Zobrazeno 1 - 10
of 1 944
pro vyhledávání: '"Gudnason P"'
We propose a generalization of the theory of magnetic Skyrmions in chiral magnets in two dimensions to a higher-dimensional theory with magnetic Skyrmions in three dimensions and an $S^3$ target space, requiring a 4-dimensional magnetization vector.
Externí odkaz:
http://arxiv.org/abs/2411.12190
The Skyrme model is extended with the Maxwell action and a source term for the gauge field. We consider the specialized case of vanishing isospin states, such that only an electric potential is turned on and study the backreaction onto the Skyrme fie
Externí odkaz:
http://arxiv.org/abs/2410.19618
We study the capture of a magnetic skyrmion into a domain wall (DW) structure in thin films of chirally magnetic type of materials like $[{\rm Pt}({\rm Co/Ni})_M/{\rm Ir}_N]$ and find that in the respective ground states of the DW and the skyrmion, t
Externí odkaz:
http://arxiv.org/abs/2406.19056
Publikováno v:
Phys. Rev. Res. 6, 043162 (2024)
The magnetic Skyrmion is described by one control parameter and one length scale. We study the two extreme limits of the control parameter - infinitely large and vanishing - and find that the magnetic Skyrmion becomes a "restricted" magnetic Skyrmion
Externí odkaz:
http://arxiv.org/abs/2406.03941
Publikováno v:
Phys. Rev. D 110, 026017 (2024)
We discuss how the quark masses and their mass splitting affect the baryons in the Skyrme model as well as the Witten-Sakai-Sugimoto (WSS) model. In both cases baryons are described by solitonic objects, i.e. Skyrmions and instantons, respectively. A
Externí odkaz:
http://arxiv.org/abs/2312.15404
Autor:
Gudnason, Sven Bjarke
Publikováno v:
Phys. Rev. D 109, 125001 (2024)
We consider rigid-body quantization of the Skyrmion in the most general four-derivative generalization of the Skyrme model with a potential giving pions a mass, as well as in a class of higher-order Skyrme models. We quantize the spin and isospin zer
Externí odkaz:
http://arxiv.org/abs/2311.11667
Publikováno v:
Phys. Rev. D 109, 066006 (2024)
We consider the Witten-Sakai-Sugimoto model in the approximation of smeared instantons at finite density via a homogeneous Ansatz, which is known to be discontinuous in order to be able to contain a nonvanishing baryon density. The discontinuity at t
Externí odkaz:
http://arxiv.org/abs/2309.16328
Publikováno v:
JHEP 2311:209, 2023
We utilize the top-down holographic QCD model, the Witten-Sakai-Sugimoto model, in a hybrid setting with the SLy4, soft chiral EFT and stiff chiral EFT equations of state to describe neutron stars with high precision. In particular, we employ a calib
Externí odkaz:
http://arxiv.org/abs/2307.11886
Autor:
Gudnason, Sven Bjarke, Halcrow, Chris
Publikováno v:
Phys. Lett. B 850, 138526 (2024)
A major problem in the Skyrme model is that the binding energy of skyrmions, which model nuclei, is too high by an order of magnitude. We show that the most popular solution to this problem, to construct models with zero classical binding energy, sti
Externí odkaz:
http://arxiv.org/abs/2307.09272
Publikováno v:
J. Phys. A: Math. Theor. 57, 385402 (2024)
The instanton in the Sakai-Sugimoto model corresponds to the Skyrmion on the holographic boundary - which is asymptotically flat - and is fundamentally different from the flat Minkowski space Yang-Mills instanton. We use the Atiyah-Patodi-Singer inde
Externí odkaz:
http://arxiv.org/abs/2306.00677