2003/01/08 by Ignazio Ciufolini, Ciufolini, Ignazio, Franco Ricci +1
Physics and Astronomy · #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #History and Developments in Astronomy #Pulsars and Gravitational Waves Research #Stellar, planetary, and galactic studies #gr-qc
paper · pdf · doi:10.48550/arxiv.gr-qc/0301030
Submitted to Physical Review Letters: 8 April 2002. Resubmitted, revised: 31 July 2002; 31 December 2002
arxiv created 2003/01/08 · openalex publication_date 2003/01/08 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We derive the delay in travel time of photons due to the spin of a body both inside a rotating shell and outside a rotating body. We then show that this time delay by the spin of an astrophysical object might be detected in different images of the same source by gravitational lensing; it might be relevant in the determination of the Hubble constant using accurate measurements of the time delay between the images of some gravitational lens systems. The measurement of the spin-time-delay might also provide a further observable to estimate the dark matter content in galaxies, clusters, or super-clusters of galaxies.