The DOI matches its Crossref record; 27 of the 27 references it cites were found in a registry or an index.
Probing the cosmological variation of the fine-structure constant: Results based on VLT-UVES sample
Open accessAbstract
Development of fundamental physics relies on the constancy of various fundamental quantities such as the fine-structure constant. Detecting or constraining the possible time variations of these fundamental physical quantities is an important step toward a complete understanding of basic physics. High-quality absorption lines seen in the spectra of distant QSOs allow one to probe time variations of several of these quantities. Here we present the results from a detailed many-multiplet analysis, to detect the possible variation of the fine-structure constant, performed using high signal-to-noise ratio, (~70 per pixel), high spectral resolution ( 45 000) observations of 23 Mg ii systems detected toward 18 QSOs in the redshift range obtained using UVES at the VLT. We validate our procedure and define the selection criteria that will avoid possible systematics using a detailed analysis of a simulated data set. The spectra of Mg ii doublets and Fe ii multiplets are generated considering variations in α and specifications identical to that of our UVES spectra. We show that our Voigt profile fitting code recovers the variation in α very accurately when we use single component systems and multiple-component systems that are not heavily blended. Spurious detections are frequently seen when we use heavily blended systems or systems with very weak lines. Thus we avoided these system while analysing the UVES data. To make the analysis transparent and accessible to the community for critical scrutiny, all the steps involved in the analysis are presented in detail. The weighted mean value of the variation in obtained from our analysis over the redshift range is = . The median redshift of our sample is 1.55 and corresponds to a look-back time of 9.7 Gyr in the most favored cosmological model today. The 3σ upper limit on the time variation of α is . To our knowledge this is the strongest constraint from quasar absorption line studies to till date.
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“In order to avoid as much systematics as possible, they apply a series of selection criteria (Chand et al. 2004) on the systems used: (1) consider only lines with similar ionization potentials (Mg II, Fe II, Si II and Al II) as they are most likely to originate from similar regions in the cloud; (2) avoid absorption lines contaminated by atmospheric lines; (3) consider only systems with hight”
From Fundamental constants: from measurement to the universe, a window on gravitation and cosmology (2025) · cites this paper as Chand et al. 2004
In the citing paper
“Chand et al. (2004) and Srianand et al. (2004) analyzed the observations of 23 systems satisfying these criteria in direction of 18 QSO with a S/N ranging between 50 and 80 per pixel a”
From Fundamental constants: from measurement to the universe, a window on gravitation and cosmology (2025) · cites this paper as Chand et al. 2004
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Citations
Cites
Edlén, B. (1966) · Metrologia · doi:10.1088/0026-1394/2/2/002 · Cited by 1,263
Further Evidence for Cosmological Evolution of the Fine Structure Constant
Webb, J. K., Murphy, M. T., Flambaum, V. V., Dzuba, V. A., Barrow, J. D., Churchill, C. W., Prochaska, J. X., & Wolfe, A. M. (2001) · Physical Review Letters · doi:10.1103/physrevlett.87.091301 · Cited by 824
CODATA recommended values of the fundamental physical constants: 1998
Mohr, P. J., & Taylor, B. N. (2000) · Reviews of Modern Physics · doi:10.1103/revmodphys.72.351 · Cited by 768
Atomic data for resonance absorption lines. I - Wavelengths longward of the Lyman limit
Morton, D. C. (1991) · The Astrophysical Journal Supplement Series · doi:10.1086/191601 · Cited by 720
Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
Murphy, M. T., Webb, J. K., & Flambaum, V. V. (2003) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2003.06970.x · Cited by 514 · cited 8×
“2 of Murphy et al. 2003).”
BackgroundMethodResultInfluentialSpace-Time Variation of Physical Constants and Relativistic Corrections in Atoms
Dzuba, V. A., Flambaum, V. V., & Webb, J. K. (1999) · Physical Review Letters · doi:10.1103/physrevlett.82.888 · Cited by 307 · cited 4×
“The numerical values of the parameter q that are obtained using many-body relativistic calculations (see Dzuba et al. 1999, 2002) for different species are listed in the fifth column of Table 1.”
MethodInfluentialMg isotopic ratios in giant stars of the globular cluster NGC 6752
Yong, D., Grundahl, F., Lambert, D. L., Nissen, P. E., & Shetrone, M. D. (2003) · Astronomy & Astrophysics · doi:10.1051/0004-6361:20030296 · Cited by 149 · cited 2×
“…systems and metallicity is measured to be larger than 0.1 Z (e.g. Ledoux et al. 2002); (ii) at Z ∼ 0.1 Z , which would be a more reasonable assumption, the composite wavelength we get will be close to the laboratory value we have used in our study (we use Yong et al. 2003 for isotopic abundances).”
