A model finding a new Richardson potential with different scales for confinement and asymptotic freedom, by fitting the properties of Δ++ and

Bagchi, Manjari; Dey, Mira; Daw, Sukanta; Dey, Jishnu

doi:10.1016/j.nuclphysa.2004.05.015

Cited by 12 publications

(22 citation statements)

References 24 publications

(27 reference statements)

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“…One EOS (SS1) obtained by Dey et al (1998) using an unmodified Richardson Potential with both Λ and Λ equal to 100 MeV. matter (our present work) and the properties of confined 3u and 3s baryons (Bagchi et al 2004). Although the confinement part Λ is stronger, leading to a sharp surface, it is softened by medium effects, developing a screening length.…”

Section: Conclusion and Summarymentioning

confidence: 63%

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Compact strange stars with a medium dependence in gluons at finite temperature

Bagchi¹,

Ray²,

Dey³

et al. 2006

A&A

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Aims. The possible existence of strange stars in the universe will help in the understanding of various properties of quantum chromodynamics, like asymptotic freedom and chiral symmetry restoration, which is otherwise very difficult to prove in laboratory experiments. Methods. Strange star properties were calculated using large color approximation with built-in chiral symmetry restoration. A relativistic Hartree Fock calculation was performed using the Richardson potential as an interquark interaction. This potential has the asymptotic freedom and a confinement-deconfinement mechanism built into it and the present calculation employs an application of this potential with modified two scale parameters Λ and Λ , to find a new set of equations of state for strange quark matter. The linear confinement string tension from lattice calculations is 350 MeV and the Coulomb -like part has the parameter 100 MeV from deep inelastic scattering experiments. We also consider the effect of temperature, on gluon mass in a simple way, in addition to the usual density dependence, Results. We obtained a set of new equation of states for strange quark matter and also found that the transition temperature from hadronic matter to strange matter is at 80 MeV, close to the 100 MeV estimated in literature. Conclusions. Formation of strange stars may be the only signal for formation of quark-gluon plasma with asymptotic freedom and chiral symmetry restoration and this may be observable through many processes -such as for example through delayed γ ray afterglow.

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Section: Conclusion and Summarymentioning

confidence: 63%

“…Indeed, for self bound high density strange quark matter, Dey et al (1998) found that Λ needed to be ∼100 MeV. In the present paper, proper scales are chosen for both the parameters, as determined from a calculation by Bagchi et al (2004) by fitting the masses and recently determined magnetic moments of Ω − and ∆ ++ . In Sect.…”

Section: Introductionmentioning

confidence: 99%

Compact strange stars with a medium dependence in gluons at finite temperature

Bagchi¹,

Ray²,

Dey³

et al. 2006

A&A

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show abstract

“…Since then, strange star properties have been calculated with a modified Richardson potential, which has different scales for AF and confinement. The scale values were obtained from baryon magnetic moment calculations (Bagchi et al 2004). In this model, chiral symmetry restoration at high density is incorporated by introducing density‐dependent quark masses.…”

Section: Mean Field Model For Strange Starsmentioning

confidence: 99%

Chromothermal oscillations and collapse of strange stars to black holes: astrophysical implications

Bagchi¹,

Ouyed²,

Staff³

et al. 2008

Monthly Notices RAS

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We study the effects of temperature on strange stars. It is found that the maximum mass of the star decreases with the increase of temperature, as at high temperatures the equations of state become softer. Moreover, if the temperature of a strange star increases, keeping its baryon number fixed, its gravitational mass increases and its radius decreases. This leads to a limiting temperature, where it turns into a black hole. These features are the result of a combined effect of the change of gluon mass and the quark distribution with temperature. We report on a new type of radial oscillation of strange stars, driven by what we call ‘chromothermal’ instability. We also discuss the relevance of our findings in the astrophysics of core collapse supernovae and gamma‐ray bursts.

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“…A baryonic system like stars can be explored in relativistic tree level calculation with a potential which may be obtained from the meson sector phenomenology in (Witten 1979) using 1/ N C theory. We have done this with Richardson potential – modified to have different scales for AF and confinement–deconfinement mechanism (CDM) with parameters are fitted from baryon magnetic moments (Bagchi et al 2004). So there are no free potential parameters left in SS calculations.…”

Section: The Modelmentioning

confidence: 99%

“…Λ′ is the scale parameter corresponding to confinement as the third term reduces to a linear confinement for small q . From Bagchi et al (2004), we get Λ= 100 MeV and Λ′= 350 MeV. The modified potential is used in SS calculation (Bagchi et al 2005).…”

Section: The Modelmentioning

confidence: 99%

Evidence for strange stars from joint observation of harmonic absorption bands and of redshift

Bagchi¹,

Ray²,

Dey³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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From recent reports on terrestrial heavy ion collision experiments it appears that one may not obtain information about the existence of asymptotic freedom (AF) and chiral symmetry restoration (CSR) for quarks of QCD at high density. This information may still be obtained from compact stars -if they are made up of strange quark matter (SQM).Very high gravitational redshift lines (GRL), seen from some compact stars, seem to suggest high ratios of mass and radius (M/R) for them. This is suggestive of strange stars (SS) and can in fact be fitted very well with SQM equation of state (EOS) deduced with built in AF and CSR. In some other stars broad absorption bands (BAB) appear at about ∼0.3 keV and multiples thereof, that may fit in very well with resonance with harmonic compressional breathing mode frequencies of these SS. Emission at these frequencies are also observed in six stars.If these two features of large GRL and BAB were observed together in a single star, it would strengthen the possibility for the existence of SS in nature and would vindicate the current dogma of AF and CSR that we believe in QCD. Recently, in 4U 1700 − 24, both features appear to be detected, which may well be interpreted as observation of SS -although the group that analyzed the data did not observe this possibility. We predict that if the shifted lines, that has been observed, are from neon with GRL shift z = 0.4 -then the compact object emitting it is a SS of mass 1.2 M and radius 7 km. In addition the fit to the spectrum leaves a residual with broad dips at 0.35 keV and multiples thereof, as in 1E 1207 − 5209 which is again suggestive of SS.

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A model finding a new Richardson potential with different scales for confinement and asymptotic freedom, by fitting the properties of Δ++ and

Cited by 12 publications

References 24 publications

Compact strange stars with a medium dependence in gluons at finite temperature

Compact strange stars with a medium dependence in gluons at finite temperature

Chromothermal oscillations and collapse of strange stars to black holes: astrophysical implications

Evidence for strange stars from joint observation of harmonic absorption bands and of redshift

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