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Research On Gamma-ray And Electron Spectra Of High-Energy Cosmic Rays

Posted on:2022-11-07Degree:MasterType:Thesis
Country:ChinaCandidate:Z C ZhengFull Text:PDF
GTID:2480306776993109Subject:Crop
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High-energy cosmic rays have been a hot topic of study since they were detected in the last century,and people are most concerned about their production mechanism.High-energy cosmic rays include gamma rays,electrons,nucleons etc.In recent years,the detection of gamma rays and electron have been more accurate,the energy range is wider,and the detection results have shown new abnormal behaviors.Unlike traditional models,we use the gluon condensation theory to explain the mechanism of gamma spectroscopy,and through analysis we find that the gamma spectra of some active galactic nuclei,pulsars,and gamma bursts conform to the above theory.For electron spectra,we also use the theory of gluon condensation to explain the mechanism of its generation.Gluon condensation is a new theory proposed in recent years,which is based on the BFKL equation.By using the time ordered perturbative theory(TOPT)to derive the gluon recombination effect and nonlinear corrections of the equation,they obtained the ZSR equation.Calculations have found that when the Bjorken variable x is below a certain critical point,the ZSR equation will have a chaotic solution,and interestingly,the strong chaotic oscillations will cause strong shadowing and anti-shadowing effects,which accumulate the gluons to a special momentum state,which is the phenomenon of gluon condensation(GC).In the event of gluon condensation,the products of hadron collisions exhibit unusual energy spectra.By using the gluon condensation model,this work mainly accomplished the following works:(1)Interpreted some gamma ray spectrum from active galactic nuclei,gamma bursts,and pulsars.The active galactic nuclei represent a large number of extragalactic objects,characterized by the production of extremely bright electromagnetic radiation in a very compact volume.Active galactic nuclei with relativistic directional jets(called blazars)are very efficient sources of Te V gamma rays,and the gamma ray spectra from blazars show a broken power-law behavior that can be explained using the gluon condensation model,for example the recently recorded sub-Te V gamma ray spectra of GRB180720 B and GRB 190114 C.For high-energy gamma rays of pulsars,the radiation mechanism is generally thought to be dominated by the lepton scheme because of the weaker proton flux around the pulsar.However,gluon condensation predicted by the nonlinear QCD evolution equation may greatly enhance the cross-section of the proton-target interaction and produce a feature of broken energy spectrum,such a mechanism can be used to interpret some of the gamma ray spectrum from pulsars.(2)Explained the electron spectra of cosmic rays,including its production mechanism and the differences between different experiment groups.The positron and electron fluxes detected by AMS02,CALET,DAMPE,and FermiLAT show their complex structures that deviate from a single power-law behavior,which we used the gluon condensation model to explain.Further studies of experimental data on positive and negative electron fluxes found that the results of DAMPE and Fermi-LAT are significantly higher than those of AMS02 and CALET in the range of 100 Ge V–1Te V.We pointed out that the positron and electron flux can be attributed to two hadron sources which produced by gluon condensation effects and a natural background,and that the difference between the two sets of data can be explained by the theory of anomalous bremsstrahlung.
Keywords/Search Tags:Gamma Ray Theory, Ultra High Energy Cosmic Rays, Electron Spectrum, Bremsstrahlung
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