The precession of orbital plane and the significant variabilities of binary pulsars
نویسنده
چکیده
There are two kinds of expressions on the precession of orbital plane of a binary pulsar system. This paper analyzes that one expression is inconsistent with the conservation of the total angular momentum vector; whereas the other one is consistent with it. And the reason is that the former is obtained in the case of 12 degree of freedom to a binary pulsar system is; whereas the other one corresponds to 9 degree of freedom. Calculating the spin-orbit coupling induced effects of a binary pulsar system under 9 degree of freedom, significant variabilities to binary parameters can be obtained, which can interpret the observations of three typical binary pulsars, PSR J2051-0827, PSR J1012+5307, and PSR J1713+0747. The situation is similar to the calculation of the motion of a small mass at the bottom of a clock pendulum. If we assume that the degree of freedom of this small mass is 2, then this small mass can move every in the 2-dimension space, and the length of the pendulum is not a constant. On the other hand once the length of the pendulum is a constant, the degree of freedom is 1 instead of 2. And calculating under 2 or 1 degree of freedom corresponds to different predictions on the motion of a small mass at the bottom of a clock pendulum. Subject headings: pulsars: binary pulsars, geodetic precession
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