24-28 September 2014
Other Institutes
Africa/Cairo timezone
It intends to devote this international meeting to reviewing recent understanding of underlying physics of the early Universe. In a pioneering way, this international conference combines both high-energy physics, especially in LHC era, and cosmology. The Large Hadron Collider (LHC) is a gigantic scientific instrument that is the world's largest and most powerful particle accelerator ever made. It spans the border between Switzerland and France about 100m underground. It is to study the smallest known particles – the fundamental building blocks of all things. The beams inside the LHC are made to collide at four locations where ATLAS, CMS, ALICE and LHCb are installed. Surely, LHC will revolutionise our understanding, from the minuscule world deep within atoms to the vastness of the Universe. Based on RHIC and currently LHC results, the early Universe would have behaved like a super-hot liquid immediately after the Big Bang. Concretely, the quark-gluon plasma created in these experiments does not form a gas as predicted, but instead suggest that the very early Universe behaved like a hot and might be viscous liquid. Implementing these results on characterizing the matter filling the background geometry would drastically change the traditional picture about the early Universe, references.
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Ends
Africa/Cairo
Other Institutes
Cairo, Egypt
As the early Universe expanded and cooled down, it is likely to expect that the cosmological background matter should undergo a series of symmetry-breaking/restoring phase transitions, at which various topological defects may have formed. The study of phase transition(s) from quark-gluon plasma (QGP) to hadrons in early Universe dates back to about three decades ago. Absolving inflation and electroweak eras, a first-order phase transition in various scenarios is assumed to take place in the QCD matter. The lattice QCD provides us with an accurate tool to study - among others - the thermodynamics of the strongly interacting matter, for example, the QGP critical temperature and order of the phase transition. The extreme conditions in the early Universe, like high temperatures, high densities and out–of–thermal and –chemical equilibrium, likely affect the properties of the partonic matter. We so far have no access to study this issue. The dissimilarity between the heavy-ion collisions (lattice QCD) and the early Universe in order of the phase transition would be strengthened by the fact that the QGP era seems not to be followed by an extreme expansion (inflation). This is apparently the case in heavy-ion collisions, because of the baryon number conservation and the limitation of baryon-to-photon ratio. The QGP era seems to be the last symmetry breaking of strongly interacting matter. With this statement, we mean deconfinement and chiral symmetry breaking and/or restoring. The discovery and detection of ultra high-energy cosmic rays (UHECR) of energy up to 10-t0-20 eV have posed a serious challenge to the astrophysicists about their origin as well as the physical acceleration mechanisms. Therefore, they impose some interesting and challenging questions as their origin and physical acceleration mechanisms are not entirely known