TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.16.6.156
TI  - Symmetry energy in holographic QCD
PY  - 2024/06/19
UR  - https://scipost.org/SciPostPhys.16.6.156
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 16
IS  - 6
SP  - 156
A1  - Bartolini, Lorenzo
AU  - Gudnason, Sven Bjarke
AB  - We study the symmetry energy (SE), an important quantity in nuclear physics, in the Witten-Sakai-Sugimoto model and in a much simpler hard-wall model of holographic QCD. The SE is the energy contribution to the nucleus due to having an unequal number of neutrons and protons. Using a homogeneous Ansatz representing smeared instantons and quantizing their isospin, we extract the SE and the proton fraction assuming charge neutrality and beta-equilibrium, using quantization of the isospin zeromode. We also show the equivalence between our method adapted from solitons and the usual way of the isospin controlled by a chemical potential at the holographic boundary. We find that the SE can be well described in the WSS model if we allow for a larger 't Hooft coupling and lower Kaluza-Klein scale than is normally used in phenomenological fits.
ER  -

@Article{10.21468/SciPostPhys.16.6.156,
	title={{Symmetry energy in holographic QCD}},
	author={Lorenzo Bartolini and Sven Bjarke Gudnason},
	journal={SciPost Phys.},
	volume={16},
	pages={156},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.16.6.156},
	url={https://scipost.org/10.21468/SciPostPhys.16.6.156},
}