
Branes,FluxesandDualityinM(atrix)-Theory
arXiv:hep-th/9611202v3 10 Dec 1996OriJ.Ganor,SanjayeRamgoolamandWashingtonTaylorIVDepartmentofPhysics,JadwinHallPrincetonUniversityPrinceton,NJ08544,USAoriga,ramgoola,wati@puhep1.princeton.eduWeusetheT-dualitytransformationwhichrelatesM-theoryonT3toM-theoryonasecondT3withinversevolumetotesttheBanks-Fischler-Shenker-SusskindsuggestionforthematrixmodeldescriptionofM-theory.We ndevidencethatT-dualityisrealizedasS-dualityforU(∞)N=4Super-Yang-Millsin3+1D.WearguethatKaluzaKleinstatesofgravitonscorrespondtoelectric uxes,wrappedmembranesbecomemagnetic uxesandinstantonicmembranesarerelatedtoYang-Millsinstantons.TheT-dualitytransformationofgravitonsintowrappedmembranesisinterpretedasthedualitybetweenelectricandmagnetic uxes.Theidenti cationofM-theoryT-dualityasSYMS-duality
ingtheequivalencebetweencompacti edM(atrix)theoryandSYM,we ndanaturalcandidateforadescriptionofthelight-cone5-braneofM-theorydirectlyintermsofmatrixvariables,analogoustotheknowndescriptionoftheM(atrix)theorymembrane.
November,1996
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
1.Introduction
Duringthepasttwoyears,evidencehasbeenaccumulatingwhichindicatesthataconsistentquantumtheory(M-theory)underlies11Dsupergravity[1,2].Recently,anex-citingconjectureforamicroscopicdescriptionofM-theoryhasbeenputforwardbyBanks,Fischler,ShenkerandSusskind[3].TheBFSSmodelincorporatesinanaturalwaythenon-commutativenatureofmicroscopicspacetime[4]andthequantizationofthemem-brane[5].
Theauthorsof[3]haveshownthattheirmodelcontainsmanyofthefeaturesofM-theory:thesupermembrane,correctgravitonscatteringamplitudes,toroidalcompacti- cationandpartial11DLorentzinvariance.FurtherevidencefortheBFSSconjecturewassuppliedin[6]wherethebehaviorofamembraneina5-branebackgroundwasstudied.Questionswhichremainopenincludeageneraldescriptionofcompacti cation,anintrinsicdescriptionofa5-braneandacompleteproofof11DLorentzinvariance(asuggestioninthisdirectionhasbeenmadein[7]).
ThepurposeofthepresentpaperistopassM(atrix)-theorythroughonemoretestbyconsideringitsbehaviorunderT-duality.T-dualityrelatescompacti edtypeIIAtocompacti edtypeIIBsoinordertogetan“automorphism”ofM-theoryweneedtocompactifythetypeIIAtheoryonT2andapplyT-dualitytwice.ThisgivesaconnectionbetweenM-theoryonT3withvolumeVandM-theoryonT3withvolume1/V.Underthisduality,wrappedmembranestatesareexchangedwithKaluza-Kleinstatesofthegravitonandunwrappedmembranesbecomewrapped5-branes[8,9].
OurdiscussionbeginswithareviewoftheM(atrix)-theorydescriptionoftoroidalcompacti cationgivenin[3,10].TheresultingmodelisalargeNlimitofU(N)Super-Yang-Millstheory.Werecastthederivationinaslightlydi erentlanguageandexplainhowtwistedsectorsoftheU(N)bundleappear.WethenarguethatT-dualityisrealizedasS-dualityintheSYMtheoryandthatgraviton membranedualityisrelatedtoelectric magneticduality.Finally,wediscusssomeissuesrelatedto ndinganexplicitconstructionofthe5-braneinM(atrix)theory.
