Effect of thermal fluctuations on the first order quark-hadron phase transition

1999 ◽  
Vol 60 (7) ◽  
Author(s):  
B. K. Agrawal ◽  
Sanatan Digal
Keyword(s):  
Phase Transition ◽  
Thermal Fluctuations ◽  
First Order ◽  
Hadron Phase

The first order quark-hadron phase transition in QCD

1984 ◽  
Vol 145 (3-4) ◽  
pp. 276-280 ◽  
Author(s):  
A.I. Bochkarev ◽  
M.E. Shaposhnikov
Keyword(s):  
Phase Transition ◽  
First Order ◽  
Hadron Phase

scholarly journals Reduction of Sound Speed during Cosmological First Order Phase Transition

1999 ◽  
Vol 183 ◽  
pp. 313-313
Author(s):  
M. Nagasawa ◽  
J. Yokoyama
Keyword(s):  
Phase Transition ◽  
Sound Speed ◽  
Second Law Of Thermodynamics ◽  
High Energy ◽  
Mean Value ◽  
Bubble Nucleation ◽  
Energy Fraction ◽  
Speed Reduction ◽  
First Order ◽  
Hadron Phase

The degree of sound speed reduction is estimated during the coexistence epoch of quark-gluon and hadron phases in the first-order QCD phase transition[1]. The sound speed in a mixture is obtained by simply replacing the energy density with the mean value in the usual formula[2]. Since the adiabatic condition is nothing but the second law of thermodynamics which is useless for the purpose of calculating the sound speed qualitatively, we adopt the conservation of the quality which is the energy fraction of the high-energy phase[2]. This is appropriate because the transition of the phases through bubble nucleation is totally suppressed at the coexistence temperature and the expansion speed of bubbles is so small that energy transfer through bubble expansion or contraction is also expected to be negligible during sound-wave propagation. Using the bag model, the numerical value of the minimum sound speed can be calculated as where the uncertainty comes from the selection of the number of relativistic quark species. Thus we can say that the quark-hadron phase transition has no drastic effect on the development of cosmological density perturbations.

Dynamical Evolution of the Universe in the Quark-Hadron Phase Transition and Nugget Formation

2005 ◽  
Vol 201 ◽  
pp. 461-462
Author(s):  
Ashok. Goyal ◽  
Deepak. Chandra
Keyword(s):  
Phase Transition ◽  
Early Universe ◽  
Dynamical Evolution ◽  
First Order ◽  
Evolution Of The Universe ◽  
Hadron Phase ◽  
First Order Phase Transition ◽  
Nugget Formation ◽  
First Order Phase ◽  
The Universe

We study the dynamics of first-order phase transition in the early Universe when it was 10 −50μs old with quarks and gluons condensing into hadrons. We look at the evolution of the Universe in small as well as large super cooling scenario.

The microsecond old universe — Relics of QCD phase transition

2014 ◽  
Vol 29 (23) ◽  
pp. 1430024 ◽  
Author(s):  
Bikash Sinha
Keyword(s):  
Phase Transition ◽  
Cold Dark Matter ◽  
Baryon Number ◽  
Qcd Phase Transition ◽  
First Order ◽  
Qcd Phase Diagram ◽  
Hadron Phase ◽  
History Of ◽  
Entire History ◽  
The Universe

It is entirely plausible under reasonable conditions, that a first-order QCD phase transition occurred from quarks to hadrons when the universe was about a microsecond old. Relics, if there be any, after the quark–hadron phase transition are the most deciding signatures of the phase transition. It is shown in this paper that quark nuggets, the possible relics of first-order QCD phase transitions with baryon number larger than 1043 will survive the entire history of the universe up to now and can be considered as a candidate for the cold dark matter. The spin down core of the neutron star on the high density low temperature end of the QCD phase diagram initiates transition from hadrons to quarks. As the star spins down, the size of the core goes on increasing. Recently discovered massive Pulsar PSRJ 1614-2230 with a mass of 1.97 ± 0.04M⊙ most likely has a strongly interacting core. What possible observables can there be from these neutron stars?

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