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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/42997
- Time evolution of the fine structure constant
- Murphy, Michael T.; Webb, J. K.; Flambaum, Victor V.; Curran, Stephen J.
- We present a short review of the current quasar (QSO) absorption line constraints on possible variation of the fine structure constant, α ≡ e2/¯hc. Particular attention is paid to recent optical Keck/HIRES spectra of 49 absorption systems which indicate a smaller α in the past [1, 2]. Here we present new preliminary results from 128 absorption systems: Δα/α = (−0.57±0.10)×10−5 over the redshift range 0.2 < z < 3.7, in agreement with the previous results. Known potential systematic errors cannot explain these results. We compare them with strong ‘local’ constraints and discuss other (radio and millimeter-wave) QSO absorption line constraints on variations in α2gp and α2gpme/mp (gp is the proton g-factor and me/mp is the electron/proton mass ratio). Finally, we discuss future efforts to rule out or confirm the current 5.7 σ optical detection.
- Publication type
- Conference paper
- Proceedings of the 22nd Physics in Collision Conference (PIC 2002), Stanford, California, United States, 20-22 June 2002, pp. 116-127
- Publication year
- Astrophysics; High energy physics; Phenomenology; Quantum cosmology; Relativity
- Stanford University
- Publisher URL
- Peer reviewed