Elizaga Navascués, BeatrizMartín Benito, MercedesMena Marugán, Guillermo Antonio2024-11-142024-02-052024-11-1420160218-2718https://hdl.handle.net/20.500.14352/98765.2Está depositado el preprint del artículoIn the framework of Loop Quantum Cosmology (LQC), inhomogeneous models are usually quantized by means of a hybrid approach that combines loop quantization techniques with standard quantum field theory methods. This approach is based on a splitting of the phase space in a homogeneous sector, formed by global, zero-modes and an inhomogeneous sector, formed by the remaining, infinite number of modes, that describe the local degrees of freedom. Then, the hybrid quantization is attained by adopting a loop representation for the homogeneous gravitational sector, while a Fock representation is used for the inhomogeneities. The zero-mode of the Hamiltonian constraint operator couples the homogeneous and inhomogeneous sectors. The hybrid approach, therefore, is expected to provide a suitable quantum theory in regimes where the main quantum effects of the geometry are those affecting the zero-modes, while the inhomogeneities, still being quantum, can be treated in a more conventional way. This hybrid strategy was first proposed for the simplest cosmological midisuperspaces: the Gowdy models, and it has been later applied to the case of cosmological perturbations. This paper reviews the construction and main applications of hybrid LQC.engjournal articlehttp://doi.org/10.1142/S0218271816420074http://hdl.handle.net/10261/151467open access530.145Hybrid loop quantum cosmologyInhomogeneous cosmologiesTeoría de los quanta2212 Física Teórica