From Supernovae to Baryon acoustic Oscillations来自超新星的重子声学振荡-精品文档ppt课件.ppt

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1、FromSupernovaetoBaryonAcousticOscillationsPatriceOKOUMASupervisor:Prof.BruceA.BASSETTUCTDec.2019SKAPostgraduateBursaryConferenceOverviewTheoreticalWorkObservationalWorkDataAnalysisAdiabatic&IsocurvaturemodesonBAOType-IaSupernovaeMeerKAT/SKASALTAType-IaSupernovae(SNeIa)--

2、----->ExplosionofaWhiteDwarfhavingaccretedmassfromacompanionstar,beyondacriticalthresholdknownastheChandrasekharlimit(~1.4Solarmasses).AreminderSiliconLineFolatelli(2019)SNeIaasstandardizablecandleKrisciunasetal.,2019SpectralcharacterizationofType-Iasupernovaeviachi-square

3、dbasedtechniquesandcross-correlationapproach(SNIDbyBlondinetal.2019)------------>M.Sc.Apastworkchi-squaredapproachcross-correlationapproach(SNIDcode)2-weekcampaignforInfraredlightcurvesofSneIa(IRSF,Sutherland,SA)WorkwithArielGoobar&al.(Sweden)Extinctionscorrectionsforopti

4、calobservations----->MajoruncertaintyinusingSNeIaforcosmologyInNIR,SNe-Iaarestillstandardizablecandles(Krisciunasetal.,2019)SmallerextinctioncorrectionsStrongevidenceforaweakerlightcurvewidth-brightnesscorrectionLowererrorbudgetBetterconstraintsontheCosmology2-weekcampaig

5、nforopticalspectraofSne(1.9-mtelescope,Sutherland,SA)Workwith.Y.Fang&al.(Michigan,US);A.Goobaretal.(Sweden)Goals:Training;TestingsimultaneousidentificationoftransientsfromROTSE(rotse/),inGamsberg(southernNamibia).TheoreticalWorkObservationalWorkDataAnalysisAdiabatic&Isocu

6、rvaturemodesonBAOSupernovaeMeerKAT/SKASALTNumberdensityand/orenergydensitycharacterizecosmologicalspeciesintheearlyUniverse.LinearperturbationsofthesequantitiesareTheEarlyUniversethroughBaryonAcousticOscillationsWorkwithK.Moodleyetal.(UKZN,SA)&C.Zunckel(Princeton,US)METRIC

7、perturbationsEqs.forevolutionofperturbationsTHENAdiabaticmodesareperturbationsaffectingcosmologicalspeciessuchthat:Isocurvaturemodes:CMB(forflatUniverse)===>AdiabaticmodesaredominantBUT~10%Isocurvaturemodesareallowed(inearlyUniverse).S.White(2019)Therefore,IfweassumeAdiaba

8、ticfluctuations,whatdowegetwrongaboutDarkEnergy...and...byhowmuch?BaryonAcousticOscillati