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Investigation of tantalum films growth for coplanar resonators with internal quality factors above ten million
E. V. Zikiy, N. S. Smirnov, E. A. Krivko, A. R. Matanin, A. I. Ivanov, E. I. Malevannaya, V. I. Polozov, S. V. Bukatin, D. A. Baklykov, I. A. Stepanov, S. A. Kotenkov, S. P. Bychkov, I. A. Ryzhikov, A. V. Andriyash, I. A. Rodionov
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Investigation of tantalum films growth for coplanar resonators with internal quality factors above ten million
Alpha-tantalum on silicon is a promising platform for high-coherence superconducting quantum circuits. However, the growth mechanism of alpha-tantalum on silicon remains poorly understood. We present a comprehensive study on alpha-tantalum films growth on various substrate. The decisive role of a substrate material Debye temperature on phase selection mechanism in tantalum films growth is experimentally confirmed, contradicting the prior assumptions on substrate temperature influence. Crucially…

Inflationary Slow-Roll Parameters in the Jordan Frame for Cosmological F(R) Gravity Models
Vsevolod R. Ivanov
https://arxiv.org/abs/2508.14250 https://arxi…

Inflationary Slow-Roll Parameters in the Jordan Frame for Cosmological F(R) Gravity Models
$F(R)$ inflationary models are analyzed without the Weyl transformation to the Einstein frame. Sufficient conditions for existence of global inflationary attractors in $F(R)$ models are provided. Following that, the procedure for calculating inflationary observables completely in the original, Jordan, frame is given. The described procedure is used to analyze a new $F(R)$ inflationary model (a one-parameter deformation of the Starobinsky model), which is shown to provide predictions in good agr…