Garay Elizondo, Luis Javier2023-06-202023-06-201995-01-200217-751X10.1142/S0217751X95000085https://hdl.handle.net/20.500.14352/59556© World Scientific Publ Co Pte Ltd I am very grateful to Jonathan Halliwell and Max Bañados for fruitful discussions and suggestions and for a critical reading of the manuscript. I also thank Alex Mikovi´c and Roya Mohayaee for useful conversations. The author was supported by a joint fellowship from the Ministerio de Educación y Ciencia (Spain) and the British Council.The existence of a fundamental scale, a lower bound to any output of a position measurement, seems to be a model-independent feature of quantum gravity. In fact, different approaches to this theory lead to this result. The key ingredients for the appearance of this minimum length are quantum mechanics, special relativity and general relativity. As a consequence, classical notions such as causality or distance between events cannot be expected to be applicable at this scale. They must be replaced by some other, yet unknown, structure.engjournal articlehttp://dx.doi.org/10.1142/S0217751X95000085http://www.worldscientific.com/http://www.lpthe.jussieu.fr/~talon/grquml.pdfopen access51-73Generalized uncertainty principleString theoryBlack-holeCosmological constantBaby universesWormholesSpacetimeRelativityFluctuationsLimitationsFísica-Modelos matemáticosFísica matemática