6,325 research outputs found
CMS results on multijet correlations
We present recent measurements of multijet correlations using forward and
low- jets performed by the CMS collaboration at the LHC
collider. In pp collisions at TeV, azimuthal correlations in
dijets separated in rapidity by up to 9.4 units were measured. The results are
compared to BFKL- and DGLAP-based Monte Carlo generator and analytic
predictions. In pp collisions at TeV, cross sections for jets
with > 21 GeV and |y| < 4.7, and for track-jets with
> 1 GeV (minijets) are presented. The minijet results are
sensitive to the bound imposed by the total inelastic cross section, and are
compared to various models for taming the growth of the cross
section at low .Comment: Talk at "Diffraction 2014" workshop, Primosten, Croatia, September
10-16, 201
Estimates for eigenvalues of the Schr\"odinger operator with a complex potential
We study the distribution of eigenvalues of the Schr\"odinger operator with a
complex valued potential . We prove that if decays faster than the
Coulomb potential, then all eigenvalues are in a disc of a finite radius
A Lagrangian Neighbourhood Theorem for shifted symplectic derived schemes
Pantev, Toen, Vaqui\'e and Vezzosi arXiv:1111.3209 defined -shifted
symplectic derived schemes and stacks for , and
Lagrangians in them. They have important
applications to Calabi-Yau geometry and quantization. Bussi, Brav and Joyce
arXiv:1305.6302 proved a 'Darboux Theorem' giving explicit Zariski or \'etale
local models for -shifted symplectic derived schemes for
presenting them as twisted shifted cotangent bundles.
We prove a 'Lagrangian Neighbourhood Theorem' giving explicit Zariski or
etale local models for Lagrangians in -shifted
symplectic derived schemes for , relative to the
Bussi-Brav-Joyce 'Darboux form' local models for . That is, locally
such Lagrangians can be presented as twisted shifted conormal bundles. We also
give a partial result when .
We expect our results will have future applications to -shifted Poisson
geometry (see arXiv:1506.03699), to defining 'Fukaya categories' of complex or
algebraic symplectic manifolds, and to categorifying Donaldson-Thomas theory of
Calabi-Yau 3-folds and 'Cohomological Hall algebras'.Comment: 68 page
Time scale for the formation of the earth and planets and its role in their geochemical evolution
The initial mass of the solar nebula is discussed. Models of a massive nebula (two solar masses and more) encounter serious difficulties: an effective mechanism of transfer of the momentum from the central part of the nebula outward, capable of leading to formation of the sun and removal of half the mass of the nebula from the solar system has not been found. As a consequence of the instability of these models, their evolution can end with the formation, not a planetary system, but of a binary star. The possibility is demonstrated of obtaining acceptable growth rates for Uranus and Neptune by prolonging the thickening of preplanetary dust in the region of large masses. The important role of large bodies in the process of formation of the planets is noted. The impacts of such bodies, moving in heliocentric orbits, could have imparted considerable additional energy to the forming Moon, which, together with the energy given off by the joining of a small number of large protomoons, could have led to a high initial temperature of the moon
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