Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Dzuba, Vladimir A."'
Autor:
Webb, John K., Lee, Chung-Chi, Milaković, Dinko, Dougan, Darren, Dzuba, Vladimir A., Flambaum, Victor V.
Detecting or placing upper limits on spacetime variations of fundamental constants requires quantifying every potential source of uncertainty. We continue our previous study into the impact of continuum variations on measurements of the fine structur
Externí odkaz:
http://arxiv.org/abs/2410.00684
Autor:
Lee, Chung-Chi, Webb, John K., Dougan, Darren, Dzuba, Vladimir A., Flambaum, Victor V., Milaković, Dinko
Searches for variations of fundamental constants require a comprehensive understanding of measurement errors. This paper examines a source of error that is usually overlooked: the impact of continuum placement error. We investigate the problem using
Externí odkaz:
http://arxiv.org/abs/2410.01849
Autor:
Webb, John K., Lee, Chung-Chi, Milakovic, Dinko, Flambum, Victor V., Dzuba, Vladimir A., Magueijo, Joao
We report unbiased AI measurements of the fine structure constant alpha in two proximate absorption regions in the spectrum of the quasar HE0515-4414. The data are high resolution, high signal to noise, and laser frequency comb calibrated, obtained u
Externí odkaz:
http://arxiv.org/abs/2401.00888
Searches for variations of fundamental constants require accurate measurement errors. There are several potential sources of errors and quantifying each one accurately is essential. This paper addresses one source of uncertainty relating to measuring
Externí odkaz:
http://arxiv.org/abs/2212.00434
Autor:
Lee, Chung-Chi, Webb, John K., Carswell, Robert F., Dzuba, Vladimir A., Flambaum, Victor V., Milaković, Dinko
The high resolution spectrograph ESPRESSO on the VLT allows measurements of fundamental constants at unprecedented precision and hence enables tests for spacetime variations predicted by some theories. In a series of recent papers, we developed optim
Externí odkaz:
http://arxiv.org/abs/2212.00791
Autor:
Murphy, Michael T., Berke, Daniel A., Liu, Fan, Flynn, Chris, Lehmann, Christian, Dzuba, Vladimir A., Flambaum, Victor V.
The fine structure constant, $\alpha$, sets the strength of the electromagnetic force. The Standard Model of particle physics provides no explanation for its value, which could potentially vary. The wavelengths of stellar absorption lines depend on $
Externí odkaz:
http://arxiv.org/abs/2211.05150
Publikováno v:
Phys. Rev. Lett. 125, 173002 (2020)
We identify Ba$^{4+}$ (Te-like) as a promising candidate for a high-accuracy optical clock. The lowest-lying electronic states are part of a $^3P_J$ fine structure manifold with anomalous energy ordering, being non-monotonic in $J$. We propose a cloc
Externí odkaz:
http://arxiv.org/abs/2010.12477
Autor:
Li, Jiguang, Dzuba, Vladimir
Using recently developed version of the configuration interaction method for atoms with open shells we calculate electron structure and spectroscopic properties of the mendelevium atom (Md, $Z=101$). These include energy levels, first and second ioni
Externí odkaz:
http://arxiv.org/abs/2002.08033
Autor:
Dzuba, Vladimir A., Derevianko, Andrei
Publikováno v:
J. Phys. B 52, 215005 (2019)
Black-body radiation (BBR) shifts of $^3\!P_0-^1\!S_0$ clock transition in divalent atoms Cd and Zn are evaluated using accurate relativistic many-body techniques of atomic structure. Static polarizabilities of the clock levels and relevant electric-
Externí odkaz:
http://arxiv.org/abs/1906.07853
Publikováno v:
Phys. Rev. A 98, 042512 (2018)
We calculate the spectrum and allowed E1 transitions of the superheavy element Og (Z=118). A combination of configuration interaction (CI) and perturbation theory (PT) is used (Dzuba \textit{et at.} Phys. Rev. A, \textbf{95}, 012503 (2017)). The spec
Externí odkaz:
http://arxiv.org/abs/1809.02325