Tensionless strings, vertex operator for fixed helicity states

CERN Theory Division - CH-1211 Geneva 23, Switzerland and Demokritos National Research Center - GR-15310 Athens, Greece

Received: 25 February 2005
Accepted: 13 June 2005

Abstract

The tensionless string theory with perimeter action has pure massless spectrum of higher-spin gauge fields. The multiplicity of these massless states grows linearly. It is therefore much less compared with the standard string theory and is larger compared with the field theory models of the Yang-Mills type. It is important to define the nontrivial interaction among the infinite amount of massless particles of the perimeter string theory. The appropriate vertex operators were defined recently and I study the lowest-order vertex operators and the corresponding scattering amplitudes in tree approximation. I emphasize the special importance of the vertex operator for fixed helicity states.