A5065622024- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Quantum Electrodynamics and Casimir Effect
- Orbital Angular Momentum in Optics
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum chaos and dynamical systems
- Astrophysics and Cosmic Phenomena
- Optical Polarization and Ellipsometry
- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Quantum Mechanics and Applications
- Neutrino Physics Research
- Quantum and Classical Electrodynamics
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Molecular spectroscopy and chirality
- Gas Dynamics and Kinetic Theory
- Plant Reproductive Biology
- High-pressure geophysics and materials
- Fluid Dynamics and Turbulent Flows
- Computational Physics and Python Applications
- Nonlinear Waves and Solitons
University of Arizona
2018-2024
Helmholtz-Zentrum Dresden-Rossendorf
2023-2024
City College of New York
2011-2012
The first experimental demonstration of a new Pancharatnam-Berry phase for light beams with spatially inhomogeneous, or vector, states polarization referred to as the higher-order is presented. This geometric proportional light's total angular momentum, sum spin and higher dimensional orbital sharply contrasting well-known associated plane wave state homogeneous beam. directly related rotational symmetry vortex-bearing electromagnetic field, frequency shift beam, has implications in quantum...
Abstract Quantum field theory predicts a nonlinear response of the vacuum to strong electromagnetic fields macroscopic extent. This fundamental tenet has remained experimentally challenging and is yet be tested in laboratory. A particularly distinct signature resulting optical activity quantum birefringence. offers an excellent opportunity for precision test electrodynamics uncharted parameter regime. Recently, operation high-intensity Relativistic Laser at X-ray Free Electron provided by...
We consider birefringent (i.e., polarization changing) scattering of x-ray photons at the superposition two optical laser beams ultrahigh intensity and study resonant contributions axions or axionlike particles, which could also be short lived. Applying specifications Helmholtz International Beamline for Extreme Fields (HIBEF), we find that this setup can more sensitive than previous light-by-light (birefringence) light-shining-through-wall experiments in a certain domain parameter space. By...
We modify action in an external electromagnetic field to include effects of virtual axion-like particle (ALP) excitations. A measurable addition QED-Euler-Heisenberg-Schwinger (EHS) is obtained and incorporated into experimental constraints placed on ALP mass coupling two photons. The regime these which the vacuum effect surpasses EHS characterized. show that probing offers alternative method search for physics related ALPs.
We implement a longstanding proposal by Weisskopf to apply virtual polarization corrections the in/out external fields in study of Euler–Heisenberg–Schwinger effective action. Our approach requires distinguishing electromagnetic and based on mathematical tools developed Białynicki-Birula, originally for Born–Infeld solution is expressed as differential equation where one-loop action serves input. As first result our approach, we recover higher order one-cut reducible loop diagrams discovered...
We offer a 2nd look at the recently claimed improvement of Euler-Heisenberg-Schwinger (EHS) action [PRL \textbf{122} (2019) no.21, 211602 and post-publication correction]: demonstrate difference to concordance with Schwinger-Dyson series starting two-loop level.
We propose an external field approach to evaluating effective action allowing the interaction act everywhere at all times (everlasting). Requiring that asymptotic gauge fields are always interacting, we implement displacement encoding polarization corrections into derivation of action. The result is a novel summation for one-cut reducible loop diagrams, which can be applied two cases: transient quasiconstant electromagnetic and everlasting interactions. In first case, perturbative expansion...
We experimentally investigate Raman optical activity in the scattering of light with spin and orbital angular momentum. Varying combinations momentum light, associated circular polarization helical phase structure Laguerre-Gaussian modes, respectively, are generated by transforming a cylindrical vector beam into polarized mode. back scattered propagating along optic axis c-cut uniaxial birefringent quartz sample is collected spectrometer. The resulting Stokes shifted spectra analyzed...
Interaction of magnetic moment point particles with external electromagnetic fields experiences unresolved theoretical and experimental discrepancies. In this work we out several issues within the relativistic quantum mechanics QED describe effects related to a new covariant classical model dynamics. Using framework explore invariant acceleration experienced by neutral coupled an plane wave field through moment: study case ultra Dirac neutrinos in range $10^{-11}$ $10^{-20}$...
Using the external-field method, i.e., evaluating effective action ${V}_{\mathrm{eff}}$ for an arbitrarily strong constant and homogeneous field, we explore nonperturbative properties of QED allowing arbitrary gyromagnetic ratio $g$. We find a cusp at $g=2$ in (a) The ${b}_{0}$-renormalization group coefficient, infinite-wavelength limit (b) subclass containing pseudoscalar...
