25981.mcg暗能量模型在球塌縮理論下對宇宙結構形成的影響

1、遼寧師范大學碩士學位論文MCG暗能量模型在球塌縮理論下對宇宙結構形成的影響姓名：蘇洋洋申請學位級別：碩士專業(yè)：理論物理指導教師：吳亞波2012MCG暗能量模型在球塌縮理論下對宇宙結構形成的影響EffectsofmodifiedChaplygingasasdarkenergyonstructureformationinuniversebyusingsphericalcollapsetheoryAbstractInrecentyears，t

2、heaccurateobservationdatafromSNeIa，WMAPandSDSSlndicatethattheexpansionoftheuniverseisaccelerating，whichbecome；oneofthepopularquestionsofthephysicsButthisresultseemtoconflictwiththestandardbigbangcosmologicalmodelwhichisf

3、amilartousInordertoalleviatethecontradiction，manytheorieshavebeenproposedTherearetwomajorkindsofmainlinecorrectionmethod：oneisintroducingnewcomponentofcosmicwhichiscalleddarkenergywithnegativepressure，whichisahomogeneous

4、distributioninthebigscalestructureTheintroductionofdarkenergyiSactuallyacorrectionoftherightofEinsteingravitationalfieldequationAlternativetoit，wecanconsidermodifyingthepartofgeometryintheleftoftheEinstein’SequationInthi

5、stext，wewillfurtherinvestigatetheeffectsofmodifiedChaplygingasonthestructureformationofuniverseinaflatuniverseThebackgroundknowledgeofmoderncosmologyisfistintroduced，andwereviewthestandardcosmologymodelthenbrieflygivethe

6、summariesofthecurrentestablishedvariousdarkenergymodelNextweintroducethesphericalcollapsemodelandclusterclusternumbercountsinstructureformation，whichcouldcombinetheparametersofmodelwithobservationdata，consequentlydisting

7、uishingandestimatingvariousdarkenergymodelsSointhethirdpartwespecificallyintroducetherelatedresearchtheoryandmethodInthefollowingsection，weselectmodifiedChaplygingas(MCG)modeltospecificapplicationofthetheoryAfterreviewin

8、gtherelevantdynamicevolutionofMI。aGwediscusstheinfluenceofMCGasdarkenergytostructureformationwiththesphericalcollapsemodelinnon—linearregime，anddividethenonlinearprocessintotwophases，thefirstprocessisfromformingsmalldens

9、itycontrasttoexpandinguntilturnaroundstateThesecondprocessiSfromturnaroundstatetovirialation弭臺respectivelydiscuss曲edensitycontrastoftumaroundandvirialation，andcomparetheresultswithGCG，LCDM，Einstein—desitterForthelinearre

10、gime，wejustchoosesomecosmologyparameterstesearch，andmakethecontrastwiththeobservation，theresultconsistswellwithobservationThereforthemodelofmodifiedChaplygingasasdarkenergycouldexplaintheacceleratinguniversewellinlineara

11、ndnon—linearperturbationsFinallyweusePressshcetermassfunctiontocalculatetheevolutionoftheclusterabundanceindifferentrangesofmassandcontrasttheresultwiththestandardLCDMmodel，GCGmodelandparameterizeddarkenergymodelKeywords