1997/01/10 by Mariusz P. Da̧browski, Mariusz P. Dabrowski, Claus Kiefer
Mathematics · Physics and Astronomy · #Big Bounce #Black Holes and Theoretical Physics #Boundary (topology) #Classical mechanics #Cosmology and Gravitation Theories #Loop quantum cosmology #Mathematical analysis #Mathematics #Minisuperspace #Noncommutative and Quantum Gravity Theories #Physics #Quantum #Quantum cosmology #Quantum gravity #Quantum mechanics #Relationship between string theory and quantum field theory #String (physics) #String cosmology #Theoretical physics #gr-qc #hep-th
paper · pdf · doi:10.1016/s0370-2693(97)00192-5
published as Phys.Lett. B397 (1997) 185-192 · 16 pages, REVTEX, minor changes, two references added
arxiv created 1997/01/10 · openalex publication_date 1997/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss in detail how to consistently impose boundary conditions in quantum string cosmology. Since a classical time parameter is absent in quantum gravity, such conditions must be imposed with respect to intrinsic variables. Constructing wave packets for minisuperspace models from different tree-level string effective actions, we explain in particular the meaning of a transition between ``pre-big-bang" and ``post-big-bang" branches. This leads to a scenario different from previous considerations.