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pro vyhledávání: '"Dick, Rainer"'
Both freeze-in of very weakly coupled dark matter and freeze-out of initially thermalized dark matter from the primordial heat bath provide interesting possibilities for dark matter creation in the early universe. Both scenarios allow for a calculati
Externí odkaz:
http://arxiv.org/abs/2409.05915
Autor:
Dick, Rainer
The measurement problem of quantum mechanics concerns the question under which circumstances coherent wave evolution becomes disrupted to produce eigenstates of observables, instead of evolving superpositions of eigenstates. The problem needs to be a
Externí odkaz:
http://arxiv.org/abs/2406.11005
Autor:
Dick, Rainer
Coherent states are a well-established tool of quantum optics to describe electromagnetic waves in terms of photons. However, they do not describe the near-field regime of radiation sources. Instead, we generically use classical solutions of Maxwell'
Externí odkaz:
http://arxiv.org/abs/2405.10279
Autor:
Dick, Rainer
We show that inelastic scattering leads to a collapse of the wave function within standard evolution through the Schroedinger equation, whereas elastic scattering will not collapse the wave function. Specifically, we find that the initial width of th
Externí odkaz:
http://arxiv.org/abs/2401.15110
Autor:
Fenwick, Joshua G., Dick, Rainer
Imposing the Born rule as a fundamental principle of quantum mechanics would require the existence of normalizable wave functions also for relativistic particles. Indeed, the Fourier transforms of normalized k-space amplitudes yield normalized x-spac
Externí odkaz:
http://arxiv.org/abs/2304.08540
Autor:
Dick, Rainer
We provide a compendium of the quantum mechanical equations for photon emission rates, photon absorption cross sections, and photon scattering cross sections. For each case, the different equations that apply for discrete or continuous electron state
Externí odkaz:
http://arxiv.org/abs/2204.05309
Autor:
Tiwary, Siddharth, Dick, Rainer
Publikováno v:
Eur. Phys. J. C 81 (2021) 1115
Antisymmetric tensor fields are a compelling prediction of string theory. This makes them an interesting target for particle physics because antisymmetric tensors may couple to electromagnetic dipole moments, thus opening a possible discovery opportu
Externí odkaz:
http://arxiv.org/abs/2112.05058
Autor:
Dick, Rainer
We point out that the Kalb-Ramond field can couple to the Ramond and Neveu-Schwarz fields of superstring theory in a way that can generate a coupling of the Kalb-Ramond field to dark matter dipole moments. Electroweak dipole dark matter could then ar
Externí odkaz:
http://arxiv.org/abs/2003.13843
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