caa a22 4500 467887136 CHVBK 20180406152737.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10714-006-0348-4 doi (NATIONALLICENCE)springer-10.1007/s10714-006-0348-4 Bojowald Martin Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, 16802, University Park, PA, USA aut Loop quantum cosmology and inhomogeneities [Elektronische Daten] [Martin Bojowald] Inhomogeneities are introduced in loop quantum cosmology using regular lattice states, with a kinematical arena similar to that in homogeneous models considered earlier. The framework is intended to encapsulate crucial features of background independent quantizations in a setting accessible to explicit calculations of perturbations on a cosmological background. It is used here only for qualitative insights but can be extended with further more detailed input. One can thus see how several parameters occuring in homogeneous models appear from an inhomogeneous point of view. Their physical roles in several cases then become much clearer, often making previously unnatural choices of values look more natural by providing alternative physical roles. This also illustrates general properties of symmetry reduction at the quantum level and the roles played by inhomogeneities. Moreover, the constructions suggest a picture for gravitons and other metric modes as collective excitations in a discrete theory, and lead to the possibility of quantum gravity corrections in large universes. Springer Science+Business Media, LLC, 2006 General Relativity and Gravitation Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 38/12(2006-12-01), 1771-1795 0001-7701 38:12<1771 2006 38 10714 https://doi.org/10.1007/s10714-006-0348-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-006-0348-4 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Bojowald Martin Institute for Gravitational Physics and Geometry, The Pennsylvania State University, 104 Davey Lab, 16802, University Park, PA, USA aut NATIONALLICENCE 773 0- General Relativity and Gravitation Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 38/12(2006-12-01), 1771-1795 0001-7701 38:12<1771 2006 38 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer