Europhys. Lett.
Volume 71, Number 4, August 2005
Page(s) 549 - 555
Section The physics of elementary particles and fields
Published online 13 July 2005
Europhys. Lett., 71 (4), pp. 549-555 (2005)
DOI: 10.1209/epl/i2005-10114-3

Tensionless strings, vertex operator for fixed helicity states

G. Savvidy

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
published online 13 July 2005

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.

11.25.-w - Strings and branes.
11.25.Hf - Conformal field theory, algebraic structures.
11.25.Db - Properties of perturbation theory.

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