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111 papers
Two-pion exchange nucleon-nucleon potentials with Roper resonance excitation
Norbert Kaiser
Motivated by the recent paper arXiv:2602.11815 [nucl-th], we calculate in these notes the spectral functions (i.e. imaginary parts) of the NN-potentials as they arise from -exc…
Solving the matrix exponential function for special orthogonal groups SO(n) and the exceptional G
Norbert Kaiser
In this work the matrix exponential function is solved analytically for the special orthogonal groups up to . The number of occurring -th matrix powers gets limited…
Evidence against a strong first-order phase transition in neutron star cores: impact of new data
Len Brandes, Wolfram Weise, Norbert Kaiser
With the aim of exploring the evidence for or against phase transitions in cold and dense baryonic matter, the inference of the sound speed and equation-of-state for dense matter i…
Inference of the sound speed and related properties of neutron stars
Len Brandes, Wolfram Weise, Norbert Kaiser
Information on the phase structure of strongly interacting matter at high baryon densities can be gained from observations of neutron stars and their detailed analysis. In the pres…
Solving the matrix exponential function for the groups SU(3), SU(4) and Sp(2)
Norbert Kaiser
The well known analytical formula for matrices \\ is extended to the $SU(3)…
Radiative corrections to elastic muon-proton scattering at low momentum transfers
Norbert Kaiser, Yong-Hui Lin, Ulf-G. Meißner
We systematically calculate the radiative corrections of order to elastic muon-proton scattering at low momentum transfers. These include vacuum polarization, photon-loop for…