Secular effects of ultralight dark matter on binary pulsars
Secular effects of ultralight dark matter on binary pulsars
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DOI：
10.1103/physrevd.101.063016
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发表时间：
2019-10
影响因子：
5
通讯作者：
D. Blas;D. L. Nacir;S. Sibiryakov
中科院分区：
文献类型：
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作者：
D. Blas;D. L. Nacir;S. Sibiryakov
暗物质（DM）可以由非常轻的玻色子组成，表现为经历相干振荡的经典标量场。这个DM场的存在会扰乱天体的动力学，要么是因为（振荡的）DM应力张量改变了星系的引力势，要么是DM直接耦合到天体的组成部分。我们研究了这种扰动引起的双星系统轨道参数的长期变化。确定了两类影响。如果DM振荡的频率与轨道运动共振，则会出现第一类效应;这些效应存在于一般DM耦合中，包括纯引力相互作用的情况。第二类的影响出现，如果DM是二次耦合的质量的二进制系统成员，并不需要任何共振条件。双星脉冲星计时的精确度可以用来限制这些影响。目前的观测对银河系引力场的振荡并不敏感，尽管在高DM密度区域发现的双星可能会改善这种情况。对于直接耦合到普通物质的DM，当前的时间数据已经与DM质量$\sim 10^{-22}-10 ^{-18}\，{\rm eV}$范围内的其他现有约束竞争。预计未来的观测将提高灵敏度，并探索新的参数区域。
Dark matter (DM) can consist of very light bosons behaving as a classical scalar field that experiences coherent oscillations. The presence of this DM field would perturb the dynamics of celestial bodies, either because the (oscillating) DM stress tensor modifies the gravitational potentials of the galaxy, or if DM is directly coupled to the constituents of the body. We study secular variations of the orbital parameters of binary systems induced by such perturbations. Two classes of effects are identified. Effects of the first class appear if the frequency of DM oscillations is in resonance with the orbital motion; these exist for general DM couplings including the case of purely gravitational interaction. Effects of the second class arise if DM is coupled quadratically to the masses of the binary system members and do not require any resonant condition. The exquisite precision of binary pulsar timing can be used to constrain these effects. Current observations are not sensitive to oscillations in the galactic gravitational field, though a discovery of pulsars in regions of high DM density may improve the situation. For DM with direct coupling to ordinary matter, the current timing data are already competitive with other existing constraints in the range of DM masses $\sim 10^{-22}-10^{-18}\,{\rm eV}$. Future observations are expected to increase the sensitivity and probe new regions of parameters.