磁化黑洞吸積盤(pán)的提能機(jī)制及其在天體物理中的應(yīng)用.pdf

1、華中科技大學(xué)碩士學(xué)位論文磁化黑洞吸積盤(pán)的提能機(jī)制及其在天體物理中的應(yīng)用姓名：雷衛(wèi)華申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：理論物理指導(dǎo)教師：汪定雄2002.6.25華中科技大學(xué)碩士學(xué)位論文ABSTRACTThreetypesofenergymechanismrelatedtoblackhole(BH)accretiondiscareinvestigatedinthispaper(1)Accretionprocessinwhichmatterfallsi

2、ntothecentralblackholeafterleavingtheinneredgeofdisk，resultinginincreaseofmassandangularmomentumofthecentralblackholeandtransferringitsgravitationalenergyintadiationenergyofthedisk(Inthisarticleweonlydiscusstheprogradeac

3、cretionprocess，thatmeanstheaccretionflowisinthesarnedirectionasaspinningblackhole)；(2)TheBZprocessinwhichtheBHhorizonandtheremoteastrophysicsloadareconnectedbytheopenmagneticfieldlines，andenergyandangularmomentumareextra

4、ctedfromtherotatingBHandtransportedtOtheremoteload；(3)Magneticcoupling(MC)process，inwhichtheBHhorizonandthediscareconnectedbyclosedmagneticfieldlines，andenergyandangularmomentumaretransportedbetweenBHanddiscTheBZandMCpow

5、erandtorqueCanbeexpressedinaunifiedformulawhichisderivedfromanimprovedequivalentcircuitWefindthattheexpressionsforBZandMCpowerarealmostthesameexceptthattheparameterdefinedastheratiooftheangularvelocityofthemagneticfieldl

6、inestOtheBHhorizon，forMC，thisparameterisdeterminedbyafunctionofBHspinandtheradialcoordinateofthedisc，butforBZ，itisuncertainduetOlackoftheknowledgeabout‘theremoteastrophysicsload’ItiswellknownthatrotatingBHisahugeenergyso

7、urce，inwhichtherotatingenergyCanbeextractedbyBZandMC，thusBZandMCareimportantforhighenergyastrophysicsBZmechanismCanbeagoodcandidatetoprovidethepowerfulenergyoftheGammamyburst(GRB)intheobservedtimeintervalupto1000孽ifastro

8、ngenoughfield(B～10”gauss)ontheBHCanbesupportedbythesurroundingaccretiondiscWhileinMC，theenergyandangularmomentaretransportedbetweenBHandthedisc，whichwillremarkablyaffecttheparametersonthediscsuchastheenergyfluxandthedisc