For 10 points, name this hypothetical particle with spin two, the carrier of the weakest of the four fundamental forces, gravity.
One success of string theory, in which these are closed strings able to move between branes, is the fact that it resolves infinities that arise when combining these with the Standard Model at high energies.  With current technology, these cannot be directly observed, though the LIGO and VIRGO experiments are presently trying to observe their associated waves.  For 10 points, name this hypothetical particle with spin two, the carrier of the weakest of the four fundamental forces, gravity.
One success of string theory, in which these are closed strings able to move between branes, is the fact that it resolves infinities that arise when combining these with the Standard Model at high energies.  
{graviton} [prompt on "{gravity wave}" before "{wave}"]