The quark gluon plasma equation of state and the expansion of the early Universe

Sanches, S. M.; Navarra, F. S.; Fogaça, D. A.

doi:10.1016/j.nuclphysa.2015.02.004

Cited by 29 publications

(31 citation statements)

References 43 publications

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“…However, those features of the QGP (most importantly, its behavior 11 However, in view of the uncertainties currently attending all theories of cosmic magnetogenesis, one should consider the possibility that magnetic fields are larger in Little Inflation than expected -for example, relics of inflationary magnetogenesis might be important. If that were the case, the effect would be to strengthen our conclusions, in the sense that a detailed analysis of (17) shows that the upper bound on μ B /T we are about to deduce would be lowered -though only to a small extent, even for very large fields. These facts are discussed in Appendix A to this paper.…”

Section: The Bound On μ B /Tmentioning

confidence: 76%

“…This has many exciting consequences for the theory of primordial density fluctuations, cosmic magnetogenesis, primordial gravitational waves, and much else (for example, the very interesting ideas of Kalaydzhyan and Shuryak [16] regarding the acoustics of cosmic phase transitions seem to find their most natural context in Little Inflation). In addition, the possibility of large values of μ B during the plasma era has begun to play a role in investigations of the cosmic plasma equation of state [17]. The two alternative trajectories of the cosmic plasma in the quark matter phase diagram are shown, somewhat schematically, in Fig.…”

Section: Holography and Hadronization In The Early Universementioning

confidence: 99%

“…As we know, there are two proposals for the manner in which this happens: fortunately, both of them correspond to particularly simple special cases of the inequality (17).…”

Section: The Bound On μ B /Tmentioning

confidence: 99%

“…Since they are proportional to each other, (17) can in this case be reduced to an expression involving ς B (Eq. (9)) only: we find…”

Section: The Bound On μ B /Tmentioning

confidence: 99%

“…As we explained above, Little Inflation provides a theory of cosmic magnetogenesis, but the magnetic fields involved are not enormously large; so we approximated B by zero in the inequality (17). One should however consider the consequences if that should prove to be incorrect.…”

Section: Appendix a The Effect Of A Magnetic Fieldmentioning

confidence: 99%

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Holography of Little Inflation

McInnes¹

2015

Nuclear Physics B

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For several crucial microseconds of its early history, the Universe consisted of a Quark-Gluon Plasma. As it cooled during this era, it traced out a trajectory in the quark matter phase diagram. The form taken by this trajectory is not known with certainty, but is of great importance: it determines, for example, whether the cosmic plasma passed through a first-order phase change during the transition to the hadron era, as has recently been suggested by advocates of the "Little Inflation" model. Just before this transition, the plasma was strongly coupled and therefore can be studied by holographic techniques. We show that holography imposes a strong constraint (taking the form of a bound on the baryonic chemical potential relative to the temperature) on the domain through which the cosmic plasma could pass as it cooled, with important consequences for Little Inflation. In fact, we find that holography applied to Little Inflation implies that the cosmic plasma must have passed quite close to the quark matter critical point, and might therefore have been affected by the associated fluctuation phenomena.Comment: Expanded explanation of the way holography can be applied to FRW spacetimes; 19 pages, one figure; version to appear in Nuclear Physics

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Section: The Bound On μ B /Tmentioning

confidence: 76%

Section: Holography and Hadronization In The Early Universementioning

confidence: 99%

“…As we know, there are two proposals for the manner in which this happens: fortunately, both of them correspond to particularly simple special cases of the inequality (17).…”

Section: The Bound On μ B /Tmentioning

confidence: 99%

“…Since they are proportional to each other, (17) can in this case be reduced to an expression involving ς B (Eq. (9)) only: we find…”

Section: The Bound On μ B /Tmentioning

confidence: 99%

Section: Appendix a The Effect Of A Magnetic Fieldmentioning

confidence: 99%

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Holography of Little Inflation

McInnes¹

2015

Nuclear Physics B

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Evolution of non-stationary pulses in a cold magnetized quark-gluon plasma

Fogaça

Fariello

Navarra

et al. 2020

Communications in Nonlinear Science and Numerical Simulation

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We study weakly nonlinear wave perturbations propagating in a cold nonrelativistic and magnetized ideal quark-gluon plasma. We show that such perturbations can be described by the Ostrovsky equation. The derivation of this equation is presented for the baryon density perturbations. Then we show that the generalised nonlinear Schrödinger (NLS) equation can be derived from the Ostrovsky equation for the description of quasi-harmonic wave trains. This equation is modulationally stable for the wave number k < k m and unstable for k > k m , where k m is the wave numberwhere the group velocity has a maximum. We study numerically the dynamics of initial wave packets with the different carrier wave numbers and demonstrate that depending on initial parameters they can evolve either into the NLS envelop solitons or into dispersive wave trains.

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Effect of the GUP on the entropy, speed of sound, and bulk to shear viscosity ratio of an ideal QGP

Demir

Vagenas

2018

Nuclear Physics B

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In this work we compute the entropy density, speed of sound, and the resulting impact on the bulk viscosity to shear viscosity ratio of an ideal Quark Gluon Plasma when the effects of a generalized uncertainty principle are taken into consideration. When the parameter of the generalized uncertainty principle tends to zero, i.e., α → 0, we obtain the value of the speed of sound for the ideal gas of massless particles, i.e., c 2 s → 1/3, and we recover the expected result that the bulk viscosity ζ → 0 when α → 0. In addition, in the high temperature limit, i.e., T → ∞, the speed of sound satisfies the equation c 2 s → 1/4. The consequence this has on the bulk viscosity is that in the high temperature limit, the ratio of the bulk to shear viscosity ζ/η → 5/48. Our results suggest that the GUP introduces a scale into the system breaking the a priori conformal invariance of a system of massless noninteracting particles. *

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The quark gluon plasma equation of state and the expansion of the early Universe

Cited by 29 publications

References 43 publications

Holography of Little Inflation

Holography of Little Inflation

Evolution of non-stationary pulses in a cold magnetized quark-gluon plasma

Effect of the GUP on the entropy, speed of sound, and bulk to shear viscosity ratio of an ideal QGP

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