6,158 research outputs found
Exotic matter on singular divisors in F-theory
We analyze exotic matter representations that arise on singular seven-brane
configurations in F-theory. We develop a general framework for analyzing such
representations, and work out explicit descriptions for models with matter in
the 2-index and 3-index symmetric representations of SU() and SU(2)
respectively, associated with double and triple point singularities in the
seven-brane locus. These matter representations are associated with Weierstrass
models whose discriminants vanish to high order thanks to nontrivial
cancellations possible only in the presence of a non-UFD algebraic structure.
This structure can be described using the normalization of the ring of
intrinsic local functions on a singular divisor. We consider the connection
between geometric constraints on singular curves and corresponding constraints
on the low-energy spectrum of 6D theories, identifying some new examples of
apparent "swampland" theories that cannot be realized in F-theory but have no
apparent low-energy inconsistency.Comment: 71 page
How does a developmental relationship mentoring model affect toxicity experienced in mentoring relationships?
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Detection of Exotic Massive Hadrons in Ultra High Energy Cosmic Ray Telescopes
We investigate the detection of exotic massive strongly interacting hadrons
(uhecrons) in ultra high energy cosmic ray telescopes. The conclusion is that
experiments such as the Pierre Auger Observatory have the potential to detect
these particles. It is shown that uhecron showers have clear distinctive
features when compared to proton and nuclear showers. The simulation of uhecron
air showers, and its detection and reconstruction by fluorescence telescopes is
described. We determine basic cuts in observables that will separate uhecrons
from the cosmic ray bulk, assuming this is composed by protons. If these are
composed by heavier nucleus the separation will be much improved. We also
discuss photon induced showers. The complementarity between uhecron detection
in accelerator experiments is discussed.Comment: 9 page 9 figure
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