Zobrazeno 1 - 10
of 2 119
pro vyhledávání: '"Ulrich D"'
Publikováno v:
Phys. Rev. A 110, 032816 (2024)
For an accurate theoretical description of muonic bound systems, it is crucial to consistently treat relativistic and recoil corrections to vacuum polarization. The one-loop vacuum-polarization effect is by far the dominant quantum electrodynamic (QE
Externí odkaz:
http://arxiv.org/abs/2409.17068
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
Autor:
Giorgini, Ludovico T., Jentschura, Ulrich D., Malatesta, Enrico M., Rizzo, Tommaso, Zinn-Justin, Jean
Publikováno v:
Phys.Rev.D 110 (2024) 036003
We discuss numerical aspects of instantons in two- and three-dimensional $\phi^4$ theories with an internal $O(N)$ symmetry group, the so-called $N$-vector model. Combining asymptotic transseries expansions for large argument with convergence acceler
Externí odkaz:
http://arxiv.org/abs/2405.18191
Autor:
Jentschura, Ulrich D.
Publikováno v:
Phys.Rev.A 110 (2024) 012808
The calculation of higher-order binding corrections to bound systems is a fundamental problem of theoretical physics. For any nonrelativistic expansion, one needs the Foldy-Wouthuysen Transformation which disentangles the particle and the antiparticl
Externí odkaz:
http://arxiv.org/abs/2405.18714
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:
Jentschura, Ulrich D., Yost, Dylan C.
Publikováno v:
Phys.Rev.A 108 (2023) 062822
The so-called proton radius puzzle (the current discrepancy of proton radii determined from spectroscopic measurements in ordinary versus muonic hydrogen) could be addressed via an accurate measurement of the Rydberg constant, because the proton radi
Externí odkaz:
http://arxiv.org/abs/2310.00507