Results 31 to 40 of about 2,730 (156)

A graviton propagator for inflation

, 2007
We construct the scalar and graviton propagator in quasi de Sitter space up to first order in the slow roll parameter $\epsilon\equiv -\dot{H}/H^2$. After a rescaling, the propagators are similar to those in de Sitter space with an $\epsilon$ correction ...
Abramo L R W Brandenberger R H Mukhanov V F M Olinto A V Frieman J A Schramm D N, Birrell N D, Brunier T, Carroll S M, Chernikov N A, Danielsson U H, Grishchuk L P, Grishchuk L P, Higuchi A, Janssen T, Kaloper N, Liddle A R, Miao S P, Mukhanov V, Mukhanov V F, Mukhanov V F, Onemli V K, Penrose R, Prokopec T, Prokopec T Janssen T, Prokopec T Tsamis N C Woodard R P, Starobinsky A A, Starobinsky A A, Tomas Janssen, Tomislav Prokopec, Tsamis N C Woodard R P, Woodard R P, Woodard R P   +27 more
core   +1 more source

Magneto‐Spectroscopy of Interlayer Excitons in Transition‐Metal Dichalcogenide Heterostructures

physica status solidi (b), Volume 262, Issue 3, March 2025.
Combining two different transition‐metal dichalcogenide monolayers can lead to a type‐II band alignment and formation of interlayer excitons (ILE). In diselenide heterobilayers, bright ILE are observable if the interlayer twist angle is close to 0° or 60°.
Johannes Holler, Malte Selig, Dmitry S. Smirnov, Michael Kempf, Jonas Zipfel, Philipp Nagler, Manuel Katzer, Florian Katsch, Mariana V. Ballottin, Anatolie A. Mitioglu, Alexey Chernikov, Peter C. M. Christianen, Christian Schüller, Andreas Knorr, Tobias Korn   +14 more
wiley   +1 more source

On Chernikov-by-nilpotent groups

Let $γ_k=[x_1,\dots,x_k]$ be the $k$-th lower central group-word. Given a group $G$, we write $X_k(G)$ for the set of $γ_k$-values and $γ_k(G)$ for the $k$-th term of the lower central of $G$. This paper deals with groups in which $\langle g^{X_k(G)} \rangle$ is a Chernikov group of size at most $(m,n)$ for all $g\in G$. The main result is that $γ_{k+1}
Capasso, Martina, Lancellotti, Liliana, Shumyatsky, Pavel   +2 more
openaire   +2 more sources

Dynamical Stability and Quantum Chaos of Ions in a Linear Trap

, 1999
The realization of a paradigm chaotic system, namely the harmonically driven oscillator, in the quantum domain using cold trapped ions driven by lasers is theoretically investigated.
A. A. Chernikov, A. A. Chernikov, A. Lichtenberg, B. G. Klappauf, B. G. Klappauf, B. V. Chirikov, B. W. Shore, C. Monroe, C. Monroe, D. F. V. James, D. F. V. James, D. J. Berkeland, D. J. Wineland, D. Leibfried, G. M. Zaslavsky, G. M. Zaslavsky, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. P. Berman, G. V. López, J. E. Bayfield, J. I. Cirac, J. K. Breslin, L. D. Landau, L. E. Reichl, M. Frasca, M. H. Holzscheiter, M. Roberts, M. S. Gulley, P. W. Milonni, R. J. Hughes, R. J. Hughes, S. A. Gardiner   +43 more
core   +1 more source

Formulation of perfect‐crystal diffraction from Takagi–Taupin equations: numerical implementation in the crystalpy library

Journal of Synchrotron Radiation, Volume 31, Issue 6, Page 1469-1480, November 2024.
The Takagi–Taupin equations are solved in their simplest form (zero deformation) and equations of the diffracted and transmitted amplitudes are obtained using a matrix model. The theory presented is coded in the open‐source software package crystalpy.The Takagi–Taupin equations are solved in their simplest form (zero deformation) to obtain the Bragg ...
Jean-Pierre Guigay, Manuel Sanchez del Rio   +1 more
wiley   +1 more source

On certain groups with Chernikov group of automorphisms

Researches in Mathematics, 2014
We obtained automorphic analogue of Schur’s theorem for the case when an arbitrary subgroup A of automorphism group Aut(G) of a group G and the factor-group of a group G modulo A-center are Chernikov groups.
openaire   +1 more source

On nilpotent Chernikov 2-groups with elementary tops

, 2016
We give an explicit description of nilpotent Chernikov 2-groups with elementary tops and the basis of rank 2.
Drozd, Y.A., Plakosh, A.I.
openaire   +3 more sources

On model-theoretic tree properties

, 2016
We study model theoretic tree properties ($\text{TP}, \text{TP}_1, \text{TP}_2$) and their associated cardinal invariants ($\kappa_{\text{cdt}}, \kappa_{\text{sct}}, \kappa_{\text{inp}}$, respectively).
Chernikov, Artem, Ramsey, Nicholas
core   +1 more source

Hard X‐ray imaging and tomography at the Biomedical Imaging and Therapy beamlines of Canadian Light Source

Journal of Synchrotron Radiation, Volume 31, Issue 5, Page 1346-1357, September 2024.
The current state of the Biomedical Imaging and Therapy beamlines of the Canadian Light Source is described and new capabilities are presented.The Biomedical Imaging and Therapy facility of the Canadian Light Source comprises two beamlines, which together cover a wide X‐ray energy range from 13 keV up to 140 keV.
Sergey Gasilov, M. Adam Webb, Arash Panahifar, Ning Zhu, Omar Marinos, Toby Bond, David M. L. Cooper, Dean Chapman   +7 more
wiley   +1 more source

New opportunities for time‐resolved imaging using diffraction‐limited storage rings

Journal of Synchrotron Radiation, Volume 31, Issue 5, Page 1299-1307, September 2024.
The opportunities for time‐resolved X‐ray imaging at diffraction‐limited storage rings are demonstrated by benchmarking time‐resolved 2D and 3D imaging at ForMAX, MAX IV. The enhanced flux density provided by the MAX IV storage ring allows micrometer‐resolution time‐resolved imaging at 2 kHz and 1.1 MHz acquisition rates in 3D and 2D, respectively.The ...
Zisheng Yao, Julia Rogalinski, Eleni Myrto Asimakopoulou, Yuhe Zhang, Korneliya Gordeyeva, Zhaleh Atoufi, Hanna Dierks, Samuel McDonald, Stephen Hall, Jesper Wallentin, Daniel Söderberg, Kim Nygård, Pablo Villanueva-Perez   +12 more
wiley   +1 more source