2006/02/08 by Shinsuke Kawai, Esko Keski-Vakkuri, Robert G. Leigh +1
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Boundary (topology) #Boundary conformal field theory #Computer science #Conformal field theory #Conformal map #Conformal symmetry #Context (archaeology) #Cosmology and Gravitation Theories #Field (mathematics) #Geometry #Mathematical analysis #Mathematical physics #Mathematics #Neumann boundary condition #Non-critical string theory #Noncommutative and Quantum Gravity Theories #Orbifold #Physics #Pure mathematics #Reflection (computer programming) #String (physics) #String field theory #String theory #Tachyon #Theoretical physics #cond-mat.other #hep-th
paper · pdf · doi:10.1103/physrevd.73.106003
published as Phys.Rev.D73:106003,2006 · 23 pages
arxiv created 2006/02/08 · openalex publication_date 2006/05/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the nontrivial boundary conformal field theory with exactly marginal boundary deformation. In recent years this deformation has been studied in the context of rolling tachyons and S-branes in string theory. Here we study the problem directly from an open string point of view, at one loop. We formulate the theory of the ℤ2 reflection orbifold. To do so, we extend fermionization techniques originally introduced by Polchinski and Thorlacius. We also explain how to perform the open string computations at arbitrary (rational) radius, by consistently constructing the corresponding shift orbifold, and show in what sense these are related to known boundary states. In a companion paper, we use these results in a cosmological context involving decaying branes.