Periodic wave solutions to the dispersive long-wave equations are obtained by using the F-expansion method, which can be thought of as a generalization of the Jacobi elliptic function method. In the limit case, solita...Periodic wave solutions to the dispersive long-wave equations are obtained by using the F-expansion method, which can be thought of as a generalization of the Jacobi elliptic function method. In the limit case, solitary wave solutions are obtained as well.展开更多
The nucleon-nucleon cross sections in the dense nuclear matter are microscopically calculated by using Dirac- Brueckner-Hartree-Fock （DBHF） approximation with different covariant representations of the T-matrix, i.e...The nucleon-nucleon cross sections in the dense nuclear matter are microscopically calculated by using Dirac- Brueckner-Hartree-Fock （DBHF） approximation with different covariant representations of the T-matrix, i.e., complete pseudo-vector （CPV）, pseudoscalar （PS） and pseudo-vector （PV） choices. Special attention is paid to the discrepancies among the cross sections calculated with these different T-matrix project choices. The results show that the medium suppression of the cross section given by DBHF in the CPV choice is not only smaller than those obtained in both PS and PV choices, but also smaller than the predictions with a nonrelativistic Brueckner-Hartree-Fock （BHF） method including three body force （3BF）. The further analysis reveals that the influence of the different choices on the cross section in the DBHF approximation is mainly determined by the state of smaller total angular momentum due to the medium effect being strongly suppressed in the higher angular momentum.展开更多
文摘Periodic wave solutions to the dispersive long-wave equations are obtained by using the F-expansion method, which can be thought of as a generalization of the Jacobi elliptic function method. In the limit case, solitary wave solutions are obtained as well.
基金Supported by the National Natural Science Foundation of China under Grant No 11265013.
文摘The nucleon-nucleon cross sections in the dense nuclear matter are microscopically calculated by using Dirac- Brueckner-Hartree-Fock （DBHF） approximation with different covariant representations of the T-matrix, i.e., complete pseudo-vector （CPV）, pseudoscalar （PS） and pseudo-vector （PV） choices. Special attention is paid to the discrepancies among the cross sections calculated with these different T-matrix project choices. The results show that the medium suppression of the cross section given by DBHF in the CPV choice is not only smaller than those obtained in both PS and PV choices, but also smaller than the predictions with a nonrelativistic Brueckner-Hartree-Fock （BHF） method including three body force （3BF）. The further analysis reveals that the influence of the different choices on the cross section in the DBHF approximation is mainly determined by the state of smaller total angular momentum due to the medium effect being strongly suppressed in the higher angular momentum.
