HORAVA-LIFSHITZ GRAVITY: TIGHTER CONSTRAINTS FOR THE KEHAGIAS-SFETSOS SOLUTION FROM NEW SOLAR SYSTEM DATA

作者：Iorio L^*; Ruggiero M L

来源：International Journal of Modern Physics D, 2011, 20(6): 1079-1093.

DOI：10.1142/S0218271811019281

• Experimental tests of gravitational theories
• modified theories of gravity
• celestial mechanics
• ephemerides, almanacs and calendars
• orbit determination and improvement

We analytically work out the perturbation Delta(rho) induced by the Kehagias-Sfetsos (KS) spacetime solution of the Horava-Lifshitz (HL) modified gravity at long distances on the two-body range rho for a pair of test particles A and B orbiting the same mass M. We apply our results to the most recently obtained range residuals delta(rho) for some planets of the solar system (Mercury, Mars, Saturn) ranged from the Earth to effectively constrain the dimensionless KS parameter phi(0) for the Sun. We obtain phi(circle dot)(0) >= 7.2 x 10(-10) (Mercury), phi(circle dot)(0) >= 9 x 10(-12) (Mars), and phi(circle dot)(0) >= 1.7 x 10(-12) (Saturn). Such lower bounds are tighter than others existing in the literature by several orders of magnitude. We also preliminarily obtain phi(center dot)(0) >= 8 x 10(-10) for the system constituted by the S2 star orbiting the supermassive black hole (SBH) in the center of the galaxy.

• 出版日期2011-6