172 research outputs found
Strange matter in rotating compact stars
We have constructed equations of state involving various exotic forms of
matter with large strangeness fraction such as hyperon matter, Bose-Einstein
condensates of antikaons and strange quark matter. First order phase
transitions from hadronic to antikaon condensed and quark matter are considered
here. The hadronic phase is described by the relativistic field theoretical
model. Later those equations of state are exploited to investigate models of
uniformly rotating compact stars. The effect of rotation on the third family
branch for the equation of state involving only antikaon condensates is
investigated. We also discuss the back bending phenomenon due to a first order
phase transition from condensed to quark matter.Comment: 8 pages, 4 figures; Plenary talk delivered at Strangeness in Quark
Matter (SQM) 2004 held in Cape Town, South Africa from 15-20 September;
Accepted for publication in the proceedings in Journal of Physics
Phase II trial of the oral platinum complex JM216 in non-small-cell lung cancer: An EORTC early clinical studies group investigation
Background JM216 is a new oral platinum complex with dose-limiting toxicity myelosuppresssion, now undergoing phase II evaluation. Patients and methods JM216 was evaluated as first line therapy in non-small-cell lung cancer. Seventeen patients received 120 mg/m2/day for five days repeated every three weeks. Results Toxicity was manageable, the commonest side-effects being nausea, vomiting, diarrhoea, constipation and asthenia. Myelososuppression was generally grade <2 and there were no cases of neutropenic sepsis or bleeding. Thirteen patients were fully evaluable for response. No sustained objective responses were reported. One patient was reported as stable disease had a partial response after three courses but was progressing again after four. An additional five patients had stable disease (46.2%). Conclusions Although some patients may have had useful palliation, JM216 did not appear to have significant antitumour activity in non-small-cell lung cance
Neutron star properties in a chiral SU(3) model
We investigate various properties of neutron star matter within an effective
chiral model. The predictions of this model are
compared with a Walecka-type model. It is demonstrated that the importance of
hyperon degrees are strongly depending on the interaction used, even if the
equation of state near saturation density is nearly the same in both models.
While the Walecka-type model predicts a strange star core with strangeness
fraction , the chiral model allows only for
and predicts that , and will not exist in star, in
contrast to the Walecka-type model.Comment: 13 pages, Revtex, 5 figs include
Warm strange hadronic matter in an effective model with a weak Y-Y interaction
An effective model is used to study the equation of state of warm strange
hadronic matter with nucleons, Lambda-hyperons, Xi-hyperons, sigmastar and phi.
In the calculation, a newest weak Y-Y interaction deduced from the recent
observation of a He double hypernucleus is adopted. Employing this effective
model, the results with strong Y-Y interaction and weak Y-Y interaction are
compared.Comment: 9 pages, 9 figure
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