Further Evidence for Cosmological Evolution of the Fine Structure Constant

Abstract

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 datasets and two 21cm/mm absorption systems provide four independent samples, spanning 23% to 87% of the age of the universe. Each sample yields a smaller alpha in the past and the optical sample shows a 4-sigma deviation: da/a = -0.72 +/- 0.18 x 10^{-5} over the redshift range 0.5 < z < 3.5. We find no systematic effects which can explain our results. The only potentially significant systematic effects push da/a towards positive values, i.e. our results would become more significant were we to correct for them.

5 pages, 1 figure. Published in Phys. Rev. Lett. Small changes to discussion, added an acknowledgement and a reference

References in corpus (1)

• Relativistic effects in Ni II and the search for variation of the fine structure constant

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• Spacetime variation of $\alpha$ and the CMB power spectra after the recombination
• The fine structure constant: a review of measurement results and possible space-time variations
• Cosmological Consequences of Topological Defects: Dark Energy and Varying Fundamental Constants
• Extended Planck Scale
• Review of detector requirements: some challenges for the present
• Dilaton Stabilization and Inflation in the D-brane World
• The variation of G in a negatively curved space-time
• A Mathematica Program Using Isotropic Harmonic Oscillator Eigenstates to Model Alpha-Particle Tunneling Half Life Variability
• Nuclear Physics from QCD
• Naturally Time Dependent Cosmological Constant
• Measured redshift invariance of photon velocity
• On the Nature of the Relativity Principle
• The New Planck Scale: Quantized Spin and Charge Coupled to Gravity
• Constraining runaway dilaton models using joint gravitational-wave and electromagnetic observations
• A Time Variation of the QCD Coupling Constant
• A homogeneous and isotropic universe must have a time varying light speed
• Invariance of the fine structure constant with temperature of the expanding universe
• Sensitivity Parameter and Time Variations of Fundamental Constants
• Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant
• Cosmological solutions of Tensor-Vector theories of gravity with varying the space-time-matter coupling constant
• Analysing the Effect on CMB in a Parity and Charge Parity Violating Varying Alpha Theory
• A Mathematica Notebook for Alpha Decay Using an Exponentially Diffuse Boundary Potential
• The Relation Between Fundamental Constants and Particle Physics Parameters
• Does the QCD Scale vary in time?
• Extra Dimensions, Dual Relation and the Cosmological Constant
• On Generalized Theories of Varying Fine Structure Constant
• Avoiding unrealistic priors: the case of dark energy constraints from the time variation of the fine-structure constant
• 133Cs87Rb Laser Cooled Dual Fountain
• Dark Energy and the Time Dependence of Fundamental Particle Constants