An analytical result for Euler-Heisenberg effective action, valid electron spin $g\ensuremath{-}$factor $|g|<2$, was extended to the domain $|g|>2$ via discovered periodicity of action. This allows a simplified computation vacuum instability modified by electron's measured $g=2.002319$. We find strong suppression decay into positron pairs when magnetic fields are dominant. The is reminiscent mass catalysis fields.
We study the interaction between axions and nuclei by combining Peccei-Quinn mechanism with results from quantum chromo-dynamics (QCD) which imply that QCD condensates are reduced within nuclear matter. Thus, effective axion mass is also reduced, yielding a finite axion-nucleon scattering cross section. Even in absence of real axions, this would manifest itself Casimir type attraction two nuclei. Finally, accelerated can create entangled pairs via dynamical effect (or as signatures Unruh effect).
Quantum field theory predicts a nonlinear response of the vacuum to strong electromagnetic fields macroscopic extent. This fundamental tenet has remained experimentally challenging and is yet be tested in laboratory. A particularly distinct signature resulting optical activity quantum birefringence. offers an excellent opportunity for precision test electrodynamics uncharted parameter regime. Recently, operation high-intensity laser ReLaX provided by Helmholtz International Beamline Extreme...
We evaluate for the inhomogeneous static electric Sauter step potential imaginary part of emerging homogeneous in field effective Euler-Heisenberg-Schwinger action sourced by vacuum fluctuations a charged particle with magnetic moment arbitrary strength. The result is convergent all values gyromagnetic ratio $g$, periodic cusp at $g=2$. consider relation to QED beta-function which also found be $g$. confirm presence asymptotic freedom conditions using this novel method and document wider...
We study the response of electron mass to an externally applied electrical field. As a consequence nonlinear electromagnetic (EM) effective action, particle diminishes in presence electric consider modification muon anomalous magnetic moment $g\ensuremath{-}2$ due loop insert higher order. Since virtual pair is close proximity muon, it experiences strong field phenomena. show that current theory-experiment discrepancy could originate (virtual) nonperturbative by EM The magnitude can be also...
We experimentally demonstrate the generation of a class spatially variant polarization beams called hybrid vector beams. Hybrid have cylindrically symmetric amplitude and varying degree ellipticity in their transverse profile about beam axes, from linear to elliptical circular every 45 degrees. describe method for various polarizations based on transformation cylindrical using conventional wave plates. The Stokes parameters overall each generated are measured mapped numerically.
We consider birefringent (i.e., polarization changing) scattering of x-ray photons at the superposition two optical laser beams ultra-high intensity and study resonant contributions axions or axion-like particles, which could also be short-lived. Applying specifications Helmholtz International Beamline for Extreme Fields (HIBEF), we find that this set-up can more sensitive than previous light-by-light (birefringence) light-shining-through-wall experiments in a certain domain parameter space....
We propose an external field approach to evaluating effective action allowing the interaction act everywhere at all times (everlasting). Requiring that asymptotic gauge fields are always-interacting, we implement displacement encoding polarization corrections into derivation of action. The result is a novel summation for one-cut reducible loop diagrams, which can be applied two cases: transient quasi-constant electromagnetic fields, and everlasting interactions. In first case, perturbative...
Employing the Bogoliubov coefficient summation method and introducing gyromagnetic ratio $g\neq 2$ we derive an explicit functional form of $\mathfrak{Im}V^\mathrm{EHS}_g$, imaginary part Euler-Heisenberg-Schwinger (EHS) type effective action. We show that $\mathfrak{Im}V^\mathrm{EHS}_g$ is periodic in $g$ for any (quasi-)constant electromagnetic field configuration, equal to obtained using a Ramanujan integrand proper time representation $V^\mathrm{EHS}_g$. This validates $V^\mathrm{EHS}_g$...
Using the external field method, {\it i.e.\/} evaluating effective action $V_{\mathrm{eff}}$ for an arbitrarily strong constant and homogeneous field, we explore nonperturbative properties of QED allowing arbitrary gyromagnetic ratio $g$. We find a cusp at $g = 2$ in: a) The $b_0$-renormalization group coefficient, in infinite wavelength limit b) subclass containing pseudoscalar ${\cal P}^{2n}= (\vec E\cdot\vec B)^{2n} $ light-light scattering coefficients. Properties $b_0$ imply certain...