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oai:docta.ucm.es:20.500.14352/595392023-08-26T22:51:01Zcom_20.500.14352_14col_20.500.14352_15

Garay Elizondo, Luis Javier González Díaz, Pedro F. Mena Marugán, Guillermo A. Raya, José M. 2023-06-20T19:20:13Z 2023-06-20T19:20:13Z 1997-06-15 0556-2821 10.1103/PhysRevD.55.7872 https://hdl.handle.net/20.500.14352/59539 http://dx.doi.org/10.1103/PhysRevD.55.7872 http://journals.aps.org http://arxiv.org/pdf/hep-th/9608004v2.pdf The quantization of circular strings in an anti-de Sitter background spacetime is performed, obtaining a discrete spectrum for the string mass. A comparison with a four-dimensional homogeneous and isotropic spacetime coupled to a conformal scalar field shows that the string radius and the scale factor have the same classical solutions and that the quantum theories of these two models are formally equivalent. However, the physically relevant observables of these two systems have different spectra, although they are related to each other by a specific one-to-one transformation. We finally obtain a discrete spectrum for the spacetime size of both systems, which presents a nonvanishing lower bound. eng open access Circular strings, wormholes, and minimum size journal article