1,732 research outputs found
Nontrivial Deformation of a Trivial Bundle
The -prolongation of the Hopf fibration is a
trivializable principal -bundle. We present a noncommutative
deformation of this bundle to a quantum principal -bundle that
is not trivializable. On the other hand, we show that the -bundle is piecewise trivializable with respect to the closed covering
of by two hemispheres intersecting at the equator.Comment: The present paper has been extracted from an earlier version of
arXiv:1101.0201, so that there are some overlaps in introductory parts and
standard definition
Color octet scalars and high p_T four-jet events at the LHC
We study the effect of color octet scalars on the high transverse momenta four-jet cross section at the LHC. We consider both weak singlet and doublet scalars, concentrating on the case of small couplings to quarks. We find that a relatively early discovery at the LHC is possible for a range of scalar masses
Dark Matter from Unification of Color and Baryon Number
We analyze a recently proposed extension of the Standard Model based on the
SU(4) x SU(2)_L x U(1)_X gauge group, in which baryon number is interpreted as
the fourth color and dark matter emerges as a neutral partner of the ordinary
quarks under SU(4). We show that under well-motivated minimal flavor-violating
assumptions the particle spectrum contains a heavy dark matter candidate which
is dominantly the partner of the right-handed top quark. Assuming a standard
cosmology, the correct thermal relic density through freeze-out is obtained for
dark matter masses around 2 - 3 TeV. We examine the constraints and future
prospects for direct and indirect searches for dark matter. We also briefly
discuss the LHC phenomenology, which is rich in top quark signatures, and
investigate the prospects for discovery at a 100 TeV hadron collider.Comment: 6 pages, 5 figure
Finite closed coverings of compact quantum spaces
We show that a projective space P^\infty(Z/2) endowed with the Alexandrov
topology is a classifying space for finite closed coverings of compact quantum
spaces in the sense that any such a covering is functorially equivalent to a
sheaf over this projective space. In technical terms, we prove that the
category of finitely supported flabby sheaves of algebras is equivalent to the
category of algebras with a finite set of ideals that intersect to zero and
generate a distributive lattice. In particular, the Gelfand transform allows us
to view finite closed coverings of compact Hausdorff spaces as flabby sheaves
of commutative C*-algebras over P^\infty(Z/2).Comment: 26 pages, the Teoplitz quantum projective space removed to another
paper. This is the third version which differs from the second one by fine
tuning and removal of typo
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