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Professor Rajagopal enjoys thinking about QCD at high temperature and/or density, where various phases of matter in which the quarks and gluons do not coalesce into hadrons or nuclei are found, because understanding these liquids requires linking usually disparate strands of theoretical physics including particle and nuclear physics, cosmology, astrophysics, condensed matter physics and string theory. Heavy ion collision experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) recreate droplets of the hot quark-gluon plasma that filled the microseconds-old universe and show that it is a strongly coupled liquid. Understanding the properties of this phase of matter and how it emerges from QCD is a central challenge for the coming decade. Professor Rajagopal is incorporating insights obtained via gauge/string duality, perturbative QCD calculations, and hydrodynamics in modeling how jets produced in heavy ion collisions are modified via their passage through liquid quark-gluon plasma and how the wakes they leave behind in the droplet of liquid relax and evolve, discerning the most effective ways to use measurements of jets to probe the microscopic structure of this primordial liquid and understand how it forms and hydrodynamics as remarkably quickly as it does. The longer term challenge is to use the data to learn how a strongly coupled liquid which shows no signs of the individual particles of which it is made can emerge from QCD, a quest which resonates with challenges that are central to contemporary condensed matter physics. Professor Rajagopal has also analyzed the critical point in the QCD phase diagram and the interplay of hydrodynamics and fluctuations near it. He has proposed signatures for its experimental detection, showing how to use the collision-energy scan now underway at RHIC to search for the critical point in a large region of the QCD phase diagram.
Research Interests
Papers共 194 篇Author StatisticsCo-AuthorSimilar Experts
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Physical review lettersno. 26 (2024): 262701-262701
NUCLEAR PHYSICS A (2024): 122821
arxiv(2024)
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arxiv(2023)
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arXiv (Cornell University) (2022)
Journal of High Energy Physicsno. 2 (2022)
arXiv (Cornell University) (2022)
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