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- Publications
- Influence
Limit on the cosmological variation of mp/me from the inversion spectrum of ammonia.
- V. Flambaum, M. Kozlov
- Physics, Medicine
- Physical review letters
- 15 June 2007
We obtain the limit on the space-time variation of the ratio of the proton mass to the electron mass, mu=m(p)/m(e), based on comparison of quasar absorption spectra of NH3 with CO, HCO+ and HCN… Expand
Methanol as A Tracer of Fundamental Constants
- S. Levshakov, M. Kozlov, D. Reimers
- Physics
- 8 June 2011
The methanol molecule CH{sub 3}OH has a complex microwave spectrum with a large number of very strong lines. This spectrum includes purely rotational transitions as well as transitions with… Expand
Blackbody-radiation shift in the Sr optical atomic clock
- M. Safronova, S. Porsev, U. Safronova, M. Kozlov, C. Clark
- Physics
- 26 October 2012
We evaluated the static and dynamic polarizabilities of the $5{s}^{2}\phantom{\rule{0.16em}{0ex}}{}^{1}{S}_{0}$ and $5s5p\phantom{\rule{0.16em}{0ex}}{}^{3}{P}_{0}^{o}$ states of Sr using the… Expand
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
- S. Levshakov, D. Reimers, M. Kozlov, S. Porsev, P. Molaro
- Physics
- 18 December 2007
Aims. We aim to obtain limits on the variation of the fine-structure constant α and the electron-to-proton mass ratio μ over different cosmological epochs. Methods. A new approach based on the… Expand
Searching for chameleon-like scalar fields with the ammonia method , II. Mapping of cold molecular cores in NH3 and HC3N lines
- S. Levshakov, A. Lapinov, +4 authors I. I. Agafonova
- Physics
- 6 August 2010
Context. In our previous work we found a statistically significant offset ΔV ≈ 27 m s −1 between the radial velocities of the HC3N J = 2− 1a nd NH 3 (J,K) = (1, 1) transitions observed in molecular… Expand
ELECTRIC-DIPOLE AMPLITUDES, LIFETIMES, AND POLARIZABILITIES OF THE LOW-LYING LEVELS OF ATOMIC YTTERBIUM
- S. Porsev, Yu. G. Rakhlina, M. Kozlov
- Physics
- 1 October 1999
Centre for Optics and Atomic Physics, Sussex University, Falmer, Brighton BN1 9QH, United Kingdom~Received 2 March 1999!The results of ab initio calculations of electric-dipole amplitudes, lifetimes,… Expand
Flavor physics of leptons and dipole moments
This chapter of the report of the “Flavor in the era of the LHC” Workshop discusses the theoretical, phenomenological and experimental issues related to flavor phenomena in the charged lepton sector… Expand
Λ -doublet spectra of diatomic radicals and their dependence on fundamental constants
- M. Kozlov
- Physics
- 11 May 2009
$\Lambda$-doublet spectra of light diatomic radicals have high sensitivity to the possible variations of the fine structure constant alpha and electron-to-proton mass ratio beta. For molecules OH and… Expand
An upper limit to the variation in the fundamental constants at redshift z = 5.2
- S. Levshakov, F. Combes, F. Boone, I. I. Agafonova, D. Reimers, M. Kozlov
- Physics
- 16 March 2012
Aims. We constrain a hypothetical variation in the fundamental physical constants over the course of cosmic time. Methods. We use unique observations of the CO(7-6) rotational line and the (Ci) 3 P2… Expand
SENSITIVITY OF THE H3O+ INVERSION-ROTATIONAL SPECTRUM TO CHANGES IN THE ELECTRON-TO-PROTON MASS RATIO
- M. Kozlov, S. Levshakov
- Physics
- 20 September 2010
Quantum-mechanical tunneling inversion transition in ammonia (NH3) is actively used as a sensitive tool to study possible variations of the electron-to-proton mass ratio, μ = m e/m p. The molecule… Expand