1201.3758 (Xiaoyu Lai et al.)
Xiaoyu Lai, Renxin Xu
The nature of pulsar-like compact stars is still in controversy although the
first pulsar was found more than 40 years ago. Generally speaking, conventional
neutron stars and non-mainstream quark stars are two types of models to
describe the inner structure of pulsars, with the former composed mainly of
hadrons and the latter of a peculiar kind of matter whose state equation should
be understood in the level of quarks rather than hadrons. To construct a more
realistic model from both theoretical and observational points of view, we
conjecture that pulsars could be "quark-cluster stars" which are composed of
quark-clusters with almost equal numbers of up, down and strange quarks.
Clustering quark matter could be the result of strong coupling between quarks
inside realistic compact stars. The lightest quark clusters could be of
H-dibaryons, while quark clusters could also be heavier with more quarks. Being
essentially related to the non-perturbative quantum-chromo dynamics (QCD), the
state of supra-nuclear condensed matter is really difficult to obtain strictly
by only theoretical QCD-calculations, and we expect, nevertheless, that
astrophysical observations could help us to have a final solution.
View original:
http://arxiv.org/abs/1201.3758
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