Thepaperisorganizedasfollows:Section2isareviewoftoroidalcompacti cationoftheM(atrix)-model.InSection3werelateS-dualityofN=4SYMtoT-duality.InSection4,thetransformationsofgravitonsintomembranesinM-theoryarediscussed.Werelatemembranestomagnetic uxesandgravitonswithKKmomentumtoelectric uxes.InSection5weusetheinterpretationofthemembranesintermsofmagnetic uxtoobtaintheenergyandcountingofmembranestates.WealsorelatetheYang-MillsinstantontoaEuclideanmembrane.InSection6wesuggestaformulationofa5-branewrappedaroundthelight-conedirectionsintermsofBFSSmatrixvariablessatisfyingacertainrelation.WealsodiscusstheimplicationsoftheT-duality/S-dualityequivalenceforthesearchfora5-braneinM(atrix)theorywhichextendsalong5transversedirections.
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
2.ReviewofCompacti cation
Onewayofunderstandingtoroidalcompacti cationofM(atrix)-theoryisbyconsid-eringasectoroftheN→∞0-branetheoryinwhichtheXmatricessatisfycertainsymmetryconditions.Thisdescriptionforcompacti cationonthed-dimensionaltorusTdcanbegivenasfollows[3,10]:In niteunitarymatricesUiarechosenfori=1...dthatcommutewitheachother,
UiUj=UjUi,(2.1)
andgenerateasubgroupofU(∞)isomorphictoZd.Thecompacti edtheoryisgivenbyrestrictingtothesubspaceofX’swhichareinvariantundertheZdaction:
Ui:Xµ →Ui 1XµUi+eiµ(2.2)
wheretheei’sformabasisofthelatticewhoseunitcellisTd.Thecountablyin nitedimensionalvectorspaceonwhichtheX’sactcanbewrittenasatensorproduct
V=VN Hd(2.3)
whereVNisanN-dimensionalspaceandHiscountablyin nitedimensional.Onecanthentake
Ui=I I1 ··· Ii 1 Si Ii+1 ··· Id(2.4)
whereIjistheidentityonthejthHandSiisashiftoperator
(Si)k,l=δk+1,l(2.5)
(theindicesk,lrunoverallintegersZ).ByrestrictingtheLagrangiantothesubspaceofX’sinvariantunder(2.2)oneobtainstheLagrangianfor(d+1)dimensionalSYMtheory.Thegauge eldsare
A(µd
i=1xi ei)=l1,...,ld∈Z e2πi lixiµX(0,l1)···(0,ld)(2.6)
d.Whend=3,theinversesquaredcouplingwhere eiformabasisofthedualtorusT
constantisthevolumeofT3(in11-dimensionalPlanckunits)andthe(3+1)-dimensional
3.theoryisde nedonthedualtorusT
Forlateruse,wewillrecastthederivationinadi erentlanguage.WenotethattheresultingmatrixXµinvariantunder(2.2)isjustthematrixoftheoperator
µ=i µ+Aµ
(2.7)
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
actingon eldsinthefundamentalrepresentation
φk(d i=1xi ei),k=1...N(2.8)
d.TherequisiteformoftheXmatricesiswhicharesectionsofthetrivialbundleoverT
k(n1...nd):obtainedbywriting µintheFourierbasisofφ
φk( xi ei)= k(n1...nd)eφ2πi
{ni} nixi.(2.9)
TheoperatorsUjcanbetakentoactonsectionsby
Ujφk( xi ei)=e2πixjφk(
From(2.7)itisclearthatifwealsotakeXµforµ=d+1,...,9tobethematricesoftheoperators
φ →Φµφ(2.11) xi ei)(2.10)
whereΦµarethescalar eldsofSYM,thentheBFSSLagrangianwillreducetotheSYMLagrangian.
3.CheckingT-duality
Anon-trivialdualityofM-theoryisobtainedbycompactifyingonT3,regardingthetheoryastypeIIAonT2andT-dualizingtwice(oncealongeachdirectionoftheT2).
