TY - JOUR AU - Fernández-Rañada, Antonio PY - 2008 DO - 10.1007/s10701-008-9214-4 SN - 0015-9018 UR - https://hdl.handle.net/20.500.14352/50998 T2 - Foundations of Physics AB - In the context of a parametric theory (with the time being a dynamical variable) we consider here the coupling between the quantum vacuum and the background gravitation that pervades the universe (unavoidable because of the universality and long range... LA - eng M2 - 458 PB - Springer KW - Quantum Vacuum KW - Gravitation KW - Acceleration. TI - Time, clocks and parametric invariance TY - journal article VL - 38 ER -