Axion mass limits may be improved by pulsar x-ray measurements.
Axion mass limits may be improved by pulsar x-ray measurements.
复制标题
轴子质量限制可以通过脉冲星 X 射线测量来改善。
DOI：
10.1103/physrevd.34.843
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Morris
中科院分区：
文献类型：
--
作者：
Morris
中子星热发射的轴子会在恒星周围的强磁场中转换成x射线。船帆座脉冲星（PSR 0833-45）的脉冲x射线目前的观测极限还不足以限制轴子质量。x射线灵敏度增加10/sup 4/倍将限制轴子质量m -斜体/下斜体/<3 × 10/sup -3/ eV，如果核心是非超流体，在温度下t -斜体/下c-斜体/- 2 × 10/sup 8/ k，这将提高极限m -斜体/下a-斜体/约。<4 x 10/sup -2/ eV来自中子星冷却，m斜体/亚斜体/<1 x 10/sup -2/ eV来自红巨星演化。如果堆芯自始至终都是超流体，则需要10/sup /的灵敏度系数。建议寻找来自PSR 1509-58或其他年轻脉冲星的调制硬x射线。在银河系内一个非常年轻的热脉冲星（t -斜体/sub - c-斜体/ -7 x 10/sup 8/ K）发出的脉冲硬x射线<5 × 10/sup -7/光子/cm/sup 2/秒的限制，可以为轴子质量设定一个确定的界限，因为中子超流动性在这个温度以上是不可能的。
Axions thermally emitted by a neutron star would be converted into x rays in the strong magnetic field surrounding the star. The present observational limit of pulsed x rays from the Vela pulsar (PSR 0833-45) is not small enough to bound the axion mass. An increase in x-ray sensitivity by a factor of 10/sup 4/ would constrain the axion mass M-italic/sub a-italic/<3 x 10/sup -3/ eV if the core is nonsuperfluid and at temperature T-italic/sub c-italic/--2 x 10/sup 8/ K. This would improve the limits M-italic/sub a-italic/approx. <4 x 10/sup -2/ eV from neutron-star cooling and M-italic/sub a-italic/<1 x 10/sup -2/ eV from red-giant evolution. If the core is superfluid throughout, a factor of 10/sup 5/ in sensitivity would be needed. A search for modulated hard x rays from PSR 1509-58 or other young pulsars is suggested. A limit on pulsed hard x rays <5 x 10/sup -7/ photons/cm/sup 2/ sec from a very young hot (T-italic/sub c-italic/--7 x 10/sup 8/ K) pulsar within the Galaxy could set a firm bound on the axion mass, since neutron superfluidity is not expected above this temperature.