1、重慶大學碩士學位論文基于Stachel弦宇宙理論的均勻但各向異性BianchiⅠ型宇宙精確解姓名：易贏申請學位級別：碩士專業(yè)：理論物理指導教師：李芳昱20070410重慶大學碩學位論文英文摘要ABSTRACTSincethediscoveryofGeneralRelativityCosmologystartedtoattractscientists’intensiveattentionNoonewoulddenythatEinstein

2、wasthefounderofcosmologYHefirstproposedthecosmologyprinciples，thewholeuniverseishomogeneousandisotopicandtheonlyforcethatleadsthecosmologydynamicsisgravityisstillthoughttobethebestdescriptionofouruniverseHoweverthosekind

3、sofcosmologymodelscan’texplainproblemslikethegalaxyformationThereforepeoplestartedtostudythemodelslikeBianchitypecosmologymodels，whicharemoregeneralcosmologymodelsTheyarehomogeneousbutanisotropicuniverse，inhomogeneousand

4、anisotropicuniverse，andinhomogeneousbutisotropicuniverseSinceitisalwayspossibleforUStoassume001“universeisahomogeneousbutanisotropicuniverseTheleftquestionisthatwhichtheoryshouldweuse，generalrelativityorquantumfieldtheor

5、yAsweallknowgeneralRelativityhasitsgreatachievementtopredictphenomenalikeradardetentionanditispreciseatlargescale，butwhenitcomestosmallscaleandhighenergyitfailsandquantumtheorybecomeimportantSomescientiststllillI【thatthe

6、remightbeanunifiedtheorytoexplainthefourforces(strongforce，electromagneticforce，weakinteraction，andgravity)inoneframeworkanddidalotofamazingworkonitCurrentlytherearethreeprospectivetheories：loopquantumgravitystringtheory

7、andsupersymmetryItisalwaysahottopictojudgethesetheoriesInthisthesis1willuseStringtheorywhichisthoughttobeaprospectivetheoryofgravitythatdoesn’tcontradictquantumtheoryInthisthesis，Ifirststudiedthesuitabilityofusingstringc

8、osmologytheoryThen1willapplyitintoBianchitypeIcosmologymodelwhichisthoughttobeareasonableexplanationofouruniverseatleastintheearlyepochofevolutionThenIobtainedaclassofexactsolutionsA1lastIcategorizedthesolutionsachievedb

9、ysomeotherresearchersandanalyzedthemwithcertainrestrictionsliketheenergycondifionobservationalphenomena(HubbleRelation)andSOonBecauseInoticedtherearealotofexactsolutions，whichtheyarebarelystudiedSomeofthesolutionswillbea

10、bandonedforsureTherearetwofoIdmeaningtostudythis：firstitmightbeaprospectivewaytocheckthestringtheoryindirectlyviatheobservationincosmologicalexperiments；secondlyitmightshedsomelightontheunderstandingofOuruniverseIanalyze