Results 21 to 30 of about 90,289 (109)

Background field method in the large $N_f$ expansion of scalar QED

, 2019
Using the background field method, we, in the large $N_f$ approximation, calculate the beta function of scalar quantum electrodynamics at the first nontrivial order in $1/N_f$ by two different ways.
Deng, Gai-Ge, Zheng, Zhi-Yuan
core   +1 more source

3D Spectrophotometry of Planetary Nebulae in the Bulge of M31 [PDF]

, 2003
We introduce crowded field integral field (3D) spectrophotometry as a useful technique for the study of resolved stellar populations in nearby galaxies. As a methodological test, we present a pilot study with selected extragalactic planetary nebulae (XPN)
Andreas Kelz, Bacon R., Fried D. L., Goudfrooij P., Hoessel J. G., Jurgen Schmoll, Larson R. B., Martin M. Roth, Meisenheimer K., Sabbadin F., Saglia R. P., Shaver P. A., Si’lchenko O., Supper R., Thomas Becker, Walsh J. R., Walsh J. R., White S. D. M.   +17 more
core   +1 more source

Host galaxies of bright high redshift quasars: Luminosities and colours

, 2007
We present the results of a near-infrared imaging study of high redshift (z~3) quasars using the ESO-VLT. Our targets were selected to have luminosities among the highest known (absolute magnitude M_B
Abraham, Bell, Collin, Dunlop, Falomo, Falomo, Floyd, Fontana, Häring, Jahnke, Jahnke, Jorgensen, K. Jahnke, Kaspi, Kauffmann, Kollmeier, Kuhlbrodt, Kuhlbrodt, Kukula, L. Wisotzki, M. Schramm, Magorrian, McLeod, McLeod, McLure, McLure, McLure, Peng, Peng, Persson, Peterson, Ridgway, Shields, Sánchez, Vestergaard, Vestergaard, Wisotzki, Wisotzki   +37 more
core   +1 more source

Suppression of extraneous thermal noise in cavity optomechanics [PDF]

, 2011
Extraneous thermal motion can limit displacement sensitivity and radiation pressure effects, such as optical cooling, in a cavity-optomechanical system. Here we present an active noise suppression scheme and its experimental implementation.
Anetsberger, Arcizet, Aspelmeyer, Black, Braginsky, Braginsky, Butt, Callen, Carmon, Chan, Cleland, Cleland, Cohadon, Cole, Dalziel J. Wilson, Diósi, Drever, Eichenfield, Gabrielson, Genes, Gillespie, Gröblacher, H. J. Kimble, Harry, Jayich, K.-K. Ni, Kippenberg, Marquardt, Marquardt, Metzger, Numata, O’Connell, Penn, Phelps, Pinard, Poggio, Rabl, Riviere, Sankey, Santamore, Saulson, Sheard, Teufel, Thompson, Wilson, Wilson-Rae, Yi Zhao, Zwickl   +47 more
core   +3 more sources

Bayesian methods of astronomical source extraction [PDF]

, 2007
We present two new source extraction methods, based on Bayesian model selection and using the Bayesian Information Criterion (BIC). The first is a source detection filter, able to simultaneously detect point sources and estimate the image background. The
Pilbratt G. L., Richard S. Savage, Schwarz G., Seb Oliver   +3 more
core   +2 more sources

Spectral Solution with a Subtraction Method to Improve Accuracy [PDF]

, 2011
This work addresses the solution to a Dirichlet boundary value problem for the Poisson equation in 1-D, d2u/dx2 = f using a numerical Fourier collocation approach.
Green, Matthew
core   +1 more source

Background field method, Batalin-Vilkovisky formalism and parametric completeness of renormalization

, 2014
We investigate the background field method with the Batalin-Vilkovisky formalism, to generalize known results, study parametric completeness and achieve a better understanding of several properties.
Anselmi, Damiano
core   +1 more source

Separation of soft and collinear infrared limits of QCD squared matrix elements [PDF]

, 2007
We present a simple way of separating the overlap between the soft and collinear factorization formulae of QCD squared matrix elements. We check its validity explicitly for single and double unresolved emissions of tree-level processes.
Nagy, Zoltan, Somogyi, Gabor, Trocsanyi, Zoltan   +2 more
core   +1 more source

Supernova 1998bw - The final phases

, 2002
The probable association with GRB 980425 immediately put SN 1998bw at the forefront of supernova research. Here, we present revised late-time BVRI light curves of the supernova, based on template images taken at the VLT.
A. V. Filippenko, B. Leibundgut, Balberg, Bessell, C. Fransson, C. Kozma, Cappellaro, Clayton, Clocchiatti, F. Patat, Filippenko, Fitzpatrick, Fransson, Fruchter, Fynbo, Galama, Gardner, Höflich, Iwamoto, J. C. Wheeler, J. Sollerman, Kozma, Kulkarni, Lundqvist, Maeda, Mazzali, McKenzie, N. Panagia, Nakamura, P. Challis, P. Garnavich, P. Lundqvist, Patat, R. P. Kirshner, Rejkuba, S. T. Holland, Schechter, Schlegel, Schmidt, Schmidt, Sollerman, Sollerman, Stetson, Stetson, Tan, Weiler, Wilson, Woosley, Woosley   +48 more
core   +1 more source

A new search for planet transits in NGC 6791

, 2007
Context. Searching for planets in open clusters allows us to study the effects of dynamical environment on planet formation and evolution. Aims. Considering the strong dependence of planet frequency on stellar metallicity, we studied the metal rich old
A. Aparicio, A. Arellano Ferro, A. Rosenberg, Adams, Adams, Aigrain, Armitage, Armitage, Baraffe, Bruntt, Burke, Carraro, Claret, Clementini, Corwin, Davies, Desidera, E. Poretti, F. De Marchi, F. Grundahl, Fischer, Freeman, Fregeau, G. Piotto, Gaudi, Gaudi, Gilliland, Girardi, Gratton, Guillot, H. Bruntt, Hartman, Hatzes, Kaluzny, Kaluzny, Kovács, Laughlin, M. Barbieri, M. Montalto, Mochejska, Mochejska, Orosz, P. B. Stetson, Paulson, Peterson, Piotto, Piotto, Pont, R. G. Gratton, R. U. Claudi, S. Desidera, Santos, Sato, Sigurdsson, Smith, Sozzetti, Stetson, Stetson, Stetson, Street, Tamuz, Taylor, Tingley, Tingley, von Braun, Woolfson, Y. Momany   +66 more
core   +1 more source