3.1.ReviewofT-dualityforM-theory
WewillbeusingelevendimensionalPlanckunitslp=1.T-dualityonM-theoryisobtainedfromtherelations(hereGµνisthemetricincoordinates0,...,6,11.Notethatourspace-timecoordinatesarex0...x9,x11):
M theory
1/21/2R9Gµν;R9R7,R9R8;λst3/2R9=(3.1)
togetherwithtypeIIAT-dualitytwice(hereliarelengthsinstringunits):
TypeIIA
1 1 1 1gµν;l8,l9;l8l9λ(3.2)
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
Toobtain
(3.3)V2/3Gµν;V 2/3R7,V 2/3R8,V 2/3R9
whereV=R7R8R9(theRHSactuallycomesoutwithR7andR8switchedbutin(3.3)wehavecombinedare ection).ThiscanbegeneralizedtoslantedT3’sandtoincludethe3-formCµνρ[8]:1τ=iV7,8,9+C7,8,9 → M theory
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
3.2.T-dualityintheMatrixmodel
WehaveseenthatM-theoryonT3isequivalenttoN=4U(N)SYMonthedual 3:torusT
H=1
g
g26 2+θB21
A=1|DiΦA|2+
g2+θ
τ(3.9)
3arerescaledby(Imτ)2/3withoutagreeswith(3.4).Accordingto(3.3),thesidesofT
changingitsshape.ThankstotheexactconformalinvarianceofN=4Yang-Millswecan
3andde nethematrixmodelonaT 3ofvolume1.ThishastobeaccompaniedrescaleT
byrescalingofthesixscalarsXµbyV 1/3.TheS-dualXµshouldthusberescaledbyV1/3.SinceS-dualityofSYMmultipliestheHiggsVEVsbyV=1/g2we ndthataltogetherXµisrescaledbyV1/3.ThisisinaccordwiththeWeylrescalingofGµνin(3.3).
4.T-dualityactiononbranes
InthissectionweexaminehowtheactionofT-dualityonstatesismanifestedinthematrixmodel.SinceS-dualityexchangeselectricandmagnetic uxes,anaturalguessisthatelectric(magnetic)statescorrespondtograviton(membrane)states.
AsdescribedinSection3,boththewindingnumberofamembraneandtheKK
3.Moreover,momentumareparameterizedbyvectorsintheduallatticewithunitcellT
T-dualityexchangesthewindingandthemomentum.Electricandmagnetic uxesarealsoparameterizedbyvectorsintheduallattice.TheirexchangeunderS-dualityisinaccordwiththeiridenti cationwithbranes.Weshallnowexaminethecorrespondenceinmoredetail.
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
4.1.Reviewofelectricandmagnetic uxes
WerecallthatU(1)isanormalsubgroupofU(N)and
U(N)=(U(1)×SU(N))/ZN(4.1)
3.OnT 2 T 3wecanhavenon-trivialWewillconsiderU(N)Super-Yang-MillsonT
U(N)-bundles.StateswithoneunitofU(1)magnetic uxsatisfy:
tr{B}=2π.(4.2) 2T
Tobuildthecorrespondingbundle,wepick[11]:U 1V 1UV=e 2πi
NU 1φ(x+1,y)=V 1φ(x,y+1).(4.4)
Astatewithoneunitofelectric uxinthedirectionofS1 T3(whereS1issomecycleofthetorus)satis es: tr{E}=2π.(4.5)
S1
4.2.Fluxesandcompacti edM(atrix)-theory
Inthissectionweshowhowthemembraneof[3]naturallybecomesastatewithmagnetic uxaftercompacti cation.Toseethis,webeginbyshowinghowtwistedU(N)bundlesareobtainedfromtheconstruction(2.2).Theidenti cationofXµas(i µ+Aµ)attheendofSection2suggeststhatwewritethesameoperatorasamatrixactingonsectionsofthetwistedbundle.Giventhisidenti cation,wehave
[X7,X8]=[ 7, 8]=iB78
whereinthesectorwithoneunitof ux,B78isthescalarmatrix2π(4.6)
NyUφ(x,y),
φ(x,y+1)=Vφ(x,y),
(4.7)
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
where
U= 1
e2πi
N
U 1V 1UV=e , 2πi V= 111 .. . (4.8)
N(y+k+Np)x.(4.11)
|2<∞.So,Hereφissomearbitrarycontinuousfunctionde nedon( ∞,∞)with|φ
∈L2(IR)wecan ndthespaceonwhichXµisde nedisnowcontinuous(though,sinceφ
acountablebasisasbefore).
