Since the beginning of the quest of quark matter deep changes have developed in our concept in understanding its properties. In Table 1 the ideas are collected, which dominated at the beginning of quark matter research. The present status of these ideas are also displayed. Although theoretical models supported the early concept, but the experimental data forced to change these speculations step...

The effect of strong magnetic field on the stability and gross properties of bulk as well as quasi-bulk quark matter has been investigated using the conventional MIT bag model. Both the Landau diamagnetism and the paramagnetism of quark matter has been studied. How the quark hadron phase transition is affected by the presence of strong magnetic field has also been investigated. The equation of ...

Using the Thomas-Fermi model, we investigated the electric characteristics of a static non-magnetized strange star without crust in this paper. The exact solutions of electron number density and electric field above the quark surface are obtained. These results are useful if we are concerned about physical processes near the quark matter surfaces of strange stars. PACS: 97.60.Gb, 97.60.Jd, 97.6...

It is generally agreed that the tremendous densities reached in the centers of neutron stars provide a high pressure environment in which numerous particles processes are likely to compete with each other. These processes range from the generation of hyperons to quark deconfinement to the formation of kaon condensates and H-matter [1]. Another striking possibility concerns the formation of abso...

Theoretical studies suggest that quark matter at suffi ciently high densities and suffi ciently low temperatures may be a color superconductor. (For a review on color superconductivity see for example, Ref. [1].) In nature such conditions appear in the central regions of neutron stars. Therefore it is possible that matter is color superconducting in the cores of these objects. In compact stars ...

A quark-cluster state, rather than the color-super-conductivity state, may appear in matter with low-temperature but high density, since the phase transition of chiral symmetry broken and that of color-confinement could not occur simultaneously. Such quark clusters might be stable in strange quark matter. Quark stars would have temperatures to be low enough to freeze by residual color interacti...

I discuss the zero temperature phase diagram of QCD, as a function of baryon density and strange quark mass. The noteworthy points are that at sufficiently high density chiral symmetry is always restored, and at low strange quark mass there need be no phase transition between nuclear matter and quark matter. I comment on the possibility that introducing a strange quark may make it easier to see...

We imagine shining light on a lump of cold dense quark matter, in the color-flavor locked phase and therefore a transparent insulator. We calculate the angles of reflection and refraction, and the intensity of the reflected and refracted light. Although the only potentially observable context for this phenomenon (reflection of light from and refraction of light through an illuminated quark star...

Results are presented from a numerical study of lattice QCD with gauge group SU(2) and two flavors of Wilson fermion at non-zero quark chemical potential μ ≫ T . Studies of the equation of state, the superfluid condensate, and the Polyakov line all suggest that in addition to the low density phase of Bose-condensed diquark baryons, there is a deconfined phase at higher quark density in which qu...

The ground state of dense up and down quark matter under local and global charge neutrality conditions with β-equilibrium has at least four possibilities: normal, regular 2SC, gapless 2SC phases, and mixed phase composed of 2SC phase and normal components. The discussion is focused on the unusual properties of gapless 2SC phase at zero as well as at finite temperature.