Search for cosmological mu variation from high redshift H2 absorption; a status report
arXiv:1101.5150 · doi:10.1007/978-3-642-19397-2_13
Abstract
Observations of H2 spectra in the line-of-sight of distant quasars may reveal a variation of the proton-electron mass ratio mu=m_p/m_e at high redshift, typically for z>2. Currently four high-quality systems (Q0347-383, Q0405-443, Q0528-250 and J2123-005) have been analyzed returning a constraint Dmu/mu < 1 x 10^{-5}. We present data and a mu-variation analysis of another system, Q2348-011 at redshift z_{abs}=2.42, delivering dmu/mu = (-1.5 \pm 1.6) x 10^{-5}. In addition to observational data the status of the laboratory measurements is reviewed. The future possibilities of deriving a competitive constraint on Dmu/mu from the known high-redshift H2 absorbers is investigated, resulting in the identification of a number of potentially useful systems for detecting mu-variation.
13 Pages, 4 Figures, JENAM conference (Lisbon); accepted
References in corpus (15)
- Indications of a spatial variation of the fine structure constant
- Velocity-Metallicity Correlation for high-z DLA Galaxies: Evidence for a Mass-Metallicity Relation?
- Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
- Strong Limit on a Variable Proton-to-Electron Mass Ratio from Molecules in the Distant Universe
- A translucent interstellar cloud at z=2.69: CO, H2 and HD in the line-of-sight to SDSS J123714.60+064759.5
- Selection of ThAr lines for wavelength calibration of echelle spectra and implications for variations in the fine-structure constant
- Metallicity as a criterion to select H2 bearing Damped Lyman-alpha systems
- Excitation mechanisms in newly discovered H2-bearing Damped Lyman-alpha clouds: systems with low molecular fractions
- HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418
- Physical conditions in the neutral interstellar medium at z=2.43 toward Q2348-011
- Molecular Hydrogen in a Damped Lyman-alpha System at z_abs=4.224
- HD/H2 Molecular Clouds in the Early Universe: The Problem of Primordial Deuterium
- HD molecules at high redshift: The absorption system at z=2.3377 towards Q 1232+082
- Cosmological concordance or chemical coincidence? Deuterated molecular hydrogen abundances at high redshift
- Variability of the proton-to-electron mass ratio on cosmological scales