5,228 research outputs found
Hard Probe of Soft Matter Geometry and Fluctuations from RHIC to LHC
We report results on event-by-event hard probe of soft matter geometry and
fluctuations in heavy ion collisions. Geometric data ( of high
hadrons) from RHIC plus LHC clearly favors jet "monography" model with strong
near-Tc enhancement of jet-medium interaction strength which also implies a
less opaque medium at LHC. We also quantify the jet responses to all harmonic
anisotropy () and their manifestation in hard-soft
azimuthal correlations.Comment: 3 pages, 4 figures, contribution to CIPANP2012 Proceeding
Anomalous transport effects and possible environmental symmetry "violation" in heavy ion collisions
The heavy ion collision provides a unique many-body environment where local
domains of strongly interacting chiral medium may occur and in a sense allow
environmental symmetry "violation" phenomena. For example certain anomalous
transport processes, forbidden in usual medium, become possible in such
domains. We briefly review recent progress in both the theoretical
understanding and experimental search of various anomalous transport effects
(such as the Chiral Magnetic Effect, Chiral Separation Effect, Chiral Electric
Separation Effect, Chiral Electric/Magnetic Waves, etc) in the hot QCD fluid
created by such collisions.Comment: final version with minor updates; 24 pages, 5 figures; invited review
for Pramana - Journal of Physic
Advisory Succession in Real Estate Investment Trusts
Adaptation is crucial to realise high data rate transmission in multicarrier communication systems over dispersive channels. Apart from rate/power adaptation enabled by orthogonal frequency division multiplexing (OFDM), OFDM/offset QAM (OFDM/OQAM) systems provide possibility to adjust pulse shapes depending on the channel characteristics. In this paper we discuss and evaluate pulse shape adaptivity in OFDM/OQAM systems with focus on the extended Gaussian functions (EGF) which have been shown to be good candidates for pulse shape adaptation. By investigating the time frequency dispersion robustness and carrier frequency offset sensitivity, both analysis and simulation results show that pulse shape adaptation with respect to the channel state information can improve the system performance.QC 20111108</p
Hydrodynamics with chiral anomaly and charge separation in relativistic heavy ion collisions
Matter with chiral fermions is microscopically described by theory with
quantum anomaly and macroscopically described (at low energy) by anomalous
hydrodynamics. For such systems in the presence of external magnetic field and
chirality imbalance, a charge current is generated along the magnetic field
direction --- a phenomenon known as the Chiral Magnetic Effect (CME). The
quark-gluon plasma created in relativistic heavy ion collisions provides an
(approximate) example, for which the CME predicts a charge separation
perpendicular to the collisional reaction plane. Charge correlation
measurements designed for the search of such signal have been done at RHIC and
the LHC for which the interpretations, however, remain unclear due to
contamination by background effects that are collective flow driven,
theoretically poorly constrained, and experimentally hard to separate. Using
anomalous (and viscous) hydrodynamic simulations, we make a first attempt at
quantifying contributions to observed charge correlations from both CME and
background effects in one and same framework. The implications for the search
of CME are discussed.Comment: 5 pages, 3 figures, Published version in Phys. Lett.
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