Some comments on a recently proposed test of the Brane - World scenario with the LARES / WEBER - SAT satellite

Recently Ciufolini has suggested to use the perigee of the proposed LARES/WEBER-SAT satellite in order to measure the secular precession which would be induced on such Keplerian orbital element by a weak-field modification of gravity occurring in some Brane-World scenarios put forth by Dvali. This precession would amount to 0.04 milliarcseconds per year for LARES. In this paper we show that, according to the recently released EIGEN-CG01C Earth gravity model which combines data from the dedicated CHAMP and GRACE missions, the quite larger systematic errors due to the Newtonian part of the terrestrial gravitational potential would vanish any attempts to detect a so small effect. Improvements in our knowledge of the Earth’s gravitational field of three orders of magnitude would be required.