On string fields and superstring field theories

Understand

We offer some thoughts regarding the space of string fields.

• We suggest that this space should be identified as the odd component of a star-algebra and focus among other issues on the role of the mid-point.
• We argue that theories with mid-point insertions in the action, such as the modified cubic theory can be well behaved, even if this mid-point insertion has a non-trivial kernel.
• We then discuss the recent proposal by Berkovits and Siegel of a non-minimal superstring field theory.