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.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“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
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
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
Cited by
Sorted by citations
Items 101–200 of 239
Fundamental constants: from measurement to the universe, a window on gravitation and cosmology
Uzan, J.-P. (2025) · Living Reviews in Relativity · doi:10.1007/s41114-025-00059-y · Cited by 36
Composition-dependent long range forces from varying mp/me
Dent, T. (2007) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2007/01/013 · Cited by 30
Varying alpha: New constraints from seasonal variations
Barrow, J. D., & Shaw, D. J. (2008) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.78.067304 · Cited by 29
Barrow, J. D. (2010) · Annalen der Physik · doi:10.1002/andp.201010416 · Cited by 29
Wilczynska, M. R., Webb, J. K., King, J. A., Murphy, M. T., Bainbridge, M., & Flambaum, V. V. (2015) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stv2148 · Cited by 30
The quasar proximity effect at redshift 〈z〉≃ 2.6 with the From Lines to Overdensities approach★
D’Odorico, V., Bruscoli, M., Saitta, F., Fontanot, F., Viel, M., Cristiani, S., & Monaco, P. (2008) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2008.13611.x · Cited by 27
“In the spectra of the two QSOs at higher redshift (Q0420-388 and PKS216-158), there are three gaps centred at ∼5640 and 8600 Å of about 100 Å and at ∼6680 Å of width ∼50 Å. Details of the data reduction can be found in Chand et al. (2004) and Aracil et al. (2004).”
BackgroundQuantum corrections in quintessence models
Garny, M. (2006) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.74.043009 · Cited by 27
The variation of the gravitational constant inferred from the Hubble diagram of Type Ia supernovaePreprint
Kubyshin, Y., & Isern, J. (2006) · Cited by 33
Testing 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 Science Reviews · doi:10.1007/s11214-009-9564-z · Cited by 26
Can we test dark energy with running fundamental constants?
Doran, M. (2005) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2005/04/016 · Cited by 27
Shaw, D. J., & Barrow, J. D. (2006) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.73.123506 · Cited by 24
Varying electric charge in multiscale spacetimes
Calcagni, G., Magueijo, J., & Fernández, D. R. (2014) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.89.024021 · Cited by 24
“However, data from the Very Large Telescope (VLT) on different samples and using different methods of analysis gave results compatible with a non-variation of α [18, 19] and there is some ongoing debate [20–22] (again, see [10] for a review).”
MethodLevshakov, S. A., Centurión, M., Molaro, P. P., & Костина, М. В. (2006) · Astronomy and Astrophysics · doi:10.1051/0004-6361:200600001 · Cited by 24
“However,thevariability of hasnotbeen supported bym orerecentstudies(Q uastetal.2004;Chand et al.2004;Levshakov etal.2005a,b).”
BackgroundWere Fundamental Constants Different in the Past?
Olive, K. A., & Qian, Y.-Z. (2004) · Physics Today · doi:10.1063/1.1825267 · Cited by 24
Cosmological evolution ofαandμand the dynamics of dark energy
Avelino, P. P. (2008) · Physical Review D · doi:10.1103/physrevd.78.043516 · Cited by 22
Varying electromagnetic coupling and primordial magnetic fields
Orfeu Bertolami, A., & Monteiro, R. (2005) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.71.123525 · Cited by 22
Measuring changes in the fundamental constants with redshifted radio absorption lines
Curran, S. J., Kanekar, N., & Darling, J. (2004) · New Astronomy Reviews · doi:10.1016/j.newar.2004.09.004 · Cited by 22
Observational Constraints on Varying-Alpha Domain Walls
Avelino, P. P., & Sousa, L. (2015) · Universe · doi:10.3390/universe1010006 · Cited by 21
“However, ensuing studies based on VLT/UVES data have indicated a much smaller value of ∆α/α [29,30].”
BackgroundCosmological evolution of fundamental constants: From theory to experiment
Calmet, X., & Keller, M. (2015) · Modern Physics Letters A · doi:10.1142/s0217732315400283 · Cited by 22
Dzuba, V. A., & Johnson, W. R. (2007) · Physical Review A · doi:10.1103/physreva.76.062510 · Cited by 20
A study of quasar proximity in O vi absorbers atz= 2-3★
Fox, A. J., Bergeron, J., & Petitjean, P. (2008) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2008.13529.x · Cited by 20
“The full details of the reduction process are given in Chand et al. (2004) and Aracil et al. (2004).”
BackgroundSelf-citationTime evolution of the fine structure constant in a two-field quintessence model
Bento, M. C., Orfeu Bertolami, A., & Santos, N. M. C. (2004) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.70.107304 · Cited by 20
VARYING ALPHA FROMN-BODY SIMULATIONS
Li, B., Mota, D. F., & Barrow, J. D. (2011) · The Astrophysical Journal · doi:10.1088/0004-637x/728/2/108 · Cited by 18
“A smaller study of 23 VLT-UVES absorption systems between 0.4 ≤ z ≤ 2.3 by Chand et al. (2004) and Siranand et al. (2004) initially found ∆α/α = −0.6±0.6×10−6 by using an approximate version of the full MM technique.”
InfluentialRunaway domain wall and space-time varying α
Chiba, T., & Yamaguchi, M. (2011) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2011/03/044 · Cited by 18
Probing the constancy of the speed of light with future galaxy survey: The case of SKA and Euclid
Salzano, V., Da̧browski, M. P., & Lazkoz, R. (2016) · Physical review. D/Physical review. D. · doi:10.1103/physrevd.93.063521 · Cited by 18
Where are the walls? Spatial variation in the fine-structure constant
Olive, K. A., Peloso, M., & Peterson, A. (2012) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.86.043501 · Cited by 17
Varying alpha driven by the Dirac–Born–Infeld scalar field
Wei, H. (2009) · Physics Letters B · doi:10.1016/j.physletb.2009.10.086 · Cited by 18
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 Science Reviews · doi:10.1007/s11214-009-9520-y · Cited by 16
“Simulations by Chand et al. (2004) showed that errors are inversely correlated with SNR.”
BackgroundMethodInfluentialSelf-citationConstraining cosmologies with fundamental constants – I. Quintessence and K-essence
Thompson, R. I., Martins, C. J. A. P., & Vielzeuf, P. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sts187 · Cited by 16
Berengut, J. C., Dzuba, V. A., Flambaum, V. V., King, J. A., Kozlov, M. G., Murphy, M. T., & Webb, J. K. (2011) · Astrophysics and space science proceedings · doi:10.1007/978-3-642-19397-2_2 · Cited by 16
Sanejouand, Y. (2009) · Europhysics Letters (EPL) · doi:10.1209/0295-5075/88/59002 · Cited by 15
“Indeed, it has been shown that α depends little upon the redshift (Webb et al. 1999), if it does at all (Uzan 2003; Chand et al. 2004).”
Recovering a redshift-extended varying speed of light signal from galaxy surveys
Salzano, V. (2017) · Physical review. D/Physical review. D. · doi:10.1103/physrevd.95.084035 · Cited by 15
Thomson scattering: one rate to rule them all
Greene, K., & Cyr-Racine, F.-Y. (2023) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2023/10/065 · Cited by 23
White Dwarf Spectra for Studies of Time Variation of the Fine Structure Constant
Le, T. D. (2019) · Brazilian Journal of Physics · doi:10.1007/s13538-018-00634-5 · Cited by 14
Tracing the gas at redshift 1.7-3.5 with the Lyα forest: the FLO approach★
Saitta, F., D’Odorico, V., Bruscoli, M., Cristiani, S., Monaco, P., & Viel, M. (2008) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2008.12860.x · Cited by 14
“Details of the data reduction can be found in Chand et al. (2004); Aracil et al. (2004).”
BackgroundDark energy constraints from ESPRESSO tests of the stability of fundamental couplings
Leite, A. C. O., Martins, C. J. A. P., Molaro, P. P., Corre, D., & Cristiani, S. (2016) · Physical review. D/Physical review. D. · doi:10.1103/physrevd.94.123512 · Cited by 13
Δα/α FROM QSO ABSORPTION LINES DRIVEN BY AN OSCILLATING SCALAR FIELD
Fujii, Y., & Mizuno, S. (2005) · International Journal of Modern Physics D · doi:10.1142/s021827180500664x · Cited by 13
Revisiting the He ii to H i ratio in the intergalactic medium
Muzahid, S., Srianand, R., & Petitjean, P. (2010) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2010.17592.x · Cited by 13
“The detailed quantitative description of data calibration is presented in Aracil et al. (2004) and Chand et al. (2004).”
BackgroundSelf-citationLiu, Z.-E., Liu, W., 张, T.-J. 同. Z., Zhai, Z., & Bora, K. (2021) · The Astrophysical Journal · doi:10.3847/1538-4357/ac2150 · Cited by 13
“…telescopes have produced a large data sample that describes the dependence of Δα/α on redshift z, in which the variations of α are normally constrained by Δα/α≈ 10−5–10−6 (Murphy et al. 2001a, 2001b, 2001c, 2003, 2004, 2007, 2008; Chand et al. 2004; Srianand et al. 2004; Webb et al. 1999, 2001).”
BackgroundTHE VALUE OF THE FINE STRUCTURE CONSTANT OVER COSMOLOGICAL TIMES
Gutiérrez, C. M., & López-Corredoira, M. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/713/1/46 · Cited by 13
“…Murphy et al. 2003) Δα/α = (−0.574 ± 0.102) × 10−5 in the range 0.2 z 3.7 although these results are controversial (see Chand et al. 2006; but also see Murphy et al. 2008 on the opposite view) and are at odds with similar studies (Chand et al. 2004; Srianand et al. 2004; Levshakov et al. 2007).”
ResultInfluentialEvolution of the fine-structure constant in the non-linear regime
Avelino, P. P., Martins, C. J. A. P., Menezes, J., & dos Santos, C. (2006) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2006/12/018 · Cited by 13
Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants
Fischer, M., Kolachevsky, N., Zimmermann, M., Holzwarth, R., Udem, T., Hänsch, T. W., Abgrall, M., Grünert, J., Maksimovic, I., Bize, S., et al. (2004) · Lecture notes in physics · doi:10.1007/978-3-540-40991-5_13 · Cited by 16
Particle Data Group (2008) · Physics Letters B · doi:10.1016/j.physletb.2008.07.028 · Cited by 11
DO THE FUNDAMENTAL CONSTANTS CHANGE WITH TIME?
Kanekar, N. (2008) · Modern Physics Letters A · doi:10.1142/s0217732308028521 · Cited by 13
Cosmic strings in Bekenstein-type modelsPreprint
Menezes, J., Avelino, P., & dos Santos, C. (2004) · Cited by 13
INCIDENCE OF Mg II ABSORPTION SYSTEMS TOWARD FLAT-SPECTRUM RADIO QUASARS
Chand, H., & Gopal-Krishna (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/754/1/38 · Cited by 12
Self-citationRuffoni, M. P., & Pickering, J. C. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/725/1/424 · Cited by 12
Graham, A. A. H. (2014) · Classical and Quantum Gravity · doi:10.1088/0264-9381/32/1/015019 · Cited by 10
“Despite much discussion in the literature these results have neither been refuted nor confirmed [10, 11].”
ResultA NEW METHOD FOR DETECTING VELOCITY SHIFTS AND DISTORTIONS BETWEEN OPTICAL SPECTRA
Evans, T. M., & Murphy, M. T. (2013) · The Astrophysical Journal · doi:10.1088/0004-637x/778/2/173 · Cited by 11
“In the years following Murphy et al. (2004), a few small samples of absorption systems were published (e.g., Chand et al. 2004; cf. Murphy et al. 2008b; Levshakov et al. 2005), however (A color version of this figure is available in the online journal.) the next large sample with strong statistical…”
BackgroundInfluentialCosmic variation of proton-to-electron mass ratio with an interacting Higgs scalar field
Chakrabarti, S. (2021) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stab1910 · Cited by 12
Can we test Dark Energy with Running Fundamental Constants ?
