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Multi-instantons and exact results I: Conjectures, WKB expansions, and instanton interactions
New limits on the drift of fundamental constants from laboratory measurements.
The absolute 1S-2S transition frequency nu(H) in atomic hydrogen is remeasured and separate limits on alpha/alpha=(-0.9+/-2.9) x 10(-15) yr(-1) and the fractional time variation of the ratio of Rb and Cs nuclear magnetic moments mu(Rb)/mu(Cs) equal to (-0.5+/-1.7) provides information on the temporal behavior of the constant of strong interaction.
Multi-instantons and exact results II: Specific cases, higher-order effects, and numerical calculations
Generation of high-energy photons with large orbital angular momentum by compton backscattering.
It is shown that it is possible to produce high-energy twisted photons by Compton backscattering of twisted laser photons off ultrarelativistic electrons by exploiting the photoeffect and pair production off nuclei in previously unexplored experimental regimes.
From Useful Algorithms for Slowly Convergent Series to Physical Predictions Based on Divergent Perturbative Expansions
Compton upconversion of twisted photons: backscattering of particles with non-planar wave functions
Twisted photons are not plane waves, but superpositions of plane waves with a defined projection ℏm of the orbital angular momentum onto the propagation axis (m is integer and may attain values m≫1).…
Multi-instantons and exact results III: Unification of even and odd anharmonic oscillators
Physics of Skiing: The Ideal-Carving Equation and Its Applications
Ideal carving occurs when a snowboarder or skier, equipped with a snowboard or carving skis, describes a perfect carved turn in which the edges of the ski alone, not the ski surface, describe the…
Bremsstrahlung in alpha decay reexamined.
A high-statistics measurement of bremsstrahlung emitted in the alpha decay of (210)Po has been performed, which allows us to follow the photon spectra up to energies of approximately 500 keV and shows a significant interference between the electric dipole and quadrupole contributions.
Hydrogen-deuterium isotope shift: From the 1S-2S-transition frequency to the proton-deuteron charge-radius difference
We analyze and review the theory of the hydrogen-deuterium isotope shift for the $1S$-$2S$ transition, which is one of the most accurately measured isotope shifts in any atomic system, in view of a…