BackgroundMethodInfluentialAstrophysical Limits on the Evolution of Dimensionless Physical Constants over Cosmological Time
Cowie, L. L., & Songaila, A. (1995) · The Astrophysical Journal · doi:10.1086/176422 · Cited by 148 · cited 1×
“Initial attempts to measure the variation in α were based on alkalidoublets (Wolfe et al. 1976; Levshakov 1994; Potekhin & Varshalovich 1994; Cowie & Songaila 1995; Murphy et al. 2001).”
MethodThe UCSD HIRES/Keck I Damped Lyα Abundance Database. I. The Data
Prochaska, J. X., Wolfe, A. M., Tytler, D., Burles, S. M., Cooke, J., Gawiser, E., Kirkman, D., O’Meara, J. M., & Storrie‐Lombardi, L. J. (2001) · The Astrophysical Journal Supplement Series · doi:10.1086/322542 · Cited by 130
Murphy, M. T., Webb, J. K., Flambaum, V. V., Prochaska, J. X., & Wolfe, A. M. (2001) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2001.04842.x · Cited by 127 · cited 3×
“Initial attempts to measure the variation in α were based on alkalidoublets (Wolfe et al. 1976; Levshakov 1994; Potekhin & Varshalovich 1994; Cowie & Songaila 1995; Murphy et al. 2001).”
MethodInfluential
Research works printed but not linked: 5
- Potekhin, 1994, A&AS, 104, 89
- Press, W., Teukolsky, S. A., Vellerling, W. T., et al. 2000, Numerical Recipes in Fortran: The art of Scientific Computing (Foundation Books), 690
- Stumpff, 1980, A&AS, 41, 1
- Uzan, 2003, RvMP, 75, 403
- Varshalovich, 1996, Astron. Lett., 22, 6
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Livio, M. (2007) · Cambridge University Press eBooks · doi:10.1017/cbo9780511536557.009 · Cited by 2
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Burigana, C., Capozzıello, S., Chiosi, C., D’Onofrio, M., Longair, M. S., Mannheim, P. D., Marziani, P., Milgrom, M., Olive, K. A., Padmanabhan, Τ., et al. (2009) · Springer eBooks · doi:10.1007/978-3-642-00792-7_4 · Cited by 2
“A ratio of (Mg + Mg)/Mg = 0:62 ̇ 0:05 (0:30 ̇ 0:01) is required by the data in [148] ([45]).”
BackgroundMethodInfluentialGRAVITATIONAL EFFECTS OF VARYING ALPHA STRINGS
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Barrow, J. D. (2005) · Journal of Physics Conference Series · doi:10.1088/1742-6596/24/1/031 · Cited by 2
Prause, N., & Reimers, D. (2013) · Springer Link (Chiba Institute of Technology) · doi:10.1051/0004-6361/201118373/pdf · Cited by 2
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Alvarez-Castillo, D. (2022) · Physics of Particles and Nuclei · doi:10.1134/s1063779622040025 · Cited by 2
Barrow, J. D. (2010) · Annalen der Physik · doi:10.1002/andp.201052203-509 · Cited by 2
Barrow, J. D. (2007) · Cambridge University Press eBooks · doi:10.1017/cbo9780511536557.010 · Cited by 2
Ivanchik, A. V., Varshalovich, D. A., & Petitjean, P. (2008) · The European Physical Journal Special Topics · doi:10.1140/epjst/e2008-00819-3 · Cited by 2
Self-citationEmergent Structures of Effective Field Theories
Uzan, J. (2017) · Cambridge University Press eBooks · doi:10.1017/9781316535783.007 · Cited by 1
High-Precision Measurements of Δα/αfrom QSO Absorption Spectra
Levshakov, S. A., Molaro, P. P., López, S., D’Odorico, S., Centurión, M., Bonifacio, P., Agafonova, I. I., & Reimers, D. (2008) · Springer eBooks · doi:10.1007/978-3-540-75485-5_23 · Cited by 1
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Hasan, S. S. (2014) · Springer eBooks · doi:10.1007/978-81-8489-998-6_6 · Cited by 1
Predictions of Gravity Theories
Baryshev, Y. V., & Teerikorpi, P. (2011) · Astrophysics and space science library · doi:10.1007/978-94-007-2379-5_6 · Cited by 1
Measuring Variations in the Fundamental Constants with the Square Kilometre Array
Curran, S. J. (2007) · Springer eBooks · doi:10.1007/978-3-540-39756-4_28 · Cited by 1
Can hidden correlations mimic a variable fine structure constant?
