ON A “MICROSCOPIC HUBBLE CONSTANT” FROM RELATIVISTIC NUCLEAR COLLISIONS

Similarities between cosmological scenarios on the Universe evolution after “Big Bang” and the behavior of the highly excited nuclear matter formed in relativistic nuclear collisions, immediately after collisions, are considered to do an estimation of a “microscopic Hubble parameter/constant” for the expansion rate in relativistic nuclear collisions, similar with the cosmological Hubble constant. Temporal connections between the evolution of the nuclear matter after impact and the scenarios on the Universe evolution after “Big Bang” are introduced. Experimental results on participants, fireball sizes (identical particle interferometry), densities, particle spectra and temperatures have been used. A “Hubble scale” for temporal evolution can be obtained. Satisfactory agreement with Buda-Lund model estimations has been obtained.

[1]  C. Henderson,et al.  The PHOBOS Perspective on Discoveries at RHIC , 2005 .

[2]  P. Staszel.  Recent Results from the Brahms Experiment at Rhic , 2005, nucl-ex/0510061.

[3]  E. al.,et al.  Experimental and theoretical challenges in the search for the quark-gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions , 2005, nucl-ex/0501009.

[4]  E. al.,et al.  Quark gluon plasma and color glass condensate at RHIC? The Perspective from the BRAHMS experiment , 2004, nucl-ex/0410020.

[5]  E. al.,et al.  Formation of dense partonic matter in relativistic nucleus–nucleus collisions at RHIC: Experimental evaluation by the PHENIX Collaboration , 2004, nucl-ex/0410003.

[6]  E. al.,et al.  Forward and midrapidity like-particle ratios from p + p collisions at √ s = 200 GeV , 2004, nucl-ex/0409002.

[7]  A. Jipa.  Overview of the results from the BRAHMS experiment , 2004, nucl-ex/0404011.

[8]  E. al.,et al.  Charged meson rapidity distributions in central Au+Au collisions at s(NN)**(1/2) = 200-GeV , 2004, nucl-ex/0403050.

[9]  R. Debbe,et al.  Centrality dependence of charged-particle pseudorapidity distributions from d + Au collisions at sqrt[sNN] = 200 GeV. , 2004, Physical review letters.

[10]  M. Murray,et al.  Nuclear stopping in Au + Au collisions at s(NN)**(1/2) = 200-GeV. , 2004 .

[11]  Z. Yin.  High pT charged pion and proton production in GeV Au + Au and d + Au collisions , 2004 .

[12]  R. Debbe,et al.  On the evolution of the nuclear modification factors with rapidity and centrality in d + Au collisions at s(NN)**(1/2) = 200-GeV , 2004, nucl-ex/0403005.

[13]  J. Gaardhøje.  The new physics at RHIC. From transparency to high pt suppression , 2004, nucl-ex/0401026.

[14]  R. Debbe,et al.  Transverse momentum spectra in Au+Au and d+Au collisions at s**(1/2) = 200-GeV and the pseudorapidity dependence of high p(T) suppression. , 2003, nucl-ex/0307003.

[15]  C. Jørgensen.  High pT measurements with BRAHMS , 2003 .

[16]  I. Bearden.  From y=0 to y=3: Recent results from BRAHMS , 2003 .

[17]  E. al.,et al.  Rapidity dependence of charged antihadron to hadron ratios in Au+Au collisions at sqrt[s(NN)]=200 GeV. , 2002, Physical review letters.

[18]  O. Gron.  A new standard model of the universe , 2002, 0801.0552.

[19]  B. Budick,et al.  Results from the BRAHMS experiment at RHIC , 2002 .

[20]  I. Bearden.  Antiproton to proton ratio in s NN =130 GeV AuAu collisions , 2002 .

[21]  R. Debbe,et al.  Pseudorapidity distributions of charged particles from Au+Au collisions at the maximum RHIC energy , 2001, nucl-ex/0112001.

[22]  B. Budick,et al.  Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV. , 2001, Physical review letters.

[23]  E. al.,et al.  Charged particle densities from Au+Au collisions at sNN=130 GeV , 2001, nucl-ex/0108016.

[24]  D. Felea,et al.  On the competition between equilibrium and non-equilibrium particle production mechanisms in nucleus–nucleus collisions at 4.5A GeV/c , 2000 .

[25]  A. Jipa,et al.  Some experimental results on unusual states in relativistic nuclear collisions , 1999 .

[26]  M. Turner,et al.  Big-bang nucleosynthesis enters the precision era , 1997, astro-ph/9706069.

[27]  A. Jipa,et al.  Jets of nuclear matter in He-AT inelastic collisions at 4.5 A GeV/c , 1998 .

[28]  T. Csorgo,et al.  Bose-Einstein correlations for three-dimensionally expanding, cylindrically symmetric, finite systems. , 1996, Physical review. C, Nuclear physics.

[29]  A. Jipa.  On the temperature of the pionic sources in nucleus - nucleus collisions at 4.5 A GeV/ c , 1996 .

[30]  A. Jipa,et al.  The moments method for the analysis of the multiplicity distributions in nucleus - nucleus collisions at high energies , 1996 .

[31]  F. Videbæk.  The BRAHMS experiment at RHIC , 1994 .

[32]  A. Jipa,et al.  Participants in relativistic nuclear collisions , 1993 .

[33]  K. Olive.  Cosmology and Particle Physics: A General Review , 1986 .

[34]  Toneev,et al.  Pion production in inelastic and central nuclear collisions at high energy. , 1986, Physical review. C, Nuclear physics.