32,811 research outputs found
Latest Results on the Hot-Dense Partonic Matter at RHIC
At the Relativistic Heavy Ion Collider (RHIC) collisions of heavy ions at
nucleon-nucleon energies of 200 GeV appear to have created a new form of matter
thought to be a deconfined state of the partons that ordinarily are bound in
nucleons.We discuss the evidence that a thermalized partonic medium, usually
called a Quark Gluon Plasma (QGP), has been produced. Then we discuss the
effect of this high-density medium on the production of jets and their pair
correlations. Next we look at direct photons as a clean electro-magnetic probe
to constrain the initial hard scatterings. Finally we review the developing
picture for the effect of this medium on the production of open heavy quarks
and on the screening by the QGP of heavy-quark bound states.Comment: 6 pages, 14 figures, proceedings for QNP06 (5-10 June, 2006) invited
tal
The solution to the q-KdV equation
Let KdV stand for the Nth Gelfand-Dickey reduction of the KP hierarchy. The
purpose of this paper is to show that any KdV solution leads effectively to a
solution of the q-approximation of KdV. Two different q-KdV approximations were
proposed, one by Frenkel and a variation by Khesin et al. We show there is a
dictionary between the solutions of q-KP and the 1-Toda lattice equations,
obeying some special requirement; this is based on an algebra isomorphism
between difference operators and D-operators, where . Therefore,
every notion about the 1-Toda lattice can be transcribed into q-language.Comment: 18 pages, LaTe
Object-oriented Tools for Distributed Computing
Distributed computing systems are proliferating, owing to the availability of powerful, affordable microcomputers and inexpensive communication networks. A critical problem in developing such systems is getting application programs to interact with one another across a computer network. Remote interprogram connectivity is particularly challenging across heterogeneous environments, where applications run on different kinds of computers and operating systems. NetWorks! (trademark) is an innovative software product that provides an object-oriented messaging solution to these problems. This paper describes the design and functionality of NetWorks! and illustrates how it is being used to build complex distributed applications for NASA and in the commercial sector
Nonlinear PDEs for gap probabilities in random matrices and KP theory
Airy and Pearcey-like kernels and generalizations arising in random matrix
theory are expressed as double integrals of ratios of exponentials, possibly
multiplied with a rational function. In this work it is shown that such kernels
are intimately related to wave functions for polynomial (Gel'fand-Dickey
reductions) or rational reductions of the KP-hierarchy; their Fredholm
determinant also satisfies linear PDEs (Virasoro constraints), yielding, in a
systematic way, non-linear PDEs for the Fredholm determinant of such kernels.
Examples include Fredholm determinants giving the gap probability of some
infinite-dimensional diffusions, like the Airy process, with or without
outliers, and the Pearcey process, with or without inliers.Comment: Minor revision: accepted for publication on Physica
Integrating CLIPS applications into heterogeneous distributed systems
SOCIAL is an advanced, object-oriented development tool for integrating intelligent and conventional applications across heterogeneous hardware and software platforms. SOCIAL defines a family of 'wrapper' objects called agents, which incorporate predefined capabilities for distributed communication and control. Developers embed applications within agents and establish interactions between distributed agents via non-intrusive message-based interfaces. This paper describes a predefined SOCIAL agent that is specialized for integrating C Language Integrated Production System (CLIPS)-based applications. The agent's high-level Application Programming Interface supports bidirectional flow of data, knowledge, and commands to other agents, enabling CLIPS applications to initiate interactions autonomously, and respond to requests and results from heterogeneous remote systems. The design and operation of CLIPS agents are illustrated with two distributed applications that integrate CLIPS-based expert systems with other intelligent systems for isolating and mapping problems in the Space Shuttle Launch Processing System at the NASA Kennedy Space Center
A hierarchical distributed control model for coordinating intelligent systems
A hierarchical distributed control (HDC) model for coordinating cooperative problem-solving among intelligent systems is described. The model was implemented using SOCIAL, an innovative object-oriented tool for integrating heterogeneous, distributed software systems. SOCIAL embeds applications in 'wrapper' objects called Agents, which supply predefined capabilities for distributed communication, control, data specification, and translation. The HDC model is realized in SOCIAL as a 'Manager'Agent that coordinates interactions among application Agents. The HDC Manager: indexes the capabilities of application Agents; routes request messages to suitable server Agents; and stores results in a commonly accessible 'Bulletin-Board'. This centralized control model is illustrated in a fault diagnosis application for launch operations support of the Space Shuttle fleet at NASA, Kennedy Space Center
Femtoscopic results in Au+Au and p+p from PHENIX at RHIC
Ultra-relativistic gold-gold and proton-proton collisions are investigated in
the experiments of the Relativistic Heavy Ion Collider (RHIC). In the last
several years large amount of results were revealed about the matter created in
these collisions. The latest PHENIX results for femtoscopy and correlations are
reviewed in this paper. Bose-Einstein correlations of charged kaons in 200 GeV
Au+Au collisions and of charged pions in 200 GeV p+p collisions are shown. They
are both compatible with previous measurements of charged pions in gold-gold
collisions, with respect to transverse mass or number of participants scaling.Comment: Talk given at the VI Workshop on Particle Correlations and
Femtoscopy, Kiev, September 14-18, 2010. 6 pages, 4 figures. This work was
supported by the OTKA grant NK73143 and M. Csanad's Bolyai scholarshi
Measurement of light mesons at RHIC by the PHENIX experiment
The PHENIX experiment at RHIC has measured a variety of light neutral mesons
(, K, , , , ) via
multi-particle decay channels over a wide range of transverse momentum. A
review of the recent results on the production rates of light mesons in p+p and
their nuclear modification factors in d+Au, Cu+Cu and Au+Au collisions at
different energies is presented.Comment: 5 pages, 4 figures, talk given at Hard Probes 2008 conference in La
Toja, Spain. submitted to EPJ
- …