Published November 20, 2010
| Version v1
Journal article
NEUTRON STARS WITH SMALL RADII-THE ROLE OF Δ RESONANCES
- 1. Frankfurt Institute of Advanced Studies, 60438 Frankfurt am Main (Germany)
- 2. Gettysburg College, Gettysburg, PA 17325 (United States)
Description
Recent neutron star observations suggest that the masses and radii of neutron stars may be smaller than previously considered, which would disfavor a purely nucleonic equation of state (EoS). In our model, we use a flavor SU(3) sigma model that includes Δ resonances and hyperons in the EoS. We find that if the coupling of the Δ resonances to the vector mesons is slightly smaller than that of the nucleons, we can reproduce both the measured mass-radius relationship and the extrapolated EoS.
Availability note (English)
Available from http://dx.doi.org/10.1088/2041-8205/724/1/L74Additional details
Identifiers
Publishing Information
- Journal Title
- Astrophysical Journal Letters
- Journal Volume
- 724
- Journal Issue
- 1
- Journal Page Range
- p. L74-L77
- ISSN
- 2041-8205
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 42047725
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- EQUATIONS OF STATE; FLAVOR MODEL; HYPERONS; NEUTRON STARS; RESONANCE NEUTRONS; SU-3 GROUPS; VECTOR MESONS
- Descriptors DEC
- BARYONS; BOSONS; COMPOSITE MODELS; ELEMENTARY PARTICLES; EQUATIONS; FERMIONS; HADRONS; LIE GROUPS; MATHEMATICAL MODELS; MESONS; NEUTRONS; NUCLEONS; PARTICLE MODELS; QUARK MODEL; STARS; STRANGE PARTICLES; SU GROUPS; SYMMETRY GROUPS