منابع مشابه
Can hidden correlations mimic a variable fine structure constant ?
Murphy et al. (2003a, MNRAS, 345, 609) claim to find evidence of cosmological variations of the fine structure constant α in the spectra of intervening QSO absorption line systems. We find that this result is affected by systematic effects. The α values estimated in individual line systems depend on the set of atomic transitions used and therefore the quoted dependence on the cosmic age may ref...
متن کاملA Variable Model of the Fine-Structure Constant
Recent evidence suggests that the fine-structure constant c e α h 2 = , a measure of the strength of the electromagnetic interaction between photons and electrons, is slowly increasing over cosmological timescales. High-resolution measurements of quasar spectra suggest that there has been a variation ∆α/α =-0.72 ± 0.18×10 over the past 6-10 Gyr.To model this, we propose variability in the speed...
متن کاملVariable Fine Structure Constant from Maximal-acceleration Phase Space Relativity
Recently, we presented a new physical model that links the maximum speed of light with the minimal Planck scale into a maximal-acceleration Relativity principle in the spacetime tangent bundle and in phase spaces (cotangent bundle). The maximal proper-acceleration bound is a = c/Λ in full agreement with the old predictions of Caianiello, the Finslerian geometry point of view of Brandt and more ...
متن کاملVariable Structure
of Nonholonomic Wheeled Mobile Robot Hyun-Sik Shim Jong-Hwan Kim Kwangill Koh Dept. of Elec. Eng. Dept. of Elec. Eng. KAIST KAIST LG Industrial Systems Co., Ltd. Taejoen-shi, 305-701, Korea Taejoen-shi, 305-701, Korea Kyongki-do, 430-080, Korea [email protected] [email protected] [email protected] Abstract A variable structure controller(VSC) for a nonholonomic wheeled mobile...
متن کاملFurther evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
We have previously presented evidence for a varying fine-structure constant, α, in two independent samples of Keck/HIRES QSO absorption spectra. Here we present a detailed manymultiplet analysis of a third Keck/HIRES sample containing 78 absorption systems. We also re-analyse the previous samples, providing a total of 128 absorption systems over the redshift range 0.2 < zabs < 3.7. The results,...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1999
ISSN: 0028-0836,1476-4687
DOI: 10.1038/19426