一種依賴于額外維的宇宙加速機制和六維RS模型.pdf

1、北京工業(yè)大學碩士學位論文一種依賴于額外維的宇宙加速機制和六維RS模型姓名：馮勝飛申請學位級別：碩士專業(yè)：理論物理指導教師：黃永暢20070515AbstractAbstractInthisthesisfirstlywereviewedthehistoryandtheprogressoftheStandardCosmologyandtbemotivationwhytheRandallSundrummodelWItSproposedandt

2、hedevelopmentofitBasedontheresultsoftheformerexploiterswemadeftlt01el“reaseachontheproblemoftheaccelerationof紕universeandgaveproposeofusWeresearchedthegt∞na／loof6DRandallSundrummodel，andfoundsomesignificativeresultsThist

3、hesiscomprisestwopartsinthefirstpartinordertodealwiththepuzzleofthelattertimeaccelerationoftheuniversewefindanewmechanism；inthesecondpartthe6dimensionalRandall—StmdrummodelWasdiscussedPfirtI：WemodifytheFRWmodelbymakingth

4、ecosmologicalscalefactorRbeafunctionofthecoordinateoftheextradimension而，thenweobtainakindof5DmetricsWhen而isafunctionoftime，the5Dmetricsreduceto4DformThesignaturesofthis4DmedicscanbechangedintheevolvememoftheuniverseAndwe

5、showthatthereexistsadualitybe“嗍lthechanged4DmetricsandLorenlzianoBesandthecurvaRuesofthetwokindsofmetricsalereversed(嘉一七)ItisthisdualitythatgivesUSawaytoalleviatetheproblemoflatertimeacceleratedexpR璐ionoftheuniverseWe#ve

6、notorgythesolutionsofEinsteinequationsofth／smodelbutalsodiscussionofthesolutionindifferentcasesPartⅡ：OurscenarioisageneralizationofthetwobraheRandallSundrummodelhRS’smodelthewarpfunctiononlydepend011onevariable，inourscen

7、ariothewarpfunctionhastwovariablesicthetwoextradimensionsTherearetwodramaticdiscoveriesafterthisgeneralizationThefirstoneisthatthecosmologicalparameterdistributesinthetwoextradimensionsinaformofaclusterofcircleswhenthere