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Imprints of relic gravitational waves on pulsar timing
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作者 Ming-Lei Tong Yong-Heng Ding +4 位作者 Cheng-Shi Zhao Feng Gao Bao-Rong Yan Ting-Gao Yang Yu-Ping Gao 《天文和天体物理学研究:英文版》 SCIE CAS CSCD 2016年第3期111-120,共10页
Relic gravitational waves(RGWs), a background originating during inflation, would leave imprints on pulsar timing residuals. This makes RGWs an important source for detection of RGWs using the method of pulsar timing.... Relic gravitational waves(RGWs), a background originating during inflation, would leave imprints on pulsar timing residuals. This makes RGWs an important source for detection of RGWs using the method of pulsar timing. In this paper, we discuss the effects of RGWs on single pulsar timing, and quantitatively analyze the timing residuals caused by RGWs with different model parameters. In principle, if the RGWs are strong enough today, they can be detected by timing a single millisecond pulsar with high precision after the intrinsic red noises in pulsar timing residuals are understood, even though simultaneously observing multiple millisecond pulsars is a more powerful technique for extracting gravitational wave signals. We correct the normalization of RGWs using observations of the cosmic microwave background(CMB), which leads to the amplitudes of RGWs being reduced by two orders of magnitude or so compared to our previous works. We obtained new constraints on RGWs using recent observations from the Parkes Pulsar Timing Array, employing the tensor-to-scalar ratio r = 0.2 due to the tensor-type polarization observations of CMB by BICEP2 as a reference value, even though its reliability has been brought into question. Moreover, the constraints on RGWs from CMB and Big Bang nucleosynthesis will also be discussed for comparison. 展开更多
关键词 脉冲星计时 引力波 印记 遗迹 宇宙微波背景辐射 毫秒脉冲星 时序残差 通货膨胀
Pulsar timing residuals due to individual non-evolving gravitational wave sources 被引量:1
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作者 Ming-Lei Tong 《天文和天体物理学研究:英文版》 SCIE CAS CSCD 2014年第4期390-400,共11页
The pulsar timing residuals induced by gravitational waves from nonevolving single binary sources are affected by many parameters related to the relative positions of the pulsar and the gravitational wave sources. We ... The pulsar timing residuals induced by gravitational waves from nonevolving single binary sources are affected by many parameters related to the relative positions of the pulsar and the gravitational wave sources. We will analyze the various effects due to different parameters. The standard deviations of the timing residuals will be calculated with a variable parameter fixing a set of other parameters. The orbits of the binary sources will be generally assumed to be elliptical. The influences of different eccentricities on the pulsar timing residuals will also be studied in detail.We find that the effects of the related parameters are quite different, and some of them display certain regularities. 展开更多
关键词 脉冲星计时 时序残差 引力波源 演变 脉冲发生器 相对位置 可变参数 标准偏差
Detecting Very-High-Frequency Relic Gravitational Waves by a Waveguide 预览
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作者 Ming-Lei Tong Yang Zhang 《中国天文和天体物理学报:英文版》 CSCD 2008年第3期 314-328,共15页
一个电磁波(EW ) 的极化向量(PV ) 将在空间时间的一个区域经历旋转由重力的波浪(GW ) 使不安。基于这考虑,巡航的组造了环形的波导检测 GW。我们给事件 GW 从各种各样的方向并且处于各种各样的极化状态引起的 EW 的极化向量的旋转的... 一个电磁波(EW ) 的极化向量(PV ) 将在空间时间的一个区域经历旋转由重力的波浪(GW ) 使不安。基于这考虑,巡航的组造了环形的波导检测 GW。我们给事件 GW 从各种各样的方向并且处于各种各样的极化状态引起的 EW 的极化向量的旋转的详细计算,然后当 EW 沿着环形的波导传递 ncycles 时,在极化向量上分析积聚的效果。我们再考这个方法到的可行性和限制在 100 MHz 附近检测高频率的 GW,特别地遗物重力的波浪(RGW ) 。由在加速的宇宙把 RGW 的光谱与当前的波导的察觉者敏感作比较, RGW 的振幅太低,不能被当前操作的波导察觉者检测,这被发现。察觉上的改进的可能的方法被建议。 展开更多
关键词 天文学 宇宙学 重力波 偏振现象
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新型芳炔基硅树脂及其复合材料的制备 预览 被引量:4
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作者 石松 杨明 +2 位作者 孔磊 赵彤 张大海 《宇航材料工艺》 CAS CSCD 北大核心 2011年第1期 38-41,共4页
利用三乙炔基苯基苯(TEPHB)对聚硅乙炔(PSA)进行改性,成功制备了一种新型芳炔基含硅杂化树脂(PSA-E),并使用该树脂基体制备了玻璃纤维增强复合材料。表征结果指出PSA-E树脂兼具良好的工艺性能与优异的耐高温性能,该树脂的固化过... 利用三乙炔基苯基苯(TEPHB)对聚硅乙炔(PSA)进行改性,成功制备了一种新型芳炔基含硅杂化树脂(PSA-E),并使用该树脂基体制备了玻璃纤维增强复合材料。表征结果指出PSA-E树脂兼具良好的工艺性能与优异的耐高温性能,该树脂的固化过程较为温和且易于控制,其固化物的Td5高于500℃,900℃残重率大于89%(氮气条件下)。玻璃纤维增强PSA-E基复合材料的力学性能较PSA基复合材料有较大幅度的提高。 展开更多
关键词 硅基 乙炔基 树脂 复合材料
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