Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Revisiting VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
Abstract not available.
Revisiting VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
Abstract not available.
Murphy, Michael T., Flambaum, Victor V., Muller, Sébastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Revisiting VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
Abstract not available.
Murphy, Michael T., Flambaum, Victor V., Muller, Sébastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Revisiting VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, Michael T., Webb, J. K., Flambaum, Victor V.
Abstract not available.
Revision of VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We critically review the current null results on a varying fine-structure constant, α, derived from Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar...
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Revisiting VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, Michael T., Webb, J. K., Flambaum, Victor V.
Abstract not available.
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Revision of VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We critically review the current null results on a varying fine-structure constant, α, derived from Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar absorption...
Murphy, Michael T., Webb, John K., Flambaum, Victor V.
In their Letter [Phys. Rev. Lett. 92, 121302 (2004)] (also [Astron. Astrophys. 417, 853 (2004)]), Srianand et al. analysed optical spectra of heavy-element species in 23 absorption systems along...
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
A comment on the letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the letter offer a reply.
Tzanavaris, Panayiotis, Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V., Curran, Stephen J.
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x equivalent to alpha(2)g(p)mu, where alpha is the fine structure...
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
A comment on the letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the letter offer a reply.
Tzanavaris, Panayiotis, Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V., Curran, Stephen J.
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x equivalent to alpha(2)g(p)mu, where alpha is the fine structure...
Tzanavaris, Panayiotis, Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V., Curran, Stephen J.
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x equivalent to alpha(2)g(p)mu, where alpha is the fine structure...
Murphy, Michael T., Webb, Jonathan K., Flambaum, Victor V.
A comment on the letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the letter offer a reply.
Murphy, Michael T., Webb, J. K., Flambaum, Victor V.
A comment on the letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the letter offer a reply.
Tzanavaris, Panayiotis, Murphy, Michael T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x equivalent to alpha(2)g(p)mu, where alpha is the fine structure...
Murphy, Michael T., Webb, J. K., Flambaum, Victor V.
A comment on the letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the letter offer a reply.
Tzanavaris, Panayiotis, Murphy, Michael T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
Nine quasar absorption spectra at 21-cm and ultraviolet (UV) rest-frame wavelengths are used to estimate possible variations in x equivalent to alpha(2)g(p)mu, where alpha is the fine structure...
Revision of VLT/UVES constraints on a varying fine-structure constant (2006)
Murphy, Michael T., Webb, John K., Flambaum, Victor V.
We critically review the current null results on a varying fine-structure constant, alpha, derived from VLT/UVES quasar absorption spectra, focusing primarily on the many-multiplet analysis of 23...
Tzanavaris, Panayiotis, Webb, J. K., Murphy, Michael T., Flambaum, Victor V., Curran, Stephen J.
Abstract not available.
Tzanavaris, Panayiotis, Webb, Jonathan K., Murphy, Michael T., Flambaum, Victor V., Curran, Stephen J.
Abstract not available.
Tzanavaris, Panayiotis, Webb, J. K., Murphy, Michael T., Flambaum, Victor V., Curran, Stephen J.
Abstract not available.
Murphy, Michael T., Flambaum, Victor V., Webb, J. K., Dzuba, Vladimir V., Prochaska, Jason X., Wolfe, Arthur M.
We present evidence for variations in the fine-structure constant from Keck/HIRES spectra of 143 quasar absorption systems over the redshift range 0.2 < zabs < 4.2. This includes 15 new systems,...
Murphy, Michael T., Flambaum, Victor V., Webb, J. K., Dzuba, Vladimir V., Prochaska, Jason X., Wolfe, Arthur M.
We present evidence for variations in the fine-structure constant from Keck/HIRES spectra of 143 quasar absorption systems over the redshift range 0.2 < zabs < 4.2. This includes 15 new systems,...
Webb, J. K., Murphy, Michael T., Flambaum, Victor V., Curran, Stephen J.
We report results from a third sample of quasar absorption line spectra from the Keck telescope which has been studied to search for any possible variation of the fine structure constant, α. This...
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We have previously presented evidence for a varying fine-structure constant, α, in two independent samples of Keck/HIRES quasi-stellar object (QSO) absorption spectra. Here we present a detailed...
Does the fine structure constant vary?: a detailed investigation into systematic effects (2003)
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We have previously presented 5.7 σ evidence for a smaller αat redshifts 0.2 < zabs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: Δα/α = (-0.57 ± 0.10) x10-5. A non-zero
Webb, J. K., Murphy, Michael T., Flambaum, Victor V., Curran, Stephen J.
We report results from a third sample of quasar absorption line spectra from the Keck telescope which has been studied to search for any possible variation of the fine structure constant, α. This...
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We have previously presented evidence for a varying fine-structure constant, α, in two independent samples of Keck/HIRES quasi-stellar object (QSO) absorption spectra. Here we present a detailed...
Does the fine structure constant vary?: a detailed investigation into systematic effects (2003)
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We have previously presented 5.7 σ evidence for a smaller αat redshifts 0.2 < zabs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: Δα/α = (-0.57 ± 0.10) x10-5. A non-zero
Time evolution of the fine structure constant (2002)
Murphy, Michael T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We present a short review of the current quasar (QSO) absorption line constraints on possible variation of the fine structure constant, α ≡ e2/¯hc. Particular attention is paid to...
Curran, Stephen J., Webb, J. K., Murphy, M. T., Bandiera, Rino, Corbelli, Edvige, Flambaum, Victor V.
We present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Time evolution of the fine structure constant (2002)
Murphy, Michael T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We present a short review of the current quasar (QSO) absorption line constraints on possible variation of the fine structure constant, α ≡ e2/¯hc. Particular attention is paid to...
Curran, Stephen J., Webb, J. K., Murphy, M. T., Bandiera, Rino, Corbelli, Edvige, Flambaum, Victor V.
We present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Dzuba, V. A., Churchill, Christopher W., Prochaska, Jason X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar (QSO) absorption-line spectra with...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Churchill, Christopher W., Prochaska, Jason X.
Comparison of quasar (QSO) absorption spectra with laboratory spectra allows us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we...
Relativistic effects in NiII and the search for variation of the fine-structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, M. T., Webb, J. K.
Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical “constants” in the Universe. Detection of high redshift absorption...
Further evidence for cosmological evolution of the fine structure constant (2001)
Webb, J. K., Murphy, M. T., Flambaum, Victor V., Dzuba, V. A., Barrow, John D., Churchill, Christopher W., ...
We describe the results of a search for time variability of the fine structure constant α using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Drinkwater, Michael J., Combes, Francoise, Wiklind, Tommy
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of HI 21-cm absorption with corresponding molecular...
Relativistic corrections in atoms and space-time variation of the fine structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, Michael T., Webb, J. K.
Comparison of quasar absorption line spectra with laboratory spectra provides the best probe for variability of the fine structure constant, α = e 2/ħc, over cosmological time-scales. We...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Prochaska, Jason X., Wolfe, Arthur M.
Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Dzuba, V. A., Churchill, Christopher W., Prochaska, Jason X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar (QSO) absorption-line spectra with...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Churchill, Christopher W., Prochaska, Jason X.
Comparison of quasar (QSO) absorption spectra with laboratory spectra allows us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we...
Relativistic effects in NiII and the search for variation of the fine-structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, M. T., Webb, J. K.
Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical “constants” in the Universe. Detection of high redshift absorption...
Further evidence for cosmological evolution of the fine structure constant (2001)
Webb, J. K., Murphy, M. T., Flambaum, Victor V., Dzuba, V. A., Barrow, John D., Churchill, Christopher W., ...
We describe the results of a search for time variability of the fine structure constant α using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Drinkwater, Michael J., Combes, Francoise, Wiklind, Tommy
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of HI 21-cm absorption with corresponding molecular...
Relativistic corrections in atoms and space-time variation of the fine structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, Michael T., Webb, J. K.
Comparison of quasar absorption line spectra with laboratory spectra provides the best probe for variability of the fine structure constant, α = e 2/ħc, over cosmological time-scales. We...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Prochaska, Jason X., Wolfe, Arthur M.
Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We...
A Search for Time Variation of the Fine Structure Constant (1998)
Webb, John K., Flambaum, Victor V., Churchill, Christopher W., Drinkwater, Michael J., Barrow, John D.
A method offering an order of magnitude sensitivity gain is described for using quasar spectra to investigate possible time or space variation in the fine structure constant, alpha. Applying the...