RT Journal Article
T1 Loop quantization of vacuum Bianchi I cosmology
A1 Martín Benito, Mercedes
A1 Mena Marugán, Guillermo Antonio
A1 Pawlowski, Tomasz
AB We analyze the loop quantization of the family of vacuum Bianchi I spacetimes, a gravitational system of which classical solutions describe homogeneous anisotropic cosmologies. We rigorously construct the operator that represents the Hamiltonian constraint, showing that the states of zero volume completely decouple from the rest of quantum states. This fact ensures that the classical cosmological singularity is resolved in the quantum theory. In addition, this allows us to adopt an equivalent quantum description in terms of a well-defined densitized Hamiltonian constraint. This latter constraint can be regarded in a certain sense as a difference evolution equation in an internal time provided by one of the triad components, which is polymerically quantized. Generically, this evolution equation is a relation between the projection of the quantum states in three different sections of constant internal time. Nevertheless, around the initial singularity the equation involves only the two closest sections with the same orientation of the triad. This has a double effect: on the one hand, physical states are determined just by the data on one section, on the other hand, the evolution defined in this way never crosses the singularity, without the need of any special boundary condition. Finally, we determine the inner product and the physical Hilbert space employing group averaging techniques, and we specify a complete algebra of Dirac observables. This completes the quantization program.
PB American Physical Society
SN 2470-0010
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/99387
UL https://hdl.handle.net/20.500.14352/99387
LA eng
NO Martín-Benito, M., et al. «Loop Quantization of Vacuum Bianchi I Cosmology». Physical Review D, vol. 78, n.o 6, septiembre de 2008, p. 064008. DOI.org (Crossref), https://doi.org/10.1103/PhysRevD.78.064008.
NO Ministerio de Ciencia e Innovación (España)
NO Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España)
NO Consejo Superior de Investigaciones Científicas (España)
NO European Social Fund
DS Docta Complutense
RD 9 abr 2025