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This thesis develops two exciting areas of particle physics research. It applies the recent new insights about the usefulness of helicity amplitudes in understanding gauge theory to the long-standing effort to understand theories with both electric and magnetic charges. It is known that for some supersymmetric theories there is an exact duality that relates two descriptions of the physics, one where the electric charges are weakly coupled and another where the electric charges are strongly coupled. The calculations in this thesis suggest that this duality can also hold in the low-energy limit of nonsupersymmetric gauge theories. The idea of addressing the hierarchy problem of the standard model Higgs mechanism using conformal symmetry is also explored. Analogously to “Little Higgs” models, where divergences are cancelled only at one-loop order, models are studied that have infrared conformal fixed points which related gauge and Yukawa couplings, allowing for a cancellation between seemingly unrelated quantum loop diagrams.

Physics. --- Mathematical physics. --- Quantum physics. --- Elementary particles (Physics). --- Quantum field theory. --- Atomic structure. --- Molecular structure. --- Spectra. --- Elementary Particles, Quantum Field Theory. --- Quantum Physics. --- Mathematical Physics. --- Atomic/Molecular Structure and Spectra. --- Symmetry (Physics) --- Particles (Nuclear physics) --- Helicity. --- Charged particle helicity --- Helicity (Nuclear physics) --- Nuclear spin --- Quantum theory --- Invariance principles (Physics) --- Symmetry (Chemistry) --- Conservation laws (Physics) --- Physics --- Quantum theory. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Thermodynamics --- Atomic structure  . --- Molecular structure . --- Structure, Atomic --- Atomic theory --- Physical mathematics --- Relativistic quantum field theory --- Field theory (Physics) --- Relativity (Physics) --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Nuclear physics --- Structure, Molecular --- Chemical structure --- Structural bioinformatics --- Mathematics

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Electromagnetism plays a crucial role in basic and applied physics research. The discovery of electromagnetism as the unifying theory for electricity and magnetism represents a cornerstone in modern physics. Symmetry was crucial to the concept of unification: electromagnetism was soon formulated as a gauge theory in which local phase symmetry explained its mathematical formulation. This early connection between symmetry and electromagnetism shows that a symmetry-based approach to many electromagnetic phenomena is recurrent, even today. Moreover, many recent technological advances are based on the control of electromagnetic radiation in nearly all its spectra and scales, the manipulation of matter–radiation interactions with unprecedented levels of sophistication, or new generations of electromagnetic materials. This is a fertile field for applications and for basic understanding in which symmetry, as in the past, bridges apparently unrelated phenomena―from condensed matter to high-energy physics. In this book, we present modern contributions in which symmetry proves its value as a key tool. From dual-symmetry electrodynamics to applications to sustainable smart buildings, or magnetocardiography, we can find a plentiful crop, full of exciting examples of modern approaches to electromagnetism. In all cases, symmetry sheds light on the theoretical and applied works presented in this book.

electromagnetic knots --- helicity --- spin-orbital momentum --- magnetocardiography --- quadratic penalty --- variational mode decomposition --- correlation coefficient --- interval thresholding method --- periodic structures --- dispersion diagram --- high-order coupling --- glide symmetry --- smart building --- harmonics --- geometric algebra --- Poynting Multivector --- electric-magnetic duality symmetry --- quantum anomalies --- optical helicity --- electromagnetic polarization --- particle creation --- Maxwell theory --- constraint equations --- evolutionary equations --- Barium hexaferrite --- titanium --- hysteresis --- X-ray diffraction --- permanent magnet applications --- n/a --- hopfion --- Bateman construction --- null fields --- magnetic levitation --- electrodynamic structure --- ground high speed system --- finite element analysis --- non-local action --- electrodynamics --- electromagnetic duality symmetry --- Aharonov-Bohm effect --- Harvesting --- low-power applications --- vibration --- micro-generator --- optimal solution --- magnetic circuit --- periodical structure --- effective power density --- symmetry

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Particle or Wave is the first popular-level book to explain the origins and development of modern physical concepts about matter and the controversies surrounding them. The dichotomy between particle and wave reflects a dispute--whether the universe's most elementary building blocks are discrete or continuous in nature--originating in antiquity when philosophers first speculated about the makeup of the physical world. Charis Anastopoulos examines two of the earliest known theories about matter--the atomic theory, which attributed all physical phenomena to atoms and their motion in the void, and the theory of the elements, which described matter as consisting of the substances earth, air, fire, and water. He then leads readers up through the ages to the very frontiers of modern physics to reveal how these seemingly contradictory ideas still lie at the heart of today's continuing debates. Anastopoulos explores the revolutionary contributions of thinkers like Nicolas Copernicus, Isaac Newton, and Albert Einstein. He shows how Einstein's ideas about relativity unify opposing concepts by identifying matter with energy, and how quantum mechanics goes even further by postulating the coexistence of the particle and the wave descriptions. Anastopoulos surveys the latest advances in physics on the fundamental structure of matter, including the theories of quantum fields and elementary particles, and new cutting-edge ideas about the unification of all forces. This book reveals how the apparent contradictions of particle and wave reflect very different ways of understanding the physical world, and how they are pushing modern science to the threshold of new discoveries.

