RT Journal Article T1 The light speed and the interplay of the quantum vacuum, the gravitation of all the universe and the fourth Heisenberg relation A1 Fernández-Rañada, Antonio AB A recently proposed model which accounts for the observed time dependence of the fine structure constant is summarized. The model is based on the combined effect of the fourth Heisenberg relation and the gravitation of all the expanding universe on the quantum vacuum. As is shown here, it predicts that the light must have now an acceleration close to H(0)c similar or equal to 6.9 x 10(-10) m/s(2). This suggests an explanation of the anomalous acceleration a(P) similar or equal to 8.5 x 10(-10) m/s(2) found in the Pioneer 10 spacecraft, because an acceleration of light has the same radio observational signature as an acceleration of the ship. PB World Scientific Publ. Co PTE LTD SN 0218-2718 YR 2003 FD 2003-10 LK https://hdl.handle.net/20.500.14352/51005 UL https://hdl.handle.net/20.500.14352/51005 NO © World Scientific Publishing Company. DS Docta Complutense RD 23 abr 2025