258 citations · 2.1k across the 69 of their papers we have counts for
72 papers
Fundamental physical constants at low and high redshifts
S. A. Levshakov
Spacetime variations of physical constants can be associated with the existence of Higgs-like scalar field(s) that couple non-universally to the baryonic matter. Recent results of…
Constraints on the electron-to-proton mass ratio variation at the epoch of reionization
S. A. Levshakov, M. G. Kozlov, I. I. Agafonova
Far infrared fine-structure transitions of CI and CII and rotational transitions of CO are used to probe hypothetical variations of the electron-to-proton mass ratio mu = m_e/m_p a…
36 GHz methanol lines from nearby galaxies: maser or quasi-thermal emission?
P. Humire, C. Henkel, Y. Gong +12
Methanol (CH3OH) is one of the most abundant interstellar molecules, offering a vast number of transitions to be studied, including many maser lines. While the strongest Galactic C…
ALMA view of the C/C isotopic ratio in starburst galaxies
X. D. Tang, C. Henkel, K. M. Menten +16
We derive molecular-gas-phase C/C isotope ratios for the central few 100 pc of the three nearby starburst galaxies NGC 253, NGC 1068, and NGC 4945 making use of the $…
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
S. A. Levshakov, K. -W. Ng, C. Henkel +4
Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or c…
Testing the variability of the proton-to-electron mass ratio from observations of methanol in the dark cloud core L1498
M. Daprà, C. Henkel, S. A. Levshakov +6
The dependence of the proton-to-electron mass ratio, mu, on the local matter density was investigated using methanol emission in the dense dark cloud core L1498. Towards two differ…