SCIENCE / Physics / Quantum Theory. --- Matter. --- Physics --- Atoms --- Dynamics --- Gravitation --- Substance (Philosophy) --- History --- Copenhagen interpretation. --- Cosmotron. --- Democritus. --- Eightfold Way. --- absolute space. --- absolute time. --- alpha particles. --- analytic geometry. --- angular momentum. --- asymptotic freedom. --- baryon number. --- black body radiation. --- bosons. --- cathode rays. --- classical physics. --- contact interactions. --- determinism. --- dynamism. --- electric charge. --- empiricism. --- entanglement. --- epicycles. --- exclusion principle. --- fermions. --- fluid mechanics. --- four-vectors. --- gamma particles. --- general relativity. --- geometric optics. --- grand unified theory. --- hadrons. --- helicity. --- inertia. --- initial conditions. --- kinematics. --- kinetic theory. --- laws of motion. --- lepton number. --- locality. --- massive particles. --- mechanicism. --- molecules. --- nuclear force. --- nucleus. --- observables. --- periodic table. --- perturbation theory. --- positivism. --- positrons. --- qualities in physics. --- reference frames. --- regularization.

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The essential introduction to magnetic reconnection—written by a leading pioneer of the fieldPlasmas comprise more than 99 percent of the visible universe; and, wherever plasmas are, magnetic reconnection occurs. In this common and yet incompletely understood physical process, oppositely directed magnetic fields in a plasma meet, break, and then reconnect, converting the huge amounts of energy stored in magnetic fields into kinetic and thermal energy. In Magnetic Reconnection, Masaaki Yamada offers an illuminating synthesis of modern research and advances on this important topic. Magnetic reconnection produces such phenomena as solar flares and the northern lights, and occurs in nuclear fusion devices. A better understanding of this crucial cosmic activity is essential to comprehending the universe and varied technological applications, such as satellite communications. Most of our knowledge of magnetic reconnection comes from theoretical and computational models and laboratory experiments, but space missions launched in recent years have added up-close observation and measurements to researchers’ tools. Describing the fundamental physics of magnetic reconnection, Yamada connects the theory with the latest results from laboratory experiments and space-based observations, including the Magnetic Reconnection Experiment (MRX) and the Magnetospheric Multiscale (MMS) Mission. He concludes by considering outstanding problems and laying out a road map for future research.Aimed at advanced graduate students and researchers in plasma astrophysics, solar physics, and space physics, Magnetic Reconnection provides cutting-edge information vital area of scientific investigation.

Magnetic reconnection. --- SCIENCE / Physics / Magnetism. --- Acceleration. --- Accretion disk. --- Ampere. --- Annihilation. --- Astrophysical plasma. --- Astrophysics. --- Bremsstrahlung. --- Collision frequency. --- Collisionality. --- Coronal loop. --- Coronal mass ejection. --- Coulomb collision. --- Current density. --- Current sheet. --- Cyclotron. --- Debye length. --- Diffusion layer. --- Dissipation. --- Drift velocity. --- Dynamo theory. --- Electric field. --- Electrical resistivity and conductivity. --- Electron temperature. --- Electrostatics. --- Energy transformation. --- Experimental physics. --- Fermi acceleration. --- Feynman diagram. --- Field effect (semiconductor). --- Field line. --- Fine structure. --- Flux tube. --- Fusion power. --- Gauge theory. --- Gyroradius. --- Hall effect. --- Inductance. --- Induction equation. --- Instability. --- Interferometry. --- Ion acoustic wave. --- Ionization. --- Kinetic theory of gases. --- Kink instability. --- Landau damping. --- Langmuir probe. --- Length scale. --- Lorentz force. --- Madison Symmetric Torus. --- Magnetar. --- Magnetic confinement fusion. --- Magnetic diffusivity. --- Magnetic dipole. --- Magnetic energy. --- Magnetic field. --- Magnetic flux. --- Magnetic helicity. --- Magnetization. --- Magnetohydrodynamics. --- Magnetopause. --- Magnetosheath. --- Magnetosonic wave. --- Magnetosphere. --- Maxwell–Boltzmann distribution. --- Mean free path. --- Momentum transfer. --- Neutral beam injection. --- Nonlinear optics. --- Nuclear fusion. --- Paramagnetism. --- Particle physics. --- Pitch angle (particle motion). --- Plasma (physics). --- Plasma acceleration. --- Plasma oscillation. --- Plasma parameter. --- Plasma parameters. --- Plasma stability. --- Plasmoid. --- Quadrupole. --- Relativistic plasma. --- Reversed field pinch. --- Safety factor (plasma physics). --- Scattering. --- Skin effect. --- Solar flare. --- Spacecraft. --- Spatial scale. --- Spheromak. --- Stark effect. --- Substorm. --- Synchrotron radiation. --- Thermodynamic equilibrium. --- Thomson scattering. --- Tokamak. --- Two-dimensional space. --- Van Allen radiation belt. --- Weibel instability. --- X-ray. --- Annihilation, Magnetic field --- Magnetic field annihilation --- Magnetic field line merging --- Merging, Magnetic field line --- Reconnection, Magnetic --- Reconnection (Astronomy) --- Astrophysics --- Geophysics --- Magnetic fields