A worldsheet description of instant folded strings

A bstract Time-like linear dilaton backgrounds admit a classical solution that describes closed folded string is created at an instant. We refer to such strings as Instant Folded Strings (IFS). study exact worldsheet CFT description of IFS involves two vertex operators which describe open modes propagate on time-like FZZT-brane, plays the role regulator IFS. take advantage this calculate most basic quantity associated with IFSs — their production rate. Some implications calculation stringy cosmology and black hole interior are briefly discussed.