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arXiv 2302.14846gr-qcastro-ph.GA
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修正牛顿动力学的时计场理论

Khronometric theories of modified Newtonian dynamics

Eanna E. Flanagan

AI总结:

本文证明Blanchet和Marsat提出的含时计场的相对论性MOND理论具有一致的慢运动极限,其稳态解在低加速度区域对时计场扰动稳定,但非稳态系统中时计场会引入量级为1的修正。

摘要:

2011年,Blanchet和Marsat提出了Milgrom修正牛顿动力学(MOND)的一个完全相对论版本,其中动力学自由度由时空度规和时空的一个叶状结构——时计场(khronon field)组成。该理论比其他相对论性表述更简单。我们证明该理论具有一致的非相对论或慢运动极限。Blanchet和Marsat证明,在慢运动极限下,该理论重现修正牛顿动力学的稳态解。我们证明,在低加速度区域,对于球对称、柱对称和平面对称情形,这些解对时计场扰动是稳定的。对于低加速度区域中的非稳态系统,我们证明时计场通常会对修正牛顿动力学产生量级为1的修正。

英文摘要:

In 2011 Blanchet and Marsat suggested a fully relativistic version of Milgrom's modified Newtonian dynamics (MOND) in which the dynamical degrees of freedom consist of the spacetime metric and a foliation of spacetime, the khronon field. This theory is simpler than the alternative relativsitic formulations. We show that the theory has a consistent non-relativistic or slow motion limit. Blanchet and Marsat showed that in the slow motion limit the theory reproduces stationary solutions of modified Newtonian dynamics. We show that these solutions are stable to khronon perturbations in the low acceleration regime, for the cases of spherical, cylindrical and planar symmetry. For non-stationary systems in the low acceleration regime we show that the khronon field generally gives an order unity correction to the modified Newtonian dynamics.

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