A5102000312- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Quantum, superfluid, helium dynamics
- Geophysics and Gravity Measurements
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Noncommutative and Quantum Gravity Theories
- Opinion Dynamics and Social Influence
- Nonlinear Photonic Systems
- Nonlinear Waves and Solitons
- Pulsars and Gravitational Waves Research
- Quantum Electrodynamics and Casimir Effect
- Advanced Thermodynamics and Statistical Mechanics
- Physics of Superconductivity and Magnetism
- Relativity and Gravitational Theory
- Mechanical and Optical Resonators
- Dark Matter and Cosmic Phenomena
TU Wien
1998-2019
Peter the Great St. Petersburg Polytechnic University
2006
We analyze the nonrelativistic approximation of Dirac equation for slow fermions, having small kinetic energies compared to their rest energy $m$ and moving in spacetimes with a static metric, caused by weak gravitational field Earth chameleon field, derive most general effective potential order $1/m$, induced metric spacetime excluding possible rotations coordinate frame. The derivation Hamilton operator is carried out using standard Foldy--Wouthuysen transformation. discuss as source...
Recent theoretical work has shown that spin $1/2$ particles moving through unpolarized matter which sources torsion fields experience a new type of parity-even and time-reversal-odd optical potential if the is spinning in lab frame. This can be sought experimentally using helicity dependence total cross sections for longitudinally polarized neutrons rotating cylindrical target. In combination with recent experimental constraints on short-range P--odd, T--even interactions derived from...
We analyse the Lorentz structure of matrix elements transitions "neutron <-->proton", induced by charged hadronic vector current. show that term maintaining conservation current even for different masses neutron and proton (see T. Leitner et al., Phys. Rev. C 73, 065502 (2006) A. M. Ankowski, arXiv:1601.06169 [hep-ph]) has a dynamical origin, related to G-even first class contribution. because invariance strong low-energy interactions under G-parity transformations, G-odd contribution with...
Ultracold neutrons (UCNs) are formidable probes in precision tests of gravity. With their negligible electric charge, dielectric moment, and polarizability they naturally evade some the problems plaguing gravity experiments with atomic or macroscopic test bodies. Taking advantage this fact, q B ounce collaboration has developed a technique – resonance spectroscopy (GRS) to study bound quantum states UCN field Earth. This is used as high-precision tool search for hypothetical Non-Newtonian on...
We analyse different approaches to the description of quantum field theory a free massless (pseudo)scalar defined in 1+1-dimensional space-time which describes bosonized version Thirring model. These are (i) axiomatic theory, (ii) current algebra and (iii) path-integral. show that on class Schwartz's test functions S_0(R^2) connects all these approaches. This is well-defined within framework Wightman's axioms positive definiteness condition. The physical meaning definition observables from...
We analyse the renormalizability of sine-Gordon model using two-point causal Green function. show that all divergences can be removed by renormalization dimensional coupling constant Z1, calculated in Faber and Ivanov (2003 J. Phys. A: Math. Gen. 36 7839) within path-integral approach. calculate Gell-Mann–Low function solve Callan–Symanzik equation for Gaussian fluctuations around a soliton. soliton solution are renormalized like quantum trivial vacuum do not introduce any singularity to at...
The evidence for the observation of Higgs spin-0-boson as a manifestation scalar field provides missing corner stone standard model particles (SM). However, SM fails to explain non-visible but gravitationally active part universe. Its nature is unknown confirmation giving boost scalar-field-theories. So far gravity experiments and observations performed at different distances find no deviation from Newton's law. Therefore dark energy must possess screening mechanism which suppresses...
We discuss the Ward identity and low-energy theorem for divergence of axial-vector current in massless Thirring model with fermion fields quantized chirally broken phase (Eur. Phys. J. C20, 723 (2001)). The are analysed connection Witten's criterion Goldstone bosons (Nucl. B145, 110 (1978)). show that free (pseudo)scalar field bosonizing satisfies to interpret quanta this as bosons. As has been shown hep-th/0210104 hep-th/0212226, Goldstone's criterion, non-invariance wave function ground...
We discuss conformal invariance of the massless Thirring model. show that symmetry model is dynamically broken due to constant motion caused by equations motion. This confirms existence chirally phase in (Eur. Phys. J. C20, 723 (2001), which accompanied appearance (pseudo)scalar Goldstone bosons C24, 653 (2002), hep-th/0210104 and hep-th/0305174).
We calculate the most general effective potential for massless Thirring model in dependence of local fields all fermion-antifermion collective excitations. analyse minima this describing different vacua quantum system. confirm existence absolute minimum found EPJC 20, 723 (2001) corresponding to chirally broken phase model. As has been shown is stable under fluctuations.
We analyse Coleman's theorem asserting the absence Goldstone bosons and spontaneously broken continuous symmetry in quantum field theory of a free massless (pseudo)scalar 1+1-dimensional space-time (Comm. Math. Phys. 31, 259 (1973)). confirm that reproduces well-known Wightman's statement about non-existence terms observables defined on test functions from S(R^2). Referring to our results (Eur. J. C 24, 653 (2002)) we argue formulation S_0(R^2) is motivated well by possibility remove...
The partial width of the decay D^*+_s -> D^+_s pi^0 going through violation isotopical symmetry is computed with respect to radiative gamma in effective quark model chiral U(3)xU(3) incorporating Heavy theory (HQET) and Chiral perturbation at level (CHPT)_q. We investigate a sensitivity ratio widths R_0 current s-quark mass corrections find strong dependence.