Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-06
Phys.Rev.Lett. 90 (2003) 141101
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures. Accepted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.90.141101
In contrast to gravity in the weak-field regime, which has been subject to numerous experimental tests, gravity in the strong-field regime is largely unconstrained by observations. We show that gravity theories that cannot be rejected by solar system tests but that diverge from general relativity in the strong-field regime predict neutron stars with significantly different properties than their general relativistic counterparts. In particular, the range of redshifts of surface atomic lines predicted by such gravity theories is significantly larger than the uncertainty introduced by our lack of knowledge of the equation of state of ultra-dense matter. Measurements of such redshifted lines with current X-ray observatories such as Chandra and XMM-Newton can thus provide interesting new constraints on strong-field gravity.
DeDeo Simon
Psaltis Dimitrios
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