Doran, M. (2004) · CERN Document Server (European Organization for Nuclear Research) · Cited by 11
A slitless spectroscopic survey for quasars near quasars
Worseck, G., Wisotzki, L., & Selman, F. (2008) · Astronomy and Astrophysics · doi:10.1051/0004-6361:200810157 · Cited by 11
“…have been heavily used in recent quasar absorption line studies, for example to constrain the evolution of the fine structure constant (Murphy et al. 2003; Chand et al. 2004) and to obtain precise measurements of the flux distribution in the Lyα forest (Becker et al. 2007; Kim et al. 2007).”
Menezes, J., Avelino, P. P., & dos Santos, C. (2005) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.72.103504 · Cited by 11
Nasseri, F. (2005) · Physics Letters B · doi:10.1016/j.physletb.2005.05.050 · Cited by 11
Srianand, R., Gupta, N., & Petitjean, P. (2007) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2006.11280.x · Cited by 10
“The detailed quantitative description of data calibration is presented in Aracil et al. (2004) and Chand et al. (2004).”
BackgroundSelf-citationAn investigation of the line of sight towards QSO PKS 0237−233★
Fathivavsari, H., Petitjean, P., Ledoux, C., Noterdaeme, P., Srianand, R., Rahmani, H., & Ajabshirizadeh, A. (2013) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stt1411 · Cited by 10
“The detailed quantitative description of data calibration is presented in Aracil et al. (2004) and Chand et al. (2004, 2006).”
MethodSelf-citationCosmic strings in Bekenstein-type models
Menezes, J., Avelino, P. P., & Santos, C. (2005) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2005/02/003 · Cited by 10
Non-linear electrodynamics and the variation of the fine structure constant
Mbelek, J. P., & Cuesta, H. J. M. (2008) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2008.13503.x · Cited by 10
“This could be the case of Chand et al. (2004), Srianand et al. (2004) samples, but see Murphy et al. (2007) quoted above and the answer of Srianand et al. (2007), (ii) a negative variation of αobs should be observed from any sample of absorbing intergalactic gas cloud such that B > Bc [case of…”
BackgroundInfluentialPhase transition in the fine structure constant
Anchordoqui, L. A., Barger, V. D., Goldberg, H., & Marfatia, D. (2008) · Physics Letters B · doi:10.1016/j.physletb.2008.01.047 · Cited by 10
A possible new interpretation of the results of Δα/α from QSO absorption lines
Fujii, Y. (2005) · Physics Letters B · doi:10.1016/j.physletb.2005.04.070 · Cited by 10
Fundamental physics with ESPRESSO: Constraining a simple parametrisation for varying α
da Fonseca, V., Barreiro, T., Nunes, N. J., Cristiani, S., Cupani, G., D’Odorico, V., Leite, A. C. O., Marques, C. M. J., Martins, C. J. A. P., Milaković, D., et al. (2022) · Astronomy and Astrophysics · doi:10.1051/0004-6361/202243795 · Cited by 9
Savukov, I., & Dzuba, V. A. (2008) · Physical Review A · doi:10.1103/physreva.77.042501 · Cited by 9
CONSTRAINTS ON THAWING SCALAR FIELD MODELS FROM FUNDAMENTAL CONSTANTS
GAO, Q., & GONG, Y. (2013) · International Journal of Modern Physics D · doi:10.1142/s0218271813500351 · Cited by 9
Possible time-variability of the fine-structure constant expected from the accelerating universe
Fujii, Y. (2008) · Physics Letters B · doi:10.1016/j.physletb.2007.12.044 · Cited by 9
Variation of the fine-structure constant: an update of statistical analyses with recent data
Kraiselburd, L., Landau, S. J., & Simeone, C. (2013) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201321803 · Cited by 10
“1, Srianand et al. (2007) have recognized that the data in Chand et al. (2004) should be reanalyzed.”
