Theoretical Research On Dark Matter Particles And Nuclear Magnetic Form Factor

In this dissertation,we studied some problems on Dark Matter(DM)and Nuclear Physic-s.For DM Physics,we studied two DM particle models:axion-like-particle(ALP)model and massive graviton mediated DM model,we also used DM annihilation and DM decay model to interpret the the peak in DArk Matter Particle Explore(DAMPE)electron data.For Nuclear Physics,we studied the one-pion exchange current effects on the magnetic form factors in the formalism of relativistic mean-field(RMF)theory.DM is a matter of concern to both astronomy and particle physics.Under the s-tandard model of cosmology,DM accounts for 27%of the total energy and 84.5%of the total matter in the universe.So far,DM is only observed by gravitational astro-nomical phenomenon,for example the rotation curve of galaxies,cosmic microwave background radiation,etc.If there are other interactions between the DM particles and Standard Model(SM)particles in addition to gravitational interaction.we can pro-duce DM particles by the accelerator.And we can also observe the products of the annihilation or decay of DM particles.Until now,DM particles still have not been observed yet.In 2012,the European Center for Nuclear Research(CERN)found the Higgs particle.All particles of the particle physical standard model are found at this point.However,our understanding of particle physics is not complete.A variety of particle models beyond the SM are getting more and more attention.DM particles are generally considered to be particles beyond the SM.Now there are a lot of DM can-didates,for example,the Weak Interacting Mass Particles,Axion,sterile neutrino etc.The WIMPs are considered as the most promising DM candidates.The most common weak interaction heavy particles are the lightest supersymmetric particles in the su-persymmetric models,and the lightest Kaluza-Klein particles in the extra dimensional models etc.The axion is proposed to solve the Axion CP problem in quantum chromo-dynamics.As the detectors designed for the WIMPs have no obvious DM signal,DM candidates such as axions and axions-like-particles(ALP)are getting more and more attention Searching for DM signals in ?-ray has been an effective methods of DM de-tecting.Therefore,based on ?-ray,we studied the ALP model and massive graviton mediated DM model.Last year,the DArk Matter Particle Explorer(DAMPE)released its first total electron data.Peak in the electron data that may come from DM have re-ceived extensive attentions.Here,we study the possibility of dark matter interpretation of DAMPE data.Electron-nuclear magnetic scattering is an important experimental method to s-tudy the current distribution in the nucleus.From the scattering,we can directly extract the magnetic form factor related to the current distribution of in the nucleus.And the RMF is a very successful nuclear structure model.Before in the formalism of RM-F theory,the magnetic shape factor obtained by the single particle approximation is somewhat different from the experimental data.Therefore,we studied the one-meson exchange current effects on the magnetic form factors in the formalism of RMF theory.The specific works in this dissertation consist of the following four parts:· We searched for ALP signals in the ?-ray from active galactic nucleus(AGN)and supernova remnants.From generation to observation,?-rays pass through different regions,such as clusters of galaxies,extragalactic space and the Milky Way.We considered the effect of photon-ALP conversion to-?-ray spectrum.As a result of photon-ALP conversion,there will be some irregular structure in the?-ray spectrum obversed by-?-ray detectors.Based on the spectrum data from the Fermi Large Area Telescope(Fermi-LAT),we searched for possible ALP signals,and constrained the parameter space of ALP.In the study of 7-rays from AGN PKS 2155-304,we successfully excluded some ALP parameter regions of suspected signals.While in the study of ?-rays from supernova remnants,we found a possible ALP signal.The studies on ALP provide as references to the future ALP detect experiments.· we studied massive graviton mediated DM model.We considered various exper-imental limitations of this model,including constraints of accelerators on new physical and dark matter,Fermi-LAT and H.E.S.S constraints on DM annihila-tion cross sections to ? ray lines,and limit on the DM relic density.Based on these constraints,we obtained the parameter regions that satisfies all restrictions.At the same time,possible effects of the future ? ray detectors on this model were also studied.· We studied the dark matter interpretation of the peak in the DAMPE electron data.We found that if there is a near enough and large enough dark matter sub-halo around the solar system,the annihilation and decay of DM particles in this sub-halo can explain peak in the DAMPE electron data well.· we studied the effects one-pion exchange currents on the magnetic form factors in the formalism of RMF theory.We found that the magnetic form factors with one-meson exchange currents agree better with experimental data under RMF theory.Combined with the root mean square(RMS)radii of the valence nucleon orbits data,We proved that one-meson exchange currents should be taken into account during the calculation magnetic form factors in the formalism of RMF theory.