Zobrazeno 1 - 10
of 3 208
pro vyhledávání: '"Nurlan, A."'
In the $U(3) \times U(3)$ quark NJL model, $\tau$ lepton decays with the production of scalar mesons $f_0(\pi,K])$ and neutrinos are studied, where $f_0=f_0(500), f_0(980)$. It is shown that these decays mainly occur via contact channels and channels
Externí odkaz:
http://arxiv.org/abs/2412.11093
Autor:
Abiev, Nurlan
We proved that on every Stiefel manifold $V_2\mathbb{R}^n\cong \operatorname{SO}(n)/\operatorname{SO}(n-2)$ with $n\ge 3$ the normalized Ricci flow preserves the positivity of the Ricci curvature of invariant Riemannian metrics with positive Ricci cu
Externí odkaz:
http://arxiv.org/abs/2412.03170
Graphics Processing Units (GPUs) leverage massive parallelism and large memory bandwidth to support high-performance computing applications, such as multimedia rendering, crypto-mining, deep learning, and natural language processing. These applicatio
Externí odkaz:
http://arxiv.org/abs/2411.05309
The decay widths of $V \to K(\pi) l \bar{\nu}_l $ are calculated within the Nambu--Jona-Lasinio model, where $V=K^*, \rho, \omega, \phi$ and $l=\mu, e$. The results are obtained using the previously fixed model parameters without introducing any arbi
Externí odkaz:
http://arxiv.org/abs/2410.21805
Publikováno v:
Eur. Phys. J. C 84 (2024) 653
We elaborate on nonmetric geometric flow theory and metric-affine gravity with applications in modern cosmology. Two main motivations for our research follow from the facts that 1) cosmological models for $f(Q)$ modified gravity theories, MGTs, are e
Externí odkaz:
http://arxiv.org/abs/2410.03700
Autor:
Abiev, Nurlan
We proved that the normalized Ricci flow does not preserve the positivity of Ricci curvature of Riemannian metrics on every generalized Wallach space with $a_1+a_2+a_3\le 1/2$, in particular on the spaces $\operatorname{SU}(k+l+m)/\operatorname{SU}(k
Externí odkaz:
http://arxiv.org/abs/2409.02570
It is shown that the processes $e^+ e^- \to \pi^+ \pi^-$ and $\tau^- \to \pi^- \pi^0 \nu_\tau$ can be described in a unified approach in satisfactory agreement with experiment using the vector coupling constant $g_{\rho} = 6$. In this case, in additi
Externí odkaz:
http://arxiv.org/abs/2407.07986
In the framework of the $U(3) \times U(3)$ extended Nambu-Jona-Lasinio model, the processes $e^+e^- \to K^+K^-\pi^0$ and $e^+e^- \to K^+K^-\eta$ are described taking into account both ground and first radially excited intermediate meson states. It is
Externí odkaz:
http://arxiv.org/abs/2404.06329
Autor:
Abiev, Nurlan
Sets related to positively curved invariant Riemannian metrics on generalized Wallach spaces are considered. The problem arises in studying of the evolution of such metrics under the normalized Ricci flow equation. For Riemannian metrics of the Walla
Externí odkaz:
http://arxiv.org/abs/2402.11692
Autor:
Abiev, Nurlan
We study the behavior of a three-dimensional dynamical system with respect to some set $S$ given in 3-dimensional euclidian space. Geometrically such a system arises from the normalized Ricci flow on some class of generalized Wallach spaces that can
Externí odkaz:
http://arxiv.org/abs/2312.09706