The discussion centers on the relationship between brane world scenarios and non-compact extra dimensions in theoretical physics. It establishes that a 3-brane exists within a 10-dimensional bulk, which can be non-compact if the brane is in motion. The necessity for a finite size of the bulk to achieve macroscopic gravity is emphasized. Various models, including those proposed by Randall and Sundrum, explore both finite and infinite extra dimensions, with some papers suggesting dimensions beyond the commonly referenced 10 or 11.
PREREQUISITESThe discussion is beneficial for theoretical physicists, cosmologists, and students interested in advanced concepts of higher-dimensional theories and their implications for gravity and spacetime structure.
cristo said:If you've got a braneworld scenario where the 3D brane is moving through the bulk then yes, the bulk is non-compact.
arivero said:I was thinking so. On other hand, in order to have macroscopic gravity I imagine they need some finite "size" of the bulk.