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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:38 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Strange matter
Authors:
Ş. Domokos
Affiliation:
Department of Physics, Chemistry and Biology,
Technical School Group Saint Sava, Berca, Jud. Buzău, Romania
E-mail
domokosif@yahoo.com
Keywords:
Strange matter
Abstract:
It was analyzed, using the M.I.T. bag model of hardons, the density at which can be produced one phase transition from neutron matter to a uniform quark liquid, formed from u and d quarks in the neutron stars [1].
Is resulting that the energy per baryon minus the energy of the nucleon is greater than 0 [1]. But the quark phase has lower energy per baryon than the neutron phase at high density [1].
It was analyzed the possibility that in neutron stars to exist one matter of quarks, and was considered that in dense systems the quark confining potentials are screened by many body effects [2].
It was computed the energy per baryon minus the energy of the nucleon for multiquark states, for the u and d quarks with 0 masses and the s quark with mass, with N(i) quarks of flavors i (=u, d, s) in a volume V, and is resulting that this is positive function on the strange-quark fraction N(i)/A [3].
Were studied the properties of quark matter, formed from u, d and s quarks in equilibrium with respect to the weak interactions at zero temperature and external pressure, considering this as a Fermi gas, and is resulting that for certain values of the QCD parameters (B which is the bag constant, the QCD coupling, and the strange quark mass m) the strange matter is stable [4].
Because the strange quark mass has the minimum value of m=70 MeV [5], and because for the QCD coupling of 0,6 the strange matter has negative electric charge for m<50 MeV [4], we find that for the QCD coupling smaller than 0,6 the strange matter has not negative charge.
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