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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…
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)…
Fluctuations and phases in baryonic matter
Len Brandes, Norbert Kaiser, Wolfram Weise
The phase structure of baryonic matter is investigated with focus on the role of fluctuations beyond the mean-field approximation. The prototype test case studied is the chiral nuc…
Energy per particle of nuclear and neutron matter from subleading chiral three-nucleon interactions
N. Kaiser
We derive from the subleading contributions to the chiral three-nucleon interaction [published in Phys.~Rev.~C77, 064004 (2008) and Phys.~Rev.~C84, 054001 (2011)] their first-order…