(w)we ndWritingXµinthebasisofφ
(X7)kl(w,w′)=2π
N)w′7ap+k l
N,
(X8)kl(w,w′)=iδ′(w w′)δkl s δ(w′+Np+k l w)e2πi(q+
p,q∈Z,s∈ZNN,q+s
N,q+
8sN)x2πi(q+es
Nx+
p,q∈Z,s∈ZN ap+k lNe2πi(p+k lN)(y+l)(4.13).
From(4.10)itisobviousthattheBFSSactiongoesovertotheSYMaction.TheU1andU2matriceswhichde nethesectorarestillgivenbymultiplicationbyeixandeiy.AsN×Nmatricestheyaredi erentfromthosefortheuntwistedsectorbecausetheyactonsections(4.11)ratherthanfunctions.ThusthereareseveralwaystoembedZdsubgroupswhicharenotmutuallyconjugate.
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
WealsonotethatthereisanotherwaytorealizethetwistedXµ’s.Forcompacti -cationsonT2,wetakeavectorspace(onwhichXµwillact)thatisaproductofa nitedimensionalvectorspaceVNofdimensionNandsingleHilbertspaceHwithacountablyin nitebasis
V=VN H.(4.14)
Notethedi erencebetween(4.14)and(2.3)–hereonlyonecopyofH(ratherthantwo)isusedforcompacti cationonT2.Thisdi erencemayberelatedtotheformoftheexpansion(4.11).WerealizeU1andU2as
U1=U eiP/√N,(4.15)
whereQ,ParecanonicaloperatorsactingonW([Q,P]=2πi)andU,Vareasin(4.8).U1andU2commuteandonecancheckthattheexpansionof(2.2)agreeswith(4.12).
Nextweshowtherelationbetweenelectric uxandgravitonstates.Theoperator
3isgivenbythatmeasuresthetotalelectric uxinsideT
Using
Xµ=i µ+Aµ,
wecanwritetheelectric uxas
tr{Ei}= ˙i=Tr{X˙i}=Tr{Πi}A(4.18)(4.17)tr{Ei}.(4.16) 3T 3T 3T
whereTristhetraceinthein nitebasisofthematrixmodel.Thus,electric uxinSYMnaturallycorrespondstomomentumalongthei-thdirectionoftheT3inM-theory.
5.Moreonmembranes
Inthissectionwedescribefurtherevidenceinfavoroftheidenti cationsbetweenmagnetic uxandLorentzianmembranes.WealsoproposeaconnectionbetweenYang-MillsinstantonsandEuclideanmembranes.
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
5.1.Energyandcountingofwrappedmembranestates.
ConsiderM-theoryonT2.Wewouldliketocalculatetheenergyofthemembraneusingthefactthatthemembranestatescorrespondtostatesinthesectorwithnon-zeromagnetic uxintheU(1)subgroup.In“mathematical”conventionswherethereisan
2overallgYMinfrontoftheaction,theunitof uxis
trB=2π.(5.1)
TakingBoftheformB0timestheidentitymatrix,we ndthat
B0=1
Ri.In
thissubsectionwerestorethe11DPlancklength
lp=g1/3√
α′
2 2gYM trB=2(2π) 4(R1R2)2
p2+M2= g√
g√g√α′T2(R1R2)2
α′duetothemomentum
alongR11tothekineticenergy.Thisexplainswhythesquareoftheareaappearsinthenumerator,andgivesthetensionofthemembrane,
T2=1
6(2π)4lp(5.7)
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
inagreementwith[3].