BackgroundMethodResultFundamental Constants in Physics and their Time Dependence
FRITZSCH, H. (2008) · CERN Document Server (European Organization for Nuclear Research) · Cited by 9
Revisiting the He II to H I ratio in the intergalactic mediumPreprint
Muzahid, S., Srian, R., & Petitjean, P. (2016) · Cited by 9
Self-citationBarrow, J. D., & Magueijo, J. (2014) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.90.123506 · Cited by 8
Science with a 16 m VLT: The Case for Variability of Fundamental Constants
Molaro, P. P. (2008) · Astrophysics and space science proceedings · doi:10.1007/978-1-4020-9190-2_67 · Cited by 8
Time dependence of the proton-to-electron mass ratio
Petitjean, P., Ivanchik, A. V., Srianand, R., Aracil, B., Varshalovich, D. A., Chand, H., Rodriguez, E., Ledoux, C., & Boissé, P. (2004) · Comptes Rendus Physique · doi:10.1016/j.crhy.2004.04.007 · Cited by 8
Self-citationNormal DGP in varying speed of light cosmology
Ravanpak, A., Farajollahi, H., & Fadakar, G. F. (2017) · Research in Astronomy and Astrophysics · doi:10.1088/1674-4527/17/3/26 · Cited by 7
On the incidence of Mg ii absorbers along the blazar sightlines
Mishra, S., Chand, H., Krishna, G., Joshi, R., Shchekinov, Y. A., & Fatkhullin, T. A. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stx2684 · Cited by 7
“…of each one-dimensional spectrum, which involves steps such as airto-vacuum wavelength conversion, heliocentric correction, combining individual exposures for SNR enhancement and continuum fitting to determine the normalized spectrum, we have followed the procedure described in Chand et al. (2004).”
MethodSelf-citationThe fundamental constants in physics and their time dependence
Fritzsch, H. (2008) · Progress in Particle and Nuclear Physics · doi:10.1016/j.ppnp.2008.03.001 · Cited by 7
Le, T. D. (2018) · Symmetry · doi:10.3390/sym10120722 · Cited by 7
“, which included closely blended components, probed ∆α/α regarding the apparent position shifts caused by unresolved line blends [39].”
BackgroundBlain, A. W., Carilli, C. L., & Darling, J. (2004) · New Astronomy Reviews · doi:10.1016/j.newar.2004.09.009 · Cited by 7
“Highly controversial remains possible evolution of the fine-structure constant has been suggested based on optical observations of QSO absorption lines (e.g. Murphy, Webb & Flambaum 2003; Chand et al. 2004).”
MethodRevisiting VLT/UVES Constraints on a Varying Fine-structure Constant
Murphy, M. T., Webb, J. K., & Flambaum, V. V. (2008) · Springer eBooks · doi:10.1007/978-3-540-75485-5_21 · Cited by 7
“For many absorbers in Chand et al. (2004) and for the single-absorber constraint of Levshakov et al. (2006) the quoted uncertainties are smaller than the minimum allowed by the UVES data.”
BackgroundOn generalized theories of varying fine structure constant
Chakrabarti, S. (2022) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stac979 · Cited by 7
Fundamental physical constants
Harald Fritzsch, A. (2009) · Uspekhi Fizicheskih Nauk · doi:10.3367/ufnr.0179.200904d.0383 · Cited by 6
Direct Measurement of Quasar Outflow Wind Acceleration* † ‡
Misawa, T., Eracleous, M., Charlton, J. C., & Kashikawa, N. (2019) · The Astrophysical Journal · doi:10.3847/1538-4357/aaf0fe · Cited by 6
“…expansion (e.g., Sandage 1962; Loeb 1998; Balbi & Quercellini 2007; Liske et al. 2008) and a measurement of changes in the fine structure constant (e.g., Murphy et al. 2003; Chand et al. 2004; Srianand et al. 2004; Webb et al. 2011) using extremely large (30-m class) telescopes in coming decades.”
Charge non-conservation, dequantisation, and induced electric dipole moments in varying-α theories
Shaw, D. J. (2005) · Physics Letters B · doi:10.1016/j.physletb.2005.10.033 · Cited by 6
Constraints on field theoretical models for variation of the fine structure constant
Steinhardt, C. L. (2005) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.71.043509 · Cited by 6
Impact of the matter density uncertainty on the dark energy reconstruction
Avelino, P. P. (2009) · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · doi:10.1103/physrevd.79.083516 · Cited by 6
A slitless spectroscopic survey for quasars near quasars
Worseck, G., Wisotzki, L., & Selman, F. J. (2008) · Springer Link (Chiba Institute of Technology) · doi:10.1051/0004-6361:200810157/pdf · Cited by 6
Constraints on thawing scalar field models from fundamental constantsPreprint
Gao, Q., & Gong, Y. (2014) · Cited by 6
Can a variation of fine structure constant influence the fate of gravitational collapse?
