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92 papers · 1 filter
Special symplectic six-manifolds
Diego Conti, Adriano Tomassini
We classify nilmanifolds with an invariant symplectic half-flat structure. We solve the half-flat evolution equations in one example, writing down the resulting Ricci-flat metric.…
The Giant X-ray Flare of GRB 050502B: Evidence for Late-Time Internal Engine Activity
A. D. Falcone, D. N. Burrows, D. Lazzati +28
Until recently, X-ray flares during the afterglow of gamma ray bursts (GRBs) were a rarely detected phenomenon, thus their nature is unclear. During the afterglow of GRB 050502B, t…
From Toric Geometry to Quiver Gauge Theory: the Equivalence of a-maximization and Z-minimization
Agostino Butti, Alberto Zaffaroni
AdS/CFT predicts a precise relation between the central charge a, the scaling dimensions of some operators in the CFT on D3-branes at conical singularities and the volumes of the h…
Dijet rates with symmetric cuts
A. Banfi
We discuss the physics underlying an all-order resummation of logarithmic enhanced contributions to dijet cross sections, and present preliminary results for the distribution in th…
Swift and XMM observations of the dark GRB 050326
A. Moretti, A. De Luca, D. Malesani +30
We present Swift and XMM observations of GRB 050326, detected by Swift-BAT. The fluence was 7.7x10^-6 erg cm^-2 (20-150 keV), and its spectrum was hard, with a power law photon ind…
Probing the evolution of the near-IR luminosity function of galaxies to z ~ 3 in the Hubble Deep Field South
P. Saracco, A. Fiano, G. Chincarini +6
[Abridged] We present the rest-frame Js-band and Ks-band luminosity function of a sample of about 300 galaxies selected in the HDF-S at Ks<23 (Vega). We use calibrated photometric…