RT Journal Article T1 An introduction to the dark energy problem A1 Dobado González, Antonio A1 López Maroto, Antonio AB In this work we review briefly the origin and history of the cosmological constant and its recent reincarnation in the form of the dark energy component of the universe. We also comment on the fundamental problems associated to its existence and magnitude which require an urgent solution for the sake of the internal consistency of theoretical physics. PB Springer SN 0004-640X YR 2009 FD 2009-04 LK https://hdl.handle.net/20.500.14352/43813 UL https://hdl.handle.net/20.500.14352/43813 LA eng NO © Springer. Conference on Network for Ultra Violet Astronomy (2007. Madrid, España). This work has been partially supported by theDGICYT (Spain) under the project numbers FPA 2004-02602 and FPA2005-02327 and by the Universidad Complutense/CAM: project number 910309. A.D. thanks Ana I. Gómez de Castro for her kind invitationto participate in the NUVA Conference NO DGICYT (Spain) NO Universidad Complutense/CAM DS Docta Complutense RD 11 abr 2025