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1、引力波与高频引力波探测李芳昱重庆大学物理系China-VO2009ICGA91BackgroundandMotivationCouplingElectromagneticDetectionSchemetoHigh-FrequencyGravitationalWavesChallengeandOpportunityOUTLINE2BackgroundClassificationofgravitationalwavefrequencybands.(1)ν~1Hz-104Hz,thedetectingregionbygrou
2、ndlaserinterferometergravitationalwaveobservatory,suchasVIRGO,LIGO,etc.(2)ν~100Hz-103Hz,thedetectingregionbytheresonantmassdetectors,suchasWeberBar.(3)ν~10-4Hz-1Hz,thedetectingregionbyLaserInterferometerSpaceAntenna,suchasLISA.(4)ν~10-6Hz-10-3Hz,thedetectingregi
3、onbyASTROD.(5)ν~107Hz-109Hz,thedetectingregionbyelectromagneticmicrowavecavityorcircularwaveguide.(6)ν~108Hz-1011Hz,thedetectingregionbycouplingsystemsofthemicrowavebeamsandstaticEMfields.3WhatareHigh-FrequencyGravitationalWaves(HFGWs)?HighFrequencyGravityWaves(
4、HFGWs)aregravitationalwaves(whichdifferfromhydrodynamicgravitywaves)thathavefrequenciesof100kHzto100MHz(HawkingandIsrael1979).Astheirfrequencyincreases,veryhigh-frequencygravitationalwaves(VHFGWs)andultrahigh-frequencygravitationalwaves(UHFGWs)aregenerated.These
5、havefrequenciesof100MHzto100GHzand100+GHz,respectively.ThegenerictermHFGWsdescribesallthreeofthesebands.Thesewavesmovethroughthe“fabric”ofspacesimilartothewayanoceanwavemovesthroughthewater.This“fabric,”asEinsteindescribesit,iscalledthe“space-timecontinuum”andis
6、four-dimensional.Itcontainstheusualthreedimensionsofspace:forexample,(1)east-west(2)north-south)(3)updown,butalsoincludesthedimensionof(4)time.4HistoryofHigh-FrequencyGravitationalWavesPoincaré,firstmentionofGWs,1905RobertL.Forward,lecturepresentedattheLockheedA
7、strodynamicsResearchCenterinBel-Air,California,USA,firstmentionofHFGWs,1961M.E.Gertsenshtein,1962L.HalpernandB.Laurent,relicHFGWsfromBigBang&GASER,1964RichardA.Isaacson,1968LeonidGrishchukandM.V.SazhinHFGWemission,1974G.F.Chapline,J.NuckollsandL.L.Woods,nuclearg
8、eneration,1974V.B.BraginskyandValentinN.Rudenko,detectionandlaboratoryHFGWgeneration,19781979StevenW.HawkingandW.IsraeldefinitionforHFGWsashavingfrequenciesinexcessof
