标题： 关于民主弦场理论 显示英文标题

标题： On Democratic String Field Theories

摘要： 我们重新考察了民主开弦场理论，即那些弦场不受限于单一图片数并且图片改变作为规范变换获得的理论。 我们描述了几种可能的正则自由理论，并尝试构造这些理论中最低阶的相互作用项并识别最低阶的规范变换。 我们还讨论了对于一致的图片改变的非物理实现可能需要的弦场空间投影。 显示英文摘要

摘要： We reexamine democratic open string field theories, namely, theories in which string fields are not constrained to a single picture number and picture changing is obtained as a gauge transformation. We describe several possibilities for regular free theories and attempt to construct the lowest order interaction term and identify the lowest order gauge transformation for some of these theories. We also discuss projections over string field spaces that might be needed for a consistent off-shell implementation of picture changing.