ARE THE STRING AND EINSTEIN FRAMES EQUIVALENT?

ENRIQUE ÁLVAREZ, JORGE CONDE
2002 Modern Physics Letters A  
The low energy physics as predicted by strings can be expressed in two (conformally related) different variables, usually called {\em frames}. The problem is raised as to whether it is physically possible in some situations to tell one from the other.
doi:10.1142/s0217732302006606 fatcat:iazhk7ndhrc43adqad3eluu6sa