13,374 research outputs found
Resummation of Boson-Jet Correlation at Hadron Colliders
We perform a precise calculation of the transverse momentum ()
distribution of the boson+jet system in boson production events. The boson can
be either a photon, , or Higgs boson with mass , and is
the sum of the transverse momenta of the boson and the leading jet with
magnitude . Using renormalization group techniques and
soft-collinear effective theory, we resum logarithms and
at next-to-leading logarithmic accuracy including the non-global logarithms,
where and are respectively the hard scattering energy and the radius of
the jet. Specifically, we investigate two scenarios of or
in +jet events, and we examine the distributions
with different jet radii and study the effect of non-global logarithms. In the
end we compare our theoretical calculations with Monte Carlo simulations and
data from the LHC.Comment: 35 pages, 7 figure
Black hole solution and strong gravitational lensing in Eddington-inspired Born-Infeld gravity
A new theory of gravity called Eddington-inspired Born-Infeld (EiBI) gravity
was recently proposed by Ba\~{n}ados and Ferreira. This theory leads to some
exciting new features, such as free of cosmological singularities. In this
paper, we first obtain a charged EiBI black hole solution with a nonvanishing
cosmological constant when the electromagnetic field is included in. Then based
on it, we study the strong gravitational lensing by the asymptotic flat charged
EiBI black hole. The strong deflection limit coefficients and observables are
shown to closely depend on the additional coupling parameter in the
EiBI gravity. It is found that, compared with the corresponding charged black
hole in general relativity, the positive coupling parameter will
shrink the black hole horizon and photon sphere. Moreover, the coupling
parameter will decrease the angular position and relative magnitudes of the
relativistic images, while increase the angular separation, which may shine new
light on testing such gravity theory in near future by the astronomical
instruments.Comment: 14 pages, 7 figures, 1 table. Two issues on the deflection angle and
photon sphere were corrected and clarifie
Non-classicalities via perturbing local unitary operations
We study the nonclassical correlations in a two-qubit state by the perturbing
local unitary operation method. We find that the definitions of various
non-classicalities including quantum discord (QD), measurement-induced
nonlocality (MIN) and so on usually do not have a unique definition when
expressed as the perturbation of local unitary operations, so a given
non-classicality can lead to different definitions of its dual
non-classicality. In addition, it is shown that QD and MIN are not the
corresponding dual expressions in a simple set of unitary operations, even
though they are in their original definitions. In addition, we also consider
the non-classicalities in general dimensional systems
Entropy/Area spectra of the charged black hole from quasinormal modes
With the new physical interpretation of quasinormal modes proposed by
Maggiore, the quantum area spectra of black holes have been investigated
recently. Adopting the modified Hod's treatment, results show that the area
spectra for black holes are equally spaced and the spacings are in a unified
form, , in Einstein gravity. On the other hand,
following Kunstatter's method, the studies show that the area spectrum for a
nonrotating black hole with no charge is equidistant. And for a rotating (or
charged) black hole, it is also equidistant and independent of the angular
momentum (or charge ) when the black hole is far from the extremal case.
In this paper, we mainly deal with the area spectrum of the stringy charged
Garfinkle-Horowitz-Strominger black hole, originating from effective action
that emerges in the low-energy string theory. We find that both methods give
the same results-that the area spectrum is equally spaced and does not depend
on the charge . Our study may provide new insights into understanding the
area spectrum and entropy spectrum for stringy black holes.Comment: 13 pages, no figure
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