β Scribed by M.E.V Costa; H.J de Vega
No coin nor oath required. For personal study only.
The two-point amplitude, AZ(kZ. k,), describing the scattering of the lowest string excitation (the tachyon) by a gravitational shock wave (GSW) is computed.
For this purpose, we use the appropriate vertex operator in the GSW background.
We explicitly evaluate Az(kz, k,) for large impact parameters 4. It is given by the Coulombian amplitude plus string corrections of order .s/q (s = (k, +X-?)*). for large 4. These string corrections produce an infinite sequence of imaginary poles in s, the semi-infinite sequence of Coulomb poles noticed by 't Hooft always remaining present.
:( ' 1991 Academic Press. Inc.
π SIMILAR VOLUMES
A simple scheme for a universal two-bit quantum logic gate is proposed. The scheme uses well defined atomic center-of-mass momentum states interacting with a resonant cavity field in Bragg regime. The cavity field state controls the atomic momentum state while passing through the cavity. The cavity