39 research outputs found
Transverse momentum spectra and elliptic flow: Hydrodynamics with QCD-based equations of state
We present a family of equations of state within a quasiparticle model
adjusted to lattice QCD and study the impact on azimuthal flow anisotropies and
transverse momentum spectra within hydrodynamic simulations for heavy-ion
collisions at energies relevant for LHC.Comment: Aug. 2007. 3 pp. Talk given at the Focus Week of the workshop Heavy
Ion Collisions at the LHC - Last Call for Predictions, Genf, Switzerland, 29
May - 2 June 200
Nietzsche\u27s Final View of Luther and the Reformation
Nietzsche began as an admirer of Luther and the German Reformation. The age of Luther ranked as high in his early opinion as the age of Goethe and Beethoven. From Menschliches, Allzumenschliches on, this favorable attitude toward Luther underwent a strong transformation. In the five years from 1878 to 1883, Nietzscheâs second creative period, Luther emerged as a highly questionable figure, even as a most regrettable event in the history of German and European thought and civilization. But all these severe pronouncements on Luther were only a prelude to the scathing denunciations to come in Nietzsche\u27s post-Zarathustra writings
QCD matter within a quasi-particle model and the critical end point
We compare our quasi-particle model with recent lattice QCD results for the
equation of state at finite temperature and baryo-chemical potential. The
inclusion of the QCD critical end point into models is discussed. We propose a
family of equations of state to be employed in hydrodynamical calculations of
particle spectra at RHIC energies and compare with the differential azimuthal
anisotropy of strange and charm hadrons.Comment: talk at Quark Matter 2005, August 4 - 9, 2005, Budapest, Hungar
A Family of Equations of State Based on Lattice QCD: Impact on Flow in Ultrarelativistic Heavy-Ion Collisions
We construct a family of equations of state within a quasiparticle model by
relating pressure, energy density, baryon density and susceptibilities adjusted
to first-principles lattice QCD calculations. The relation between pressure and
energy density from lattice QCD is surprisingly insensitive to details of the
simulations. Effects from different lattice actions, quark masses and lattice
spacings used in the simulations show up mostly in the quark-hadron phase
transition region which we bridge over by a set of interpolations to a hadron
resonance gas equation of state. Within our optimized quasiparticle model we
then examine the equation of state along isentropic expansion trajectories at
small net baryon densities, as relevant for experiments and hydrodynamic
simulations at RHIC and LHC energies. We illustrate its impact on azimuthal
flow anisotropies and transverse momentum spectra of various hadron species
Water-Gated Charge Doping of Graphene Induced by Mica Substrates
We report on the existence of water-gated charge doping of graphene deposited
on atomically flat mica substrates. Molecular films of water in units of ~0.4
nm-thick bilayers were found to be present in regions of the interface of
graphene/mica hetero-stacks prepared by micromechanical exfoliation of kish
graphite. The spectral variation of the G and 2D bands, as visualized by Raman
mapping, shows that mica substrates induce strong p-type doping in graphene,
with hole densities of {-2}$. The ultrathin water
films, however, effectively block interfacial charge transfer, rendering
graphene significantly less hole-doped. Scanning Kelvin probe microscopy
independently confirmed a water-gated modulation of the Fermi level by 0.35 eV,
in agreement with the optically determined hole density. The manipulation of
the electronic properties of graphene demonstrated in this study should serve
as a useful tool in realizing future graphene applications.Comment: 15 pages, 4 figures; Nano Letters, accepted (2012
Thermal Dileptons at LHC
We predict dilepton invariant-mass spectra for central 5.5 ATeV Pb-Pb
collisions at LHC. Hadronic emission in the low-mass region is calculated using
in-medium spectral functions of light vector mesons within hadronic many-body
theory. In the intermediate-mass region thermal radiation from the Quark-Gluon
Plasma, evaluated perturbatively with hard-thermal loop corrections, takes
over. An important source over the entire mass range are decays of correlated
open-charm hadrons, rendering the nuclear modification of charm and bottom
spectra a critical ingredient.Comment: 2 pages, 2 figures, contributed to Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun
2007 v2: acknowledgment include
Physics with the KLOE-2 experiment at the upgraded DANE
Investigation at a --factory can shed light on several debated issues
in particle physics. We discuss: i) recent theoretical development and
experimental progress in kaon physics relevant for the Standard Model tests in
the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum
Mechanics from time evolution of entangled kaon states, iii) the interest for
improving on the present measurements of non-leptonic and radiative decays of
kaons and eta/eta mesons, iv) the contribution to understand the
nature of light scalar mesons, and v) the opportunity to search for narrow
di-lepton resonances suggested by recent models proposing a hidden dark-matter
sector. We also report on the physics in the continuum with the
measurements of (multi)hadronic cross sections and the study of gamma gamma
processes.Comment: 60 pages, 41 figures; added affiliation for one of the authors; added
reference to section
Martin Luther and the Idea of Monasticism
Monasticism was still a major issue in the first half of the 16th century in Europe. It played a definite role in the life of many men and women. Among the famous, Desiderius Erasmus and Ulrich von Hutten left the monastery easily, even eagerly; Martin Luther on the other hand only after immense inner difficulties. Inevitable as the final break was for Luther, it caused him great anguish of soul both before and after. Hence it is hardly surprising that throughout his numerous writings there are frequent references to what was surely one of the most stirring experiences in his exciting spiritual and intellectual history, the doffing-both literally and figuratively-of the monk\u27s cowl