Zobrazeno 1 - 10
of 245
pro vyhledávání: '"Ulrich D. Jentschura"'
Autor:
Ulrich D. Jentschura
Publikováno v:
Physics, Vol 2, Iss 3, Pp 397-411 (2020)
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 falling on anti–Earth (not on Earth). On the microscopic level, the Dirac equation in curved s
Externí odkaz:
https://doaj.org/article/c6a2db426d044eb68f4209de39a0dfe0
Autor:
Ulrich D. Jentschura
Publikováno v:
Particles, Vol 3, Iss 3, Pp 630-641 (2020)
The hypothesis of Lorentz violation in the neutrino sector has intrigued scientists for the last two to three decades. A number of theoretical arguments support the emergence of such violations, first and foremost for neutrinos, which constitute the
Externí odkaz:
https://doaj.org/article/d2b2be20ffd647d8a7fa5fbe11b674df
Publikováno v:
Atoms, Vol 11, Iss 1, p 10 (2023)
We calculate the fully retarded one-photon exchange interaction potential between electrically neutral, identical atoms, one of which is assumed to be in an excited state, by matching the scattering matrix (S matrix) element with the effective Hamilt
Externí odkaz:
https://doaj.org/article/7c2420f328054e55a7679d35607eab34
Autor:
José Nicasio, Ulrich D. Jentschura
Publikováno v:
Symmetry, Vol 14, Iss 12, p 2596 (2022)
We investigate the time propagation of tachyonic (superluminal) and tardyonic (subluminal, ordinary) massive wave packets on cosmic scales. A normalizable wave packet cannot be monochromatic in momentum space and thus acquires a positional uncertaint
Externí odkaz:
https://doaj.org/article/ec08897362b744acae152541d686a8f5
Publikováno v:
Atoms, Vol 10, Iss 1, p 6 (2022)
Pressure shifts inside an atomic beam are among the more theoretically challenging effects in high-precision measurements of atomic transitions. A crucial element in their theoretical analysis is the understanding of long-range interatomic interactio
Externí odkaz:
https://doaj.org/article/60918dfb54ce4d4eb3ac8953a0692dae
Publikováno v:
Atoms, Vol 10, Iss 1, p 1 (2021)
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 metastable 2S state. At the magic wavelength, the dynamic Stark shifts of the ground and t
Externí odkaz:
https://doaj.org/article/6c244f90f9c8404bb93987f20119d2fa
Autor:
Ulrich D. Jentschura, István Nándori
Publikováno v:
Advances in High Energy Physics, Vol 2017 (2017)
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. The observation of PeV neutrinos by IceCube implies their stability against lepton pair Cer
Externí odkaz:
https://doaj.org/article/a265bd01798447c8ad4d9301b9aa3bb8
Autor:
Ulrich D. Jentschura, Robert Ehrlich
Publikováno v:
Advances in High Energy Physics, Vol 2016 (2016)
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. Important bounds on the size of a hypothetical tachyonic neutrino mass term are set by lepton
Externí odkaz:
https://doaj.org/article/caebf5feb95e482f913bef8bbbac1158
Publikováno v:
Atoms, Vol 5, Iss 4, p 48 (2017)
The collisional shift of a transition constitutes an important systematic effect in high-precision spectroscopy. Accurate values for van der Waals interaction coefficients are required in order to evaluate the distance-dependent frequency shift. We h
Externí odkaz:
https://doaj.org/article/add2cf5401654dd18b6b8580db4be5a8
Publikováno v:
Symmetry, Integrability and Geometry: Methods and Applications, Vol 5, p 005 (2009)
The concept of a generalized nonanalytic expansion which involves nonanalytic combinations of exponentials, logarithms and powers of a coupling is introduced and its use illustrated in various areas of physics. Dispersion relations for the resonance
Externí odkaz:
https://doaj.org/article/6390234d28624b37a634dfcb2c4baaa7