Chakrabarti, S. (2023) · The European Physical Journal C · doi:10.1140/epjc/s10052-023-11877-1 · Cited by 6
Revised fits to Δα/α in consistency with the accelerating universe
Fujii, Y. (2008) · Physics Letters B · doi:10.1016/j.physletb.2008.11.073 · Cited by 5
Prause, N., & Reimers, D. (2013) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201118373 · Cited by 5
“Chand et al. (2004) have probed the possibility ofapparent position shifts due to unresolved line blends by simulating systems consisting of two closely blended components.”
BackgroundSolovyev, D. A. (2013) · Physics Letters A · doi:10.1016/j.physleta.2013.07.022 · Cited by 5
QSNET, a network of clocks for measuring the stability of fundamental constants
Barontini, G., Boyer, V., Xavier Calmet, A., Fitch, N. J., Forgan, E. M., Godun, R. M., Goldwin, J., Guarrera, V., Hill, I. R., Jeong, M., et al. (2021) · Sussex Research Online (University of Sussex) · doi:10.48550/arxiv.2110.05944 · Cited by 5
Laboratory search for time variation in the fine structure constant
Kolachevsky, N. (2004) · Uspekhi Fizicheskih Nauk · doi:10.3367/ufnr.0174.200411b.1171 · Cited by 5
Dark Energy Constraints from Espresso Tests of the Stability of Fundamental Couplings
Leite, A. C. O., Martins, C. J. A. P., & Molaro, P. P. (2017) · Universe · doi:10.3390/universe3020030 · Cited by 5
Cosmology from a running vacuum model driven by a scalar field
Santos, J. R. L., & Moraes, P. H. R. S. (2019) · International Journal of Geometric Methods in Modern Physics · doi:10.1142/s0219887820500164 · Cited by 5
“In [53], the authors presented the results from a detailed many-multiplet analysis of 18 quasars, in the redshift range 0.”
BackgroundLehnert, K. (2026) · Fortschritte der Physik · doi:10.1002/prop.70073 · Cited by 15
Observable effects of scalar fields and varying constants
Barrow, J. D., & Shaw, D. J. (2007) · General Relativity and Gravitation · doi:10.1007/s10714-007-0453-z · Cited by 4
The time variation of the fine structure constant: a statistical analysis of astronomical data
Landau, S. J., & Simeone, C. (2008) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20079125 · Cited by 4
“…the confidence intervals analysis we conclude that there is consistency over the intervals (0.452, 1.14) and (1.93, 2.3), i.e., 11 data points from Chand et al. (2004) are consistent with 70 data points from Murphy et al. (2003) (only 103 of the 128 data points are eligible to be tested against…”
BackgroundMethodResultInfluentialUdem, T., Zimmermann, M., Holzwarth, R., Fischer, M., Kolachevsky, N., & Hänsch, T. W. (2006) · Kluwer Academic Publishers eBooks · doi:10.1007/0-387-23791-7_7 · Cited by 4
Zhai, Z., Liu, X., Zhang, Z., & Zhang, T.-J. (2013) · Research in Astronomy and Astrophysics · doi:10.1088/1674-4527/13/12/003 · Cited by 4
“Chand et al.(2004); Srianand et al.(2004) based on the observations of VLT.”
BackgroundInfluentialDzuba, V. A., & Flambaum, V. V. (2010) · Physical Review A · doi:10.1103/physreva.81.034501 · Cited by 4
QSNET, a network of clock for measuring the stability of fundamental constants
Barontini, G., Boyer, V., Calmet, X., Fitch, N. J., Forgan, E. M., Godun, R. M., Goldwin, J., Guarrera, V., Hill, I. R., Jeong, M., et al. (2021) · Quantum Technology: Driving Commercialisation of an Enabling Science · doi:10.1117/12.2600493 · Cited by 9
High-resolution spectroscopy of flat-spectrum quasars
Tappe, A., & Black, J. H. (2004) · Astronomy and Astrophysics · doi:10.1051/0004-6361:20035861 · Cited by 4
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
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
