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Superfluidity of Lambda hyperons in neutron stars

Y.N. Wang
(
- Nankai U.
)
,
H. Shen
(
- Nankai U.
)

Feb, 2010

22 pages

Published in:

Phys.Rev.C 81 (2010) 025801

e-Print:

1002.0204 [nucl-th]

DOI:

10.1103/PhysRevC.81.025801

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Abstract: (arXiv)

We study the

^1S_0

superfluidity of

\Lambda

hyperons in neutron star matter and neutron stars. We use the relativistic mean field (RMF) theory to calculate the properties of neutron star matter. In the RMF approach, the meson-hyperon couplings are constrained by reasonable hyperon potentials that include the updated information from recent developments in hypernuclear physics. To examine the

^1S_0

pairing gap of

\Lambda

hyperons, we employ several

\Lambda\Lambda

interactions based on the Nijmegen models and used in double-

\Lambda

hypernuclei studies. It is found that the maximal pairing gap obtained is a few tenths of a MeV. The magnitude and the density region of the pairing gap are dependent on the

\Lambda\Lambda

interaction and the treatment of neutron star matter. We calculate neutron star properties and find that whether the

^1S_0

superfluidity of

\Lambda

hyperons exists in the core of neutron stars mainly depends on the

\Lambda\Lambda

interaction used.

Note:

22 pages, 2 Tables, 6 Figure

21.30.Fe
26.60.-c
24.10.Jv
Superfluidity
Relativistic mean field theory
Neutron star matter
mean field approximation: relativistic
neutron star
superfluid
gap

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