A5064705639- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Nonlinear Waves and Solitons
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
- Theoretical and Computational Physics
- Advanced Mathematical Physics Problems
- Pulsars and Gravitational Waves Research
- Noncommutative and Quantum Gravity Theories
- Quantum chaos and dynamical systems
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Magnetic properties of thin films
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Nonlinear Photonic Systems
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Algebraic structures and combinatorial models
- Quantum Electrodynamics and Casimir Effect
Henan University
2020-2025
Institute of Contemporary History
2023
University of Lisbon
2021
Keio University
2008-2019
Chinese Academy of Sciences
2015-2018
Institute of Modern Physics
2015-2018
KTH Royal Institute of Technology
2014-2015
Stockholm University
2014-2015
Hebrew University of Jerusalem
2011-2014
Yamagata University
2013
We investigate dark matter candidates emerging in recently proposed technicolor theories. determine the relic density of lightest, neutral, stable technibaryon having imposed weak thermal equilibrium conditions and overall electric neutrality Universe. In addition we consider sphaleron processes that violate baryon, lepton number. Our analysis is performed case a first order electroweak phase transition as well second one. argue that, both cases, new contributes to Finally examine problem...
A fifth force, of technicolor type, responsible for breaking the electroweak theory is an intriguing extension standard model. Recently new theories have been shown to feature walking dynamics a very low number techniflavors and are not ruled out by precision measurements. We identify light degrees freedom construct associated energy effective theories. These can be used study signatures relevant processes in current future experiments. In our technibaryons pseudo Goldstone bosons their...
A major problem in the Skyrme model is that binding energy of skyrmions, which nuclei, too high by an order magnitude. We show most popular solution to this problem, construct models with zero classical energy, still produces large energies when spin included. argue it thus necessary include quantum effects. calculate skyrmions including simple correction, vibrational modes a harmonic approximation. can give physically reasonable results for nucleon numbers N=1-8 thanks remarkable...
We study the symmetry energy (SE), an important quantity in nuclear physics, Witten-Sakai-Sugimoto model and a much simpler hard-wall of holographic QCD. The SE is contribution to nucleus due having unequal number neutrons protons. Using homogeneous Ansatz representing smeared instantons quantizing their isospin, we extract proton fraction assuming charge neutrality beta-equilibrium, using quantization isospin zeromode. also show equivalence between our method adapted from solitons usual way...
We construct the general vortex solution in fully-Higgsed, color-flavor locked vacuum of a non-Abelian gauge theory, where group is taken to be product an arbitrary simple and U(1), with Fayet-Iliopoulos term. The moduli space determined.
Skyrmions of different dimensions are related by domain walls. We obtain explicit full numerical solutions various Skyrmion configurations trapped inside a wall. find for the quadratic mass term that multi-Skyrmions ring shaped and conjecture linear term, lowest-energy state will consist charge-2 rings accommodated in lattice.
We consider the Witten-Sakai-Sugimoto model in approximation of smeared instantons at finite density via a homogeneous ansatz, which is known to be discontinuous order able contain nonvanishing baryon density. The discontinuity infrared tip bulk spacetime gives rise subtleties discarding boundary terms that are normally discarded literature. propose reason for this term, by scrutinizing currents and topological properties model. Along way, we find very effective simple condition compute...
The color-flavor locked phase of high density QCD admits non-Abelian vortices, that are superfluid vortices with confined color-magnetic fluxes. Vortex solutions were thus far constructed in an axially symmetric Ansatz common vortex winding the left- and right-handed diquark condensates. In this paper, we explore without any Ansatz. addition to configurations known before, find axial symmetry is broken certain parameter regions; one case a single split into two chiral i.e. only left or...
A bstract The Skyrme model is extended with the Maxwell action and a source term for gauge field. We consider specialized case of vanishing isospin states, such that only an electric potential turned on study backreaction onto fields. In particular, we Skyrmions baryon numbers B = 4, 8, 12, 16 40. find, in agreement physical expectations, Coulomb most pronounced large find furthermore dynamics theory more sensitive to than ground states (global minimizers energy). Calibrating Carbon-12,...
A bstract We propose a generalization of the theory magnetic Skyrmions in chiral magnets two dimensions to higher-dimensional with three and an S 3 target space, requiring 4-dimensional magnetization vector. physical realization our could be made using synthetic dimension, recently promoted realized condensed matter physics. In simplest incarnation theory, we find Skyrmion sphaleron — latter being unstable soliton. Including also Skyrme term enriches spectrum small metastable Skyrmion, large...