M-theoryonR9×T2shouldhave,for xedmomentumonR9,onenormalizableBPSmultiplet(annihilatedbyhalfthesupersymmetries)withthequantumnumbersofann-wrappedmembrane.Thisisknown[12]byusingtherelationbetweenM-theoryandtypeIIstrings.InthecontextoftherelationbetweenM-theoryandlargeNU(N)YangMills,andtheabovedescriptionofmembranewindingnumberasthemagnetic uxintheU(1)wecanarguethatthisistherightcounting.SoweneedtoknowthenumberofstatescomingfromlargeNU(N)YangMillswhichsitina28dimensionalrepresentationofsupersymmetryandcarrynunitsofmagnetic ux.Followingargumentsin[4]andin[13],andinagreementwiththediscussionattheendofSection4,preciselythisYangMillsquestionarisesifwewanttocountthenumberofnormalizableboundstatescarryingNunitsof2-branechargeandnunitsof0-branechargeintypeIIAtheory.Weknowthattheuniqueboundstate[14]ofNtypeIIA2-branescanbegivennunitsofmomentumalongtheeleventhdimension.Weconcludethatthereshouldbeaunique1/2BPSsaturatedstatecomingfromthesectorwithnunitsofmagnetic uxinU(N)YangMills.ThisstatementinthelargeNlimitshowsthatM-theoryonT2hasexactlyoneBPSmultipletcarryingthechargeofamembranewrappedntimesontheT2.
5.2.Euclideanmembranes
SinceLorentzinvarianceisnotmanifestintheBFSSformulation,itisinterestingtocheckwhataninstantonicmembranelookslike.SincetheMinkowskimetriciscrucialtotheIMFformulation,wewillthinkofaEuclideanmembraneasatransitionbetweentwodi erentvacuawhichwewillsoonidentify.Let’stakeaEuclideanmembranethatwrapsallofT3.Sinceitislocalizedindirections1...6,thecorrespondingSYMsolutionmusthaveallsixadjointscalarssettoascalarmatrix,say:
Φ1=···=Φ6=0.(5.8)
ThisallowsforanordinaryYang-Millsinstantonsolutioninthegauge elds.Itisthustemptingtoguessthatafullywrappedmembranecorrespondstoatransitionbetweentwovacuawhichdi erbyalargegaugetransformationrelatedtoπ3(U(N)).Infavorofthisclaimwerecallfrom(3.4)thattheθ-angleisrelatedtoC7,8,9.AmembraneinstantonthatwrapsT3isatransitioninwhich (inanappropriategauge):
dxd1 6dx11dtθ(5.9)
changesbyoneunit.Ifwereplaced
g2+iθ
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
6.5-branesinM(atrix)theory
Wenowdiscussseveralissuesrelatedtotheconstructionofa5-braneinM(atrix)theory.A5-branewhichextendsalongthelight-conedirectionsx±(andfourmoredi-rections)hasbeendiscussedin[6].However,the5-branedescribedbytheseauthorswasessentiallygivenasabackgroundforthe0-branetheory.Byusingtherelationbetweenthe0-brane eldsonatorusandthecovariantderivativeoperatoronthedualtorus,we ndanaturaldescriptionofthelight-cone5-branewhichisintrinsictothe0-branevariablesofM(atrix)theory.WealsodiscussthepossibilityofusingT-dualitytodescribea5-branethatoccupies vetransversedirectionsandisboostedalongtheBFSSpreferreddirection.
6.1.Thelight-cone5-brane
ItwasshownbyWitten[15],andinamoregeneralformbyDouglas[16],thataninstantonona(p+4)-branecarriesp-branecharge.Thisresultisessentiallyduetothefactthattheworldvolumetheoryonthe(p+4)-braneincludesaChern-Simonsterm
C∧eF.(6.1)
Σp+5
whereCisasumoverRR elds.Theterm
C(p+1)∧F∧F(6.2)
inparticularcouplesaninstantontothe eldC(p+1),underwhichp-branesareelectricallycharged.Asoneapplicationofthisresult,YangMillsinstantonsembeddedinathree-braneworld-volumetheoryappearasD-instantons.AfteraT-dualitywhichconvertsthreebranestozerobranes,theseD-instantonsareconvertedtomembraneinstantons.Relatingthistothetransformationfromthe0-branevariablesofM-theoryonT3totheYangMillsvariables,thisgivesanotherpieceofevidenceinfavouroftheidenti cationproposedinsection5.2.
