Strong Gravitational LensingSourceplanesplanHST·WFPC2GalaxyClusterAbell2218KObserverNASA,A.FruchterandtheEROTeam(STScl)·STScl-PRC00-084元(0)Dds4GMHEQ=Qc2DsC2E
Strong Gravitational Lensing
Weak Lensing mass reconstructionImage ellipticity-> shear->Dα=VbKinvert theequation0-0d?g'α(0)=0-012元JR?RXJ1347.5-1145(Bradac etal2005)
Weak Lensing mass reconstruction RXJ1347.5-1145 (Bradac et al 2005) Image ellipticity -> shear-> invert the equation
Cosmological scalethe WMAP resultSpergel et al 2003WMAP Combinedfit:1.00.80.80.60.6aa0.40.4Qmh2=0.135+-0.009WMAPonlyWMAPext0.20.20.00.02m=0.27+-0.040.00.20.40.60.81.00.00.20.40.60.81.0Om0m1.01.0SN0.80.8Resultsdependon0.60.6a0WMAPext+HSTWMAPext+HST+SNSupernovae and Hubble0.40.495%0.20.20.00.0constant data.0.00.20.40.60.81.00.00.20.40.60.81.00mOm
Cosmological scale the WMAP result Spergel et al 2003 mh 2=0.135+-0.009 m=0.27+-0.04 WMAP Combined fit: Results depend on Supernovae and Hubble constant data
AngularScale600015000() 2/0(1)Non-baryonic1000Powe(2 0(1+)From BBN and CMB, it has2gh2=0.02+-0.002.10800Multipolemoment()0.010.020.030.26TTTTTETherefore, most dark0.25matter should be non-0.240.23baryonic.roe2pmh2=0.113+-0.00910~H/oHe010-0H/rle10-1010-1010-9baryon-to-photon ratio n
Non-baryonic From BBN and CMB, it has Bh 2=0.02+-0.002. Therefore, most dark matter should be nonbaryonic. DMh 2=0.113+-0.009
Nature of the dark matter-Hotor cold- Hot dark matter is relativistic at the collapse epochand free-streaming out the galaxy-sized overdensity. Larger structure forms early andfragments to smaller ones. Cold DM is non-relativistic101100at de-coupling, forms10-1structure in a hierarchical10sadSmell scelesbottom-up scenario10STIOUHDM10HDM is tightly bound fromCDM10observation and LSS formLlt100.0010.010.1Inverse Length Seale [ (Mpe/h]tion theory
Nature of the dark matter—Hot or cold ◼ Hot dark matter is relativistic at the collapse epoch and free-streaming out the galaxy-sized over density. Larger structure forms early and fragments to smaller ones. ◼ Cold DM is non-relativistic at de-coupling, forms structure in a hierarchical, bottom-up scenario. ◼ HDM is tightly bound from observation and LSS formation theory