Skyrmions can be transformed into lumps or baby-Skyrmions by being trapped inside a domain wall. Here we find that they also sine-Gordon kinks when confined vortices, resulting in Skyrmions. We show this both an effective field theory approach and direct numerical calculations. The existence of these does not rely on higher-derivative terms the host solitons are flat straight. construct Skyrmion as twisted vortex ring model with sixth-order derivative term.
We study $\mathbb{C}{P}^{2}$ skyrmion crystals in the ferromagnetic $\mathrm{SU}(3)$ Heisenberg model with a generalization of Dzyaloshinskii-Moriya interaction and Zeeman term. The possesses two different types unit skyrmions that can be interpreted as bound states half-skyrmions or four quarter-skyrmions. Our on opens up possibility for useful future applications since have more degrees freedom than usual $\mathbb{C}{P}^{1}$ (magnetic) skyrmions.
We present repeated structural and electrical measurements on individual multiwalled carbon nanotubes, alternating between under ambient conditions transmission electron microscopy (TEM). The nanotubes made by chemical vapor deposition were manipulated onto cantilever electrodes extending from a specially designed microfabricated chip. Repeated TEM investigations then of the progressive destruction nanotube structure induced Joule heating in air. indicate that studied behave as diffusive...
We consider the Skyrme model with addition of extra scalar potentials that decrease classical binding energies Skyrmions to about 3% level---without altering pion mass---if we insist on keeping platonic symmetries are usually possessed by Skyrmions. A side effect under consideration is smaller size 1-Skyrmion resulting in a moment inertia and turn larger spin contribution energy upon semiclassical quantization. After taking into account quantum contributions find total at 6% level.
We study the phase diagram of (large-${N}_{c}$) QCD using a simplistic holographic hard-wall model with dynamical scalar field and homogeneous Ansatz representing smeared instanton/baryon density. The resulting is qualitatively consistent expectations, including mesonic, baryonic, quarkyonic, quark-gluon plasma phase. As in other models, we also find baryonic popcorn transition, which appears at large chemical potential as crossover. then evaluate nuclear matter equation state, turns out to...
A bstract We compare the Hilbert series approach with explicit constructions of higher-order Lagrangians for O( N ) nonlinear sigma model. use to find number and type operators up mass dimension 16, spacetime D 12 12, further classify into parity internal symmetry group ). The construction is done both parities even 10 other three cases. results two methods are in full agreement. This provides evidence conjecture regarding co-closed but not co-exact k -forms, which takes account...
There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce sources of CP violation, and there be mixing between multiple bosons or other scalar bosons. Alternatively, a composite state, even no at all. scenarios have important implications collider as well cosmology, understanding their phenomenology is essential full comprehension electroweak symmetry breaking. This report discusses most relevant theories which go its...
We study a Skyrme-type model with quadratic potential for field $S^2$ vacua. consider two flavors of the model, first is Skyrme and second has sixth-order derivative term instead term; both added potential. The contains molecules half Skyrmions, each them global (anti-)monopole baryon number 1/2. numerically construct solutions numbers one through six, find stable which look like beads on rings. also molecule fractional Skyrmions having 1/3 + 2/3, by adding linear term.
We study a generalization of the loosely bound Skyrme model which consists with sixth-order derivative term---motivated by its fluidlike properties---and second-order potential---motivated lowering classical binding energies higher-charged Skyrmions. use rational map approximation for Skyrmion topological charge $B=4$, calculate energy latter, and estimate systematic error in using this approximation. In parameter space that we can explore within approximation, find as low 1.8%, once taking...
We study the vibrational modes of Skyrmions with baryon numbers one through eight in standard Skyrme model. The are found harmonic approximation around classical soliton solution and real parts frequencies extracted. further classify into representations symmetries possessed by Skyrmion solutions. find that there approximately 7B low-lying for a number B, addition to an infinite continuum scattering modes. This result suggests instanton moduli space, which is 8B-dimensional, does not...
Construction of a supersymmetric extension the Skyrme term was long-standing problem because auxiliary field problem; that is, may propagate and cannot be eliminated, having fourth-order time derivative terms. In this paper, we construct for first in four spacetime dimensions, manifestly superfield formalism does not suffer from problem. Chiral symmetry breaking theories results only Nambu-Goldstone (NG) bosons (pions) but also same number quasi-NG so low-energy theory is described by an...
A supersymmetric extension of the Skyrme model was obtained recently, which consists only term in Nambu-Goldstone (pion) sector complemented by same number quasi-Nambu-Goldstone bosons. Scherk-Schwarz dimensional reduction yields a kinetic three or lower dimensions and potential two dimensions, preserving supersymmetry. Euclidean solitons (instantons) are constructed model. In four soliton is an instanton first found Speight. then performed once to get 3-dimensional theory 3d...