Bandiera, R., & Corbelli, E. (2005) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20041738 · Cited by 1
“Chand et al. (2004) avoid very weak and blended lines and point out that when one does not do so, spurious detections are frequently seen.”
BackgroundMethodResultInfluentialTesting the variation of fundamental constants with astrophysical and spectroscopic data
Olive, K. (2011) · Canadian Journal of Physics · doi:10.1139/p10-107 · Cited by 1
Can hidden correlations mimic a variable fine structure constant?
Bandiera, R., & Corbelli, E. (2005) · Springer Link (Chiba Institute of Technology) · doi:10.1051/0004-6361:20041738/pdf · Cited by 1
Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems
Petitjean, P., Srianand, R., Chand, H., Ivanchik, A. V., Noterdaeme, P., & Gupta, N. (2009) · Space sciences series of ISSI · doi:10.1007/978-1-4419-1362-3_21 · Cited by 1
Self-citationTesting the Stability of the Fine Structure Constant in the Laboratory
Kolachevsky, N., Matveev, A., Alnis, J., Parthey, C. G., Steinmetz, T., Wilken, T., Holzwarth, R., Udem, T., & Hänsch, T. W. (2009) · Space sciences series of ISSI · doi:10.1007/978-1-4419-1362-3_20 · Cited by 1
In Search of the Ideal Systems to Constrain the Variation of Fundamental Constants
Petitjean, P., Srianand, R., Noterdaeme, P., Ledoux, C., & Gupta, N. (2011) · Astrophysics and space science proceedings · doi:10.1007/978-3-642-19397-2_12 · Cited by 1
Self-citationOn the Variation of the Fine-structure Constant, and Precision Spectroscopy
Chand, H., Srianand, R., Petitjean, P., & Aracil, B. (2008) · Springer eBooks · doi:10.1007/978-3-540-75485-5_22
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García-Berro, E., Althaus, L. G., Torres, S., Lorén–Aguilar, P., Córsico, A. H., & Isern, J. (2011) · Astrophysics and space science proceedings · doi:10.1007/978-3-642-19397-2_6
Notes on the compatibility of type Ia supernovae data and varying-Gcosmology
Shojai, F., & Shojai, A. (2013) · Physica Scripta · doi:10.1088/0031-8949/88/05/055902
Non-expanding universe: a cosmological system of units
Alfonso‐Faus, A. (2010) · Astrophysics and Space Science · doi:10.1007/s10509-009-0252-y
“It has been pointed out by Xiaochun (2009) that the Robertson–Walker metric leads to the Galileo’s addition rule of velocity.”
BackgroundMathews, G. J., Ashenfelter, T. P., & Olive, K. A. (2005) · Nuclear Physics A · doi:10.1016/j.nuclphysa.2005.05.042
Izadi, A., Shojai, A., & Nouradini, M. (2013) · Journal of Astrophysics and Astronomy · doi:10.1007/s12036-013-9162-z
Manousos (2014) · Physics International · doi:10.3844/pisp.2014.21.35
Very light cosmological scalar fields from a tiny cosmological constant
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Thong, L. D., Hung, T. V., Hương, N. T. T., & Bang, H. H. (2010) · Astrophysics and Space Science · doi:10.1007/s10509-010-0431-x
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Spannowsky, M. (2024) · International Journal of Modern Physics A · doi:10.1142/s0217751x24410173
Metadata
- Authors
- Chand, H., Srianand, R., Petitjean, P., & Aracil, B.
- Affiliations
- Inter-University Centre for Astronomy and Astrophysics (IN)
- Centre National de la Recherche Scientifique (FR)
- Venue
- Astronomy & Astrophysics
- Publisher
- EDP Sciences
- Published
- 2004-03-26
- Volume
- 417
- Issue
- 3
- Pages
- 853-871
- ISSN
- 0004-6361 (ISSN-L)
- 1432-0746
- OpenAlex
- W2112768623
- Cited by
- 239
- References
- 27
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 2 · 2019: 3 · 2018: 3 · 2017: 7 · 2016: 8 · 2015: 7 · 2014: 11 · 2013: 14 · 2012: 7
- FWCI
- 16.32
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Astronomy and Astrophysics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Council of Scientific and Industrial Research, India
- Indo-French Centre for the Promotion of Advanced Research
- European Southern Observatory (166.A-0106)
- Centre National de la Recherche Scientifique
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- fine-structure constant variation, variation of fundamental constants, quasar absorption lines, Mg II doublet, Voigt profile fitting, cosmological constraints
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