First-Order Equations of Motion for Heterotic String Field Theory

Understand

We consider the equations of motion of the full heterotic string field theory including both the Neveu-Schwarz and the Ramond sectors.

• It is shown that they can be formulated in the form of an infinite number of first-order equations for an infinite number of independent string fields.
• We prove that the conventional equations of motion are obtaned by solving the extra equations for the extra string fields with a certain assumptions at the linearized level.
• The conventional gauge transformations are also obtained from those in this first-order formulation, which is clarified by deriving some lower oder transformations explicitly.