Wecanusethissametypeofrelationtoshowhowa5-braneofM-theorycanbeconstructeddirectlyfromtheXmatrix eldsofBFSS.Wrappingthe5-branearoundthelight-conedirections,weshould nda4-braneintheresultingIIAtheory.Letuscompactifyindimensions6-9.Sincea4-braneonatorusT4goestoa0-braneonthedual
4,theconnection(2.7)indicatesthatacon gurationoftheXmatricessatisfyingtorusT
Tr ijklXiXjXkXl=8π
(6.3)
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
willhaveaunitof4-branecharge.(Theindicesi laresummedoverthecompacti edcoordinates6-9.Theantisymmetricproductof4X’sisjust1
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
7.Conclusions
WehaveseenthatT-dualityisrealizedinanaturalwayintheM(atrix)-theoryofBFSSasS-dualityoflargeNU(N)N=4Yang-Millstheory.Thelarge/smallvolumedualityofM-theoryismappedtotheweak/strongcouplingdualityofSYMandgraviton(0-brane)/membranedualityismappedtoelectric/magneticduality.Wehavealsoseenthattherearedi erentinequivalentembeddingsoftheZdsymmetrygroupoftranslationsintheBFSSmodel.Thedi erentembeddingsgiverisetodi erentU(N)bundlesintheSYMtheory.ThewrappedmembraneofM-theoryisidenti edwithstatescarryingmagnetic ux.
Theconnectionsdevelopedinthispaperprovideanaturalframeworkinwhichtotrytounderstandthe5-braneinM(atrix)theory.Theunwrapped5-braneisnaturallyrelatedthroughS-dualityof3+1dimensionalSuper-Yang-Millstheorytoa2-branecon gurationwhichcanbeunderstoodinmatrixvariablesX.Furthermore,the5-branewrappedaroundthelight-conedirectionshasanaturaldescriptionasan“instanton”of4+1dimensionalSuper-Yang-Mills,whichallowsustodescribeitintermsofasetofmatrixvariablessatisfyingtherelationTr ijklXiXjXkXl=8π.InthelanguageoftypeIIAstringtheory,thefactthatitispossibletodescribethe4-braneintermsoffundamental0-brane eldsisessentiallytheT-dualoftheresultthatinstantonsona4-branecarry0-branecharge.Remarksalongtheselineswerealsomadein[17].Itwouldseemthattheabilityof0-branestoformthehigherdimensionalbranesofM-theoryisastrongargumentinfavoroftheconjectureofBFSSthatinfact0-branesformacompletedescriptionofallthedegreesoffreedominM-theory,atleastintheIMFframe.
Acknowledgments
WewishtothankA.Hashimoto,R.Gopakumar,D.J.Gross,I.Klebanov,G.Lif-schytz,S.MathurandE.Wittenforhelpfuldiscussions.OJGisalsogratefultoT.BanksforadiscussionduringtheRutgersUniversitytheorygroupmeeting.TheresearchofSRandWTissupportedbyNSFGrantPHY96-00258andtheresearchofOJGissupportedbyaRobertH.DickefellowshipandbyDOEgrantDE-FG02-91ER40671.
Noteadded
Asthisworkwascompleted,apaperbyL.Susskind[18]appearedwhichdiscussesthesameissue.
We use the T-duality transformation which relates M-theory on T^3 to M-theory on a second T^3 with inverse volume to test the Banks-Fischler-Shenker-Susskind suggestion for the matrix model description of M-theory. We find evidence that T-duality is realiz
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th/9611164
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