摘要
We examine the theory of generation order parameters.Three kinds of generation order parameters are introduced,which describe the production of high-energyγphotons in a cascade process scenario.We find a correlation between the average power−law photon indexΓand spin−down rate.P in 38 common FERMIγ−ray pulsars,and find that the third generation order parameter,which implies that the magnetic field may have the most significant effect on the high-energyγphoton absorption in the cascade processes,is the best one.The statistical work shows that the theory of generation order parameters can be applied to describe the theγ-ray pulsar radiation mechanisms in the cascade processes.
基金
by the National Natural Science Foundation of China under Grant Nos 10975046 and 10773017
the National Basic Research Program of China(2009CB824800).
