Zobrazeno 1 - 10
of 4 026
pro vyhledávání: '"Ulrich, K."'
We study the interactions and the conditions for the equilibrium of forces between generic non-rotating black holes of the Einstein-Maxwell-Dilaton (EMD) theory. We study known (and some new) solutions of the time-symmetric initial-data problem escri
Externí odkaz:
http://arxiv.org/abs/2408.04621
Autor:
Ishikawa, Hajime, Ishii, Yuto, Yajima, Takeshi, Matsuda, Yasuhiro H., Kindo, Koichi, Shimizu, Yusei, Rousochatzakis, Ioannis, Rößler, Ulrich K., Janson, Oleg
Publikováno v:
Phys. Rev. B 109, L180401 (2024)
We study the magnetism of a layered, spin-$\frac12$ organic-inorganic copper sulfate, which is a close realization of the star lattice antiferromagnet, one of the playgrounds of geometric frustration and resonating valence bond physics in two spatial
Externí odkaz:
http://arxiv.org/abs/2404.06783
In the context of ghost-free infinite derivative gravity we consider the single graviton exchange either between two spinless particles or between a spinless particle and a photon. To this end, we compute the gravitational potential for both cases an
Externí odkaz:
http://arxiv.org/abs/2402.18694
We show, using three empirical applications, that linear regression estimates which rely on the assumption of sparsity are fragile in two ways. First, we document that different choices of the regressor matrix that do not impact ordinary least square
Externí odkaz:
http://arxiv.org/abs/2311.02299
Publikováno v:
Class. Quantum Grav. 40 175009 (2023); Corrigendum: Class. Quantum Grav. 40 249503 (2023)
We construct a numerical relativity code based on the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation for the gravitational quadratic $f(R)$ Starobinsky model. By removing the assumption that the determinant of the conformal 3-metric is unity,
Externí odkaz:
http://arxiv.org/abs/2304.03794
Publikováno v:
Phys. Rev. D 107, 124036 (2023)
We examine the quantum gravitational entanglement of two test masses in the context of linearized General Relativity with specific non-local interaction with matter. To accomplish this, we consider an energy-momentum tensor describing two test partic
Externí odkaz:
http://arxiv.org/abs/2303.17640
Undoped cuprates are an abundant class of magnetic insulators, in which the synergy of rich chemistry and sizable quantum fluctuations leads to a variety of magnetic behaviors. Understanding the magnetism of these materials is impossible without the
Externí odkaz:
http://arxiv.org/abs/2303.14033
Publikováno v:
Nat. Commun. 14, 5218 (2023)
The valence electronic structure of magnetic centers is one of the factors that determines the characteristics of a magnet. It may refer to orbital degeneracy, as for $j_\text{eff}=1/2$ Kitaev magnets, or near-degeneracy, e.g. involving the third and
Externí odkaz:
http://arxiv.org/abs/2301.03392
Publikováno v:
Commun. Phys. 5, 214 (2022)
The notion of strong electronic correlations arose in the context of $d$-metal oxides such as NiO but can be exemplified on systems as simple as the H$_2$ molecule. Here we shed light on correlation effects on B$_6^{2-}$ clusters as found in $M$B$_6$
Externí odkaz:
http://arxiv.org/abs/2211.05571