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132 papers · 1 filter
The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey
E. Marchese, R. Della Ceca, A. Caccianiga +3
Active galactic nuclei (AGN) emit radiation over a wide range of wavelengths, with a peak of emission in the far-UV region of the electromagnetic spectrum, a spectral region that i…
Triviality problem and the high-temperature expansions of the higher susceptibilities for the Ising and the scalar field models on four-, five- and six-dimensional lattices
Paolo Butera, Mario Pernici
High-temperature expansions are presently the only viable approach to the numerical calculation of the higher susceptibilities for the spin and the scalar-field models on high-dime…
A new family of representatiosnof virtually free groups
Alessandra Iozzi, M. Gabriella Kuhn, Tim Steger
We construct a new family of irreducible unitary representations of a finitely generated virtually free group L. We prove furthermore a general result concerning representations of…
The X-ray light curve of Gamma-ray bursts: clues to the central engine
M. G. Bernardini, R. Margutti, J. Mao +2
We present the analysis of a large sample of gamma-ray burst (GRB) X-ray light curves in the rest frame to characterise their intrinsic properties in the context of different theor…
An all order identity between ABJM and N=4 SYM four-point amplitudes
Marco S. Bianchi, Matias Leoni, Silvia Penati
We derive an exact algebraic identity between the two-loop four-point amplitude in ABJM theory and the corresponding one-loop amplitude in N=4 SYM theory. This identity generalizes…
Stability and symmetry-breaking bifurcation for the ground states of a NLS with a interaction
Riccardo Adami, Diego Noja
We determine and study the ground states of a focusing Schrödinger equation in dimension one with a power nonlinearity and a strong inhomogeneity represented by a sing…