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86 papers · 1 filter
The baryon acoustic oscillation peak: a flexible standard ruler
Boudewijn F. Roukema
For about a decade, the baryon acoustic oscillation (BAO) peak at about 105 Mpc/h has provided a standard ruler test of the LCDM cosmological model, a member of the Friedmann--Lema…
Oracle inequalities for ranking and U-processes with Lasso penalty
Wojciech Rejchel
We investigate properties of estimators obtained by minimization of U-processes with the Lasso penalty in high-dimensional settings. Our attention is focused on the ranking problem…
On the Green and Wald formalism
Jan J. Ostrowski, Boudewijn F. Roukema
Backreaction in the cosmological context is a longstanding problem that is especially important in the present era of precise cosmology. The standard model of a homogeneous backgro…
Absolute measurement of the - clock transition in neutral Sr over the 330 km-long stabilized fibre optic link
Piotr Morzynski, Marcin Bober, Dobroslawa Bartoszek-Bober +14
We report a stability below of two independent optical lattice clocks operating with bosonic Sr isotope. The value (429228066418008.3(1.9)(…
Sufficient separability criteria and linear maps
Maciej Lewenstein, Remigiusz Augusiak, Dariusz Chruściński +2
We study families of positive and completely positive maps acting on a bipartite system (with ). The maps have a property that when appl…
Observational Challenges for the Standard FLRW Model
Thomas Buchert, Alan A. Coley, Hagen Kleinert +2
We summarise some of the main observational challenges for the standard Friedmann-Lemaitre-Robertson-Walker cosmological model and describe how results recently presented in the pa…