Absorption And Scattering From Schwarzschild Black Hole With Cosmic String And Extremble Changed Black Hole Spacetime

Black holes are formed of massive stars by gravitational collapse.It is very important for us to understand the black hole information by studying the scatter-ing and absorption of particles in different time.After the cdiscovery of Hawking radiation in 1970s,Study on the absorption and scattering of quantum wave by black hole.Recently,the study of string theory has aroused people's interest in the study of the absorption cross section of the black hole and the black hole with string theory.String theory can Quantum gravity,and can explain the origin and operation of the universe and many problems of modern physics.Because of t.he extension,the black hole space-time obtained by the string theory is different from that in the general relativity.So people are very concerned about the research of the time and space.It is very important to study the scattering and absorption of the time and space of the telescopic son to the black hole,string theory and related theories.In the second chapter,we use the quantum scattering theory to analyze the Schrodinger wave equation of the universe is a black hole piercing strings and nu-merical study on the absorption cross section and scattering cross section.We found that the linear density of the string ? the universe low absorption cross sectioin.We also found that the absorption cross section value of high-frequency oscillation on geometrical optics regime and the existence of cosmic strings make weak ab-sorption cross section low frequency brand and this effect is more apparent in the low-frequency regime.We found that cosmic strings make weak scattering light dis-tribution and scattered direction and narrow glory exists in a backward direct ion.In a fixed-frequency,glory glory is height and narrow width due to cosmic strings.In the third chapter,we establish a single black hole kind of massless scalar wave Schrodinger Equation,the using partial-wave method is used to locate a black hole absorbs and numerical solution of scattering cross section.We found that:1)with the coupling parameter of ? increases,total absorption cross sections the same smaller;2)with the angular momentum quantum number l Increases,the angle of scattering angle narrows,and differential scattering cross section will accordingly become higher.