Cosmological constant, fine structure constant and beyond
نویسندگان
چکیده
منابع مشابه
Varying Fine-Structure Constant and the Cosmological Constant Problem1
We start with a brief account of the latest analysis of the Oklo phenomenon providing the still most stringent constraint on time-variability of the fine-structure constant α. Comparing this with the recent result from the measurement of distant QSO’s appears to indicate a non-uniform time-dependence, which we argue to be related to another recent finding of the accelerating universe. This view...
متن کاملFurther evidence for cosmological evolution of the fine structure constant.
We describe the results of a search for time variability of the fine structure constant alpha using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm and mm absorption systems provide four independent samples, spanning approximately 23% to 87% of the age of the universe. Each sample yields a smaller alpha in the past and the optical sample shows a...
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Bekenstein’s model of a scalar field, φ, that affects the electromagnetic permeability (usually identified with “changing α”) predicts tiny variations of the effective fine structure constant up to very high red-shifts, |α(z = 3.5)/α0− 1| < 10, when the constraints from Eötvös-Dicke-Braginsky types of experiments are imposed. We generalize this model by allowing additional couplings of φ to bot...
متن کاملPossible Cosmological Implications of a Time Varying Fine Structure Constant
Webb et al. [2] experimental results on the fine strucutre “constant ” variation with the age of the Universe, is here analized. By using the experimental data on the fine-structure “constant ”’s variation with the age of the Universe, and Dirac’s LNH (Large Number Hypothesis), we find how should vary the total number of nucleons in the Universe, the speed of light, Newton’s gravitational “cons...
متن کاملDoes the fine-structure constant vary with cosmological epoch?
We use the strong nebular emission lines of O iii, 5007 Å and 4959 Å, to set a robust upper limit on the time dependence of the fine structure constant. We find |α−1dα(t)/dt| < 2 × 10−13 yr−1, corresponding to ∆α/α(0) = (0.7± 1.4) × 10−4 for quasars with 0.16 < z < 0.80 obtained from the SDSS Early Data Release. Using a blind analysis, we show that the upper limit given here is invariant with r...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2017
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-016-4581-z