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Universality of free fall from the orbital motion of a pulsar in a stellar triple system

机译：恒星三重系统中脉冲星轨道运动引起的自由落体的普遍性

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Einstein's theory of gravity-the general theory of relativity(1)-is based on the universality of free fall, which specifies that all objects accelerate identically in an external gravitational field. In contrast to almost all alternative theories of gravity(2), the strong equivalence principle of general relativity requires universality of free fall to apply even to bodies with strong self-gravity. Direct tests of this principle using Solar System bodies(3,4) are limited by the weak self-gravity of the bodies, and tests using pulsar-white-dwarf binaries(5,6) have been limited by the weak gravitational pull of the Milky Way. PSR J0337 + 1715 is a hierarchical system of three stars (a stellar triple system) in which a binary consisting of a millisecond radio pulsar and a white dwarf in a 1.6-day orbit is itself in a 327-day orbit with another white dwarf. This system permits a test that compares how the gravitational pull of the outer white dwarf affects the pulsar, which has strong self-gravity, and the inner white dwarf. Here we report that the accelerations of the pulsar and its nearby white-dwarf companion differ fractionally by no more than 2.6 x 10(-6). For a rough comparison, our limit on the strong-field Nordtvedt parameter, which measures violation of the universality of free fall, is a factor of ten smaller than that obtained from (weak-field) Solar System tests(3,4) and a factor of almost a thousand smaller than that obtained from other strong-field tests(5,6).
机译：爱因斯坦的引力理论-相对论的一般理论（1）-基于自由落体的普遍性，它规定了所有物体在外部引力场中的加速度相同。与几乎所有其他引力理论（2）相比，广义相对论的强等价原理要求自由落体的普遍性甚至适用于具有强自重的物体。使用太阳系天体（3,4）对该原理的直接测试受到天体弱自重的限制，而使用脉冲星-白矮星二元（5,6）的测试受到天体弱重力的限制。银河。 PSR J0337 + 1715是由三颗星组成的分层系统（恒星三重系统），其中在1.6天的轨道中由毫秒无线电脉冲星和白矮星组成的双星本身在327天的轨道中自身与另一颗白矮星一起。该系统可以进行测试，比较外部白矮星的引力对脉冲星和内部白矮星的影响，脉冲星具有很强的自重力。在这里我们报告说，脉冲星及其附近白矮星伴星的加速度相差不超过2.6 x 10（-6）。作为粗略的比较，我们对强磁场Nordtvedt参数的限制（衡量违反自由落体的普遍性）比从（弱场）太阳系测试（3,4）和比其他强场测试获得的系数小近一千倍（5,6）。

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  • 来源
    《Nature》 |2018年第7712期|73-76|共4页
  • 作者

    Archibald Anne M.; Gusinskaia Nina V.; Hessels Jason W. T.; Deller Adam T.; Kaplan David L.; Lorimer Duncan R.; Lynch Ryan S.; Ransom Scott M.; Stairs Ingrid H.;

  • 作者单位

    Univ Amsterdam, Anton Pannekoek Inst Astron, Amsterdam, Netherlands;

    Univ Amsterdam, Anton Pannekoek Inst Astron, Amsterdam, Netherlands;

    Univ Amsterdam, Anton Pannekoek Inst Astron, Amsterdam, Netherlands;

    Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic, Australia;

    Univ Wisconsin, Dept Phys, Milwaukee, WI USA;

    West Virginia Univ, Dept Phys & Astron, Morgantown, WV USA;

    Ctr Gravitat Waves & Cosmol, Morgantown, WV USA;

    Natl Radio Astron Observ, Charlottesville, VA USA;

    Univ British Columbia, Dept Phys & Astron, Vancouver, BC, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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