On Decoupling of Massless Modes in NCOS Theories

TL;DR

This paper investigates the decoupling of massless modes in noncommutative open string theories, confirming the phenomenon through explicit calculations and all-order perturbative analysis.

Contribution

It provides a detailed verification of massless mode decoupling in NCOS theories across various dimensions, extending previous understanding.

Findings

Decoupling holds in (2+1) and higher dimensions.

Explicit computations confirm decoupling.

Decoupling is valid to all orders in perturbation theory.

Abstract

We revisit the decoupling phenomenon of massless modes in the noncommutative open string (NCOS) theories. We check the decoupling by explicit computation in (2+1) or higher dimensional NCOS theories and recapitulate the validity of the decoupling to all orders in perturbation theory.