14453650
The one-dimensional Fourier representation and large angular scale foreground contamination in the three-year Wilkinson Microwave Anisotropy Probe data
We employ the one-dimensional Fourier representation (1DFR) to analyse the three-year WMAP?de-biased internal linear combination (DILC) map and its possible contamination with galactic foregrounds. The 1DFR is a representation of the spherical harmonic coefficients for each ? mode using an inverse Fourier transform into one-dimensional curves. On the basis of the a priori assumption that the cosmic microwave background signal should be statistically independent of, and consequently have no significant correlation with, any foregrounds, we cross correlate the 1DFR curves of 2 ? ? ? 10 modes, which are claimed by the WMAP?team to be free of contamination and suitable for whole-sky analysis. We find that eight out of the nine modes are negatively cross correlated with the foreground maps, an event which has a probability of only 9/512 0.0176 for uncorrelated signals. Furthermore, the local extrema of the 1DFR curves between the DILC and those of the foregrounds for ? = 2 and 6 are correlated with significance level below 0.04. We also discuss the minimum variance optimization method and use the properties of the measured cross correlation to estimate the possible level of contamination present in the DILC map.
9528288
Broadening of the QCD 3 flux tube from the AdS / CFT correspondence
We use the finite temperature AdS/CFT approach to demonstrate logarithmic broadening of the confining QCD3 flux tube as a function of quark separation. This behavior indicates that, unlike lattice QCD, there is no roughening transition in the AdS/CFT formulation, which raises the interesting possibility of extrapolating strong coupling results to weak couplings by the use of resummation techniques. In the zero-temperature non-confining limit, we find that this logarithmic broadening of the field strength distribution is absent. Our results are obtained numerically at strong couplings, in the supergravity approximation.
17144718
PRIMORDIAL MAGNETIC FIELDS AND THEIR DEVELOPMENT (APPLIED FIELD THEORY)
122105824
On the static potential in Polyakov's theory of the quantized string
Nuclear Physics B232 (1984) 291-305 © North-Holland Publishing Company ON THE STATIC POTENTIAL IN POLYAKOV'S THEORY OF THE QUANTIZED STRING B. DURHUUS, P. OLESEN and J.L. PETERSEN The Niels Bohr Institute, University of Copenhagen, DK-21 O0 Copenhagen 0, Denmark Received 12 July 1983 We determine that part of the large-distance correction to the linear potential which is proportional to d, the number of spacetime dimensions. We find that the result depends in a surprising way on the parameter /, which appears in the Liouville theory that results when integrations over string fluctuations have been performed. For /* = 0 the correction is of the expected form ~'d 1 24 R' (d--+ -oe,R-+ m). However, for any/~ :~ 0 there is no 1/R potential at all with a coefficient proportional to d. 1. Introduction In this paper we study the static potential between classical "quarks" and "antiquarks" in the string model of Brink, Di Vecchia and Howe [1], following the quantization prescription of Polyakov [2] adapted to cover the case of open strings in refs. [3-5]. (For some reviews see refs. [6, 7].) Some time ago Liascher, Symanzik and Weisz [8] calculated the corresponding object in the string model of Eguchi [9]. They found in the approximation of small string fluctuations at large distances VLsw(R)=rR d-2 1 ( 1 ) - --2-a--,~ + 0 ~ , (1) where z is the string tension and d is the spacetime dimension. A similar result for the old dual string is implicit in the work of Brink and Nielsen [10] and of Minami [11]. Subsequently Alvarez [12] computed leading 1/d corrections, and Liascher [13] emphasized the generality of the result by pointing out that the coefficient of the 1/R correction of the potential is universal in the sense that it must be expected in all models where the string position is the only degree of freedom. Then the factor d - 2 is simply the number of transverse modes, the remaining 2 longitudinal modes being gauge artifacts. 291
123765342
Asymptotic Freeon : an example of electroweak magnetism
The classical electroweak theory is unstable for magnetic fields H satisfying eH>m 2 w , m w being the W mass. We discuss the origin of this instability and the peculiar anti-screening property of the W-condensate formed. The anti-screening is closely related to the asymptotic freedom of the SU(2) w -fields, thereby motivating the name «Asymptotic Freeon». For sufficiently large magnetic fields we expect symmetry restoration
120229546
Reduced lattice gauge theory in two dimensions
Abstract We show explicitly that the free energy in the Eguchi-Kawai model in two dimensions is equal to the free energy in (QCD(∞)) 2 . The same applies to the expectation values of a loop running an arbitrary number of times around a plaquette. We also present a weak coupling calculation for the free energy, which turns out to be exact.
14031097
The entrainment matrix of a superfluid neutron–proton mixture at a finite temperature
Abstract The entrainment matrix (also termed the Andreev–Bashkin matrix or the mass-density matrix) for a neutron–proton mixture is derived at a finite temperature in a neutron star core. The calculation is performed in the frame of the Landau–Fermi-liquid theory generalized to account for superfluidity of nucleons. It is shown, that the temperature dependence of the entrainment matrix is described by a universal function independent on an actual model of nucleon–nucleon interaction employed. The results are presented in the form convenient for their practical use. The entrainment matrix is important, e.g., in kinetics of superfluid nucleon mixtures or in studies of the dynamical evolution of neutron stars (in particular, in the studies of star pulsations and pulsar glitches).
15303275
Relativistic entrainment matrix of a superfluid nucleon-hyperon mixture. II. Effect of finite temperatures
We calculate the important quantity of superfluid hydrodynamics, the relativistic entrainment matrix for a nucleon-hyperon mixture at arbitrary temperature. In the nonrelativistic limit this matrix is also termed the Andreev-Bashkin or mass-density matrix. Our results can be useful for modeling the pulsations of massive neutron stars with superfluid nucleon-hyperon cores and for studies of the kinetic properties of superfluid baryon matter.