Ghost D-branes
نویسندگان
چکیده
We define a ghost D-brane in superstring theories as an object that cancels the effects of an ordinary D-brane. The supergroups U(N |M) and OSp(N |M) arise as gauge symmetries in the supersymmetric world-volume theory of D-branes and ghost D-branes. A system with a pair of D-brane and ghost D-brane located at the same location is physically equivalent to the closed string vacuum. When they are separated, the system becomes a new brane configuration. We generalize the type I/heterotic duality by including n ghost D9-branes on the type I side and by considering the heterotic string whose gauge group is OSp(32+2n|2n). Motivated by the type IIB S-duality applied to D9and ghost D9-branes, we also find type II-like closed superstrings with U(n|n) gauge symmetry.
منابع مشابه
Hairpin Branes and D-Branes Behind the Horizon
We study Lorentzian D-particles in linear dilaton and the two dimensional black hole backgrounds. The D-particle trajectory follows an accelerated trajectory which is smeared by stringy corrections. For the black hole background we find that the portion of the trajectory behind the horizon appears to an asymptotic observer as ghost D-particle. This suggests a way of constructing a matrix model ...
متن کاملD-brane States and Disk Amplitudes in OSp Invariant Closed String Field Theory
We construct solitonic states in the OSp invariant string field theory, which are BRST invariant in the leading order of regularization parameter ǫ. We calculate the disk amplitudes using these solitonic states and show that they describe D-branes and ghost D-branes. e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]
متن کاملGhost Tachyon Condensation, Brane-like States and Extra Time Dimension
NSR superstring theory contains a tower of physical vertex operators (brane-like states) which exist at non-zero pictures only, i.e. are essentially mixed with superconformal ghosts. Some of these states are massless, they are responsible for creating D-branes. Other states are tachyonic (called ghost tachyons) creating a problem for the vacuum stability of the NSR model. In this paper we explo...
متن کاملD-Branes and Physical States
States obtained by projecting boundary states, associated with D-branes, to fixed mass-level and momentum generically define non-trivial cohomology classes. For on-shell states the cohomology is the standard one, but when the states are off-shell the relevant cohomology is defined using a BRST operator with ghost zero modes removed. The zero momentum cohomology falls naturally into multiplets o...
متن کاملGhost Image Mapping of Palatal Bone of Maxilla and Nasal Cavity in Panoramic View Using Cranex D Digital Machine
Introdouction: The mapping of ghost images of the maxilla and the nasal cavity, which are complex structures, is very important. The position of objects that create a ghost image can differ when using various devices. The purpose of this investigation was to study the mapping of ghost images of the maxilla and the nasal cavity using a Cranex D digital panoramic machine. Materials and methods: ...
متن کامل