Search Results - "Jentschura, Ulrich D"

Dispersion of Ultrarelativistic Tardyonic and Tachyonic Wave Packets on Cosmic Scales by Nicasio, José, Jentschura, Ulrich D.

“…We investigate the time propagation of tachyonic (superluminal) and tardyonic (subluminal, ordinary) massive wave packets on cosmic scales. A normalizable wave…”
Get full text

Quantum Electrodynamics of Dicke States: Resonant One-Photon Exchange Energy and Entangled Decay Rate by Jentschura, Ulrich D., Adhikari, Chandra M.

“…We calculate the fully retarded one-photon exchange interaction potential between electrically neutral, identical atoms, one of which is assumed to be in an…”
Get full text

Long-Range Interactions for Hydrogen Atoms in Excited D States by Adhikari, Chandra M., Jentschura, Ulrich D.

“…Pressure shifts inside an atomic beam are among the more theoretically challenging effects in high-precision measurements of atomic transitions. A crucial…”
Get full text

Multi-instantons and exact results IV: Path integral formalism by Jentschura, Ulrich D., Zinn-Justin, Jean

“…► O(N) anharmonic oscillators are considered in the path integral formalism. ► Higher-order corrections to instantons are obtained using Feynman diagram…”
Get full text

Multi-instantons and exact results III: Unification of even and odd anharmonic oscillators by Jentschura, Ulrich D., Surzhykov, Andrey, Zinn-Justin, Jean

“…This is the third article in a series of three papers on the resonance energy levels of anharmonic oscillators. Whereas the first two papers mainly dealt with…”
Get full text

Lepton Pair Čerenkov Radiation Emitted by Tachyonic Neutrinos: Lorentz-Covariant Approach and IceCube Data by Jentschura, Ulrich D., Ehrlich, Robert

“…Current experiments do not exclude the possibility that one or more neutrinos are very slightly superluminal or that they have a very small tachyonic mass…”
Get full text

Neutrino Pair Cerenkov Radiation for Tachyonic Neutrinos by Jentschura, Ulrich D., Nándori, István

“…The emission of a charged light lepton pair by a superluminal neutrino has been identified as a major factor in the energy loss of highly energetic neutrinos…”
Get full text

Magic Wavelengths for 1S–nS and 2S–nS Transitions in Hydrogenlike Systems by Adhikari, Chandra M., Canales, Jonathan C., Arthanayaka, Thusitha P. W., Jentschura, Ulrich D.

“…We study the magic wavelength for two-photon 1S–nS transitions in a hydrogen and deuterium atom, as well as 2S–nS transitions, where the lower level is the…”
Get full text

Long-Range Interactions for Hydrogen: 6P–1S and 6P–2S Systems by Jentschura, Ulrich, Adhikari, Chandra

“…The collisional shift of a transition constitutes an important systematic effect in high-precision spectroscopy. Accurate values for van der Waals interaction…”
Get full text

Calculation of the characteristic functions of anharmonic oscillators by Jentschura, Ulrich D., Zinn-Justin, Jean

“…The energy levels of quantum systems are determined by quantization conditions. For one-dimensional anharmonic oscillators, one can transform the Schrödinger…”
Get full text

Squeezing the Parameter Space for Lorentz Violation in the Neutrino Sector with Additional Decay Channels by Jentschura, Ulrich D.

“…The hypothesis of Lorentz violation in the neutrino sector has intrigued scientists for the last two to three decades. A number of theoretical arguments…”
Get full text

Antimatter Gravity: Second Quantization and Lagrangian Formalism by Jentschura, Ulrich D.

“…The application of the CPT (charge-conjugation, parity, and time reversal) theorem to an apple falling on Earth leads to the description of an anti-apple…”
Get full text

Precision measurement of the hydrogen-deuterium 1S-2S isotope shift by Parthey, Christian G, Matveev, Arthur, Alnis, Janis, Pohl, Randolf, Udem, Thomas, Jentschura, Ulrich D, Kolachevsky, Nikolai, Hänsch, Theodor W

“…Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670,994,334,606(15) Hz. This is a 10-times…”
Get full text

Triple Compton effect: a photon splitting into three upon collision with a free electron by Lötstedt, Erik, Jentschura, Ulrich D

“…The process in which a photon splits into three after the collision with a free electron (triple Compton effect) is the most basic process for the generation…”
Get full text

Nonperturbative treatment of double compton backscattering in intense laser fields by Lötstedt, Erik, Jentschura, Ulrich D

“…The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic…”
Get full text

From Dirac theories in curved space-times to a variation of Dirac's large-number hypothesis by Jentschura, Ulrich D.

Get full text

Multi-instantons and exact results I: conjectures, WKB expansions, and instanton interactions by Zinn-Justin, Jean, Jentschura, Ulrich D.

“…We consider specific quantum mechanical model problems for which perturbation theory fails to explain physical properties like the eigenvalue spectrum even…”
Get full text

Generalized Nonanalytic Expansions, PT-Symmetry and Large-Order Formulas for Odd Anharmonic Oscillators by Jentschura, Ulrich D.

“…The concept of a generalized nonanalytic expansion which involves nonanalytic combinations of exponentials, logarithms and powers of a coupling is introduced…”
Get full text

Recursive algorithm for arrays of generalized Bessel functions: Numerical access to Dirac-Volkov solutions by Lötstedt, Erik, Jentschura, Ulrich D

“…In the relativistic and the nonrelativistic theoretical treatment of moderate and high-power laser-matter interaction, the generalized Bessel function occurs…”
Get full text

Multi-instantons and exact results II: specific cases, higher-order effects, and numerical calculations by Zinn-Justin, Jean, Jentschura, Ulrich D.

“…In this second part of the treatment of instantons in quantum mechanics, the focus is on specific calculations related to a number of quantum mechanical…”
Get full text