dorsal/arxiv
View SchemaComposition, Structure and Evolution of Neutron Stars with Kaon Condensates
| Authors | V. Thorsson, M. Prakash, J. M. Lattimer |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9305006 |
| URL | https://arxiv.org/abs/nucl-th/9305006 |
| DOI | 10.1016/0375-9474(94)90407-3 |
| Journal | Nucl.Phys. A572 (1994) 693-731; Erratum-ibid. A574 (1994) 851 |
Abstract
We investigate the possibility of kaon condensation in the dense interior of neutron stars through the s--wave interaction of kaons with nucleons. We include nucleon--nucleon interactions by using simple parametrizations of realistic forces, and include electrons and muons in $\beta$--equilibrium. The conditions under which kaon condensed cores undergo a transition to quark matter containing strange quarks are also established. The critical density for kaon condensation lies in the range (2.3--5.0)$~\rho_0$, where $\rho_0=0.16$~fm$^{-3}$ is the equilibrium density of nuclear matter. For too large a value of the strangeness content of the proton, matter with a kaon condensate is not sufficiently stiff to support the lower limit of $1.44 M_\odot$ for a neutron star. Kaon condensation dramatically increases the proton abundance of matter and even allows positrons to exist inside the core. We also consider the case when neutrinos are trapped in the matter. Neutrino trapping shifts both kaon condensation and the quark matter transition to higher densities than in the case of cold, catalyzed matter. A newly--formed neutron star is expected to have a rather low central density, the density rising only after mass accretion onto the star ends after a few seconds. Thus, it is likely that if kaon condensation and/or the quark--hadron phase transition occur, they do so only during or after the mass accretion and neutrino trapping stages. We suggest that neutrino observations from a galactic supernova may provide direct evidence for or against a condensate and/or a quark--hadron transition.
{
"annotation_id": "7eb4eced-a56e-4c97-a69a-773b245a48a9",
"date_created": "2026-03-02T18:00:12.031000Z",
"date_modified": "2026-03-02T18:00:12.031000Z",
"file_hash": "d3f3590d8e8053b2cbd4d2e98658fa90a8709795c526bfc64e1f7243a7267936",
"private": false,
"record": {
"abstract": "We investigate the possibility of kaon condensation in the dense interior of\nneutron stars through the s--wave interaction of kaons with nucleons. We\ninclude nucleon--nucleon interactions by using simple parametrizations of\nrealistic forces, and include electrons and muons in $\\beta$--equilibrium. The\nconditions under which kaon condensed cores undergo a transition to quark\nmatter containing strange quarks are also established. The critical density for\nkaon condensation lies in the range (2.3--5.0)$~\\rho_0$, where\n$\\rho_0=0.16$~fm$^{-3}$ is the equilibrium density of nuclear matter. For too\nlarge a value of the strangeness content of the proton, matter with a kaon\ncondensate is not sufficiently stiff to support the lower limit of $1.44\nM_\\odot$ for a neutron star. Kaon condensation dramatically increases the\nproton abundance of matter and even allows positrons to exist inside the core.\nWe also consider the case when neutrinos are trapped in the matter. Neutrino\ntrapping shifts both kaon condensation and the quark matter transition to\nhigher densities than in the case of cold, catalyzed matter. A newly--formed\nneutron star is expected to have a rather low central density, the density\nrising only after mass accretion onto the star ends after a few seconds. Thus,\nit is likely that if kaon condensation and/or the quark--hadron phase\ntransition occur, they do so only during or after the mass accretion and\nneutrino trapping stages. We suggest that neutrino observations from a galactic\nsupernova may provide direct evidence for or against a condensate and/or a\nquark--hadron transition.",
"arxiv_id": "nucl-th/9305006",
"authors": [
"V. Thorsson",
"M. Prakash",
"J. M. Lattimer"
],
"categories": [
"nucl-th",
"astro-ph"
],
"doi": "10.1016/0375-9474(94)90407-3",
"journal_ref": "Nucl.Phys. A572 (1994) 693-731; Erratum-ibid. A574 (1994) 851",
"title": "Composition, Structure and Evolution of Neutron Stars with Kaon Condensates",
"url": "https://arxiv.org/abs/nucl-th/9305006"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "84ce3185-d044-4fec-a146-bb4c52e91c19",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}