15,388 research outputs found
Brane structures in microlocal sheaf theory
Let be an exact Lagrangian submanifold of a cotangent bundle ,
asymptotic to a Legendrian submanifold . We study
a locally constant sheaf of -categories on , called the sheaf of
brane structures or . Its fiber is the -category of
spectra, and we construct a Hamiltonian invariant, fully faithful functor from
to the -category of sheaves of spectra on
with singular support in .Comment: 35 pages, 13 figure
Measurement of single electron spin with sub-micron Hall magnetometer
Submicron Hall magnetometry has been demonstrated as an efficient technique
to probe extremely weak magnetic fields. In this letter, we analyze the
possibility of employing it to detect single electron spin. Signal strength and
readout time are estimated and discussed with respect to a number of practical
issues.Comment: 4 pages, 2 figur
The signatures of the new particles and at e-p colliders in the model
Considering the superior performances of the future e-p colliders, LHeC and
FCC-eh, we discuss the feasibility of detecting the extra neutral scalar
and the light gauge boson , which are predicted by the
model. Taking into account the experimental
constraints on the relevant free parameters, we consider all possible
production channels of and at e-p colliders and
further investigate their observability through the optimal channels in the
case of the beam polarization P()= -0.8. We find that the signal
significance above 5 of as well as detecting
can be achieved via
process and a 5 sensitivity of detecting can be gained
via
process at e-p colliders with appropriate parameter values and a designed
integrated luminosity. However, the signals of decays into pair of SM
particles are difficult to be detected.Comment: 22 pages, 9 figures, references added and typos are correcte
Finite -connected homogeneous graphs
A finite graph \G is said to be {\em -connected homogeneous}
if every isomorphism between any two isomorphic (connected) subgraphs of order
at most extends to an automorphism of the graph, where is a
