Abstract
The tensionless string theory with perimeter action has puremassless spectrum of higher-spin gauge fields. The multiplicityof these massless states grows linearly. It is therefore much lesscompared with the standard string theory and is larger comparedwith the field theory models of the Yang-Mills type. It isimportant to define the nontrivial interaction among theinfinite amount of massless particles of the perimeter stringtheory. The appropriate vertex operators were defined recentlyand I study the lowest-order vertex operators and thecorresponding scattering amplitudes in tree approximation. Iemphasize the special importance of the vertex operator for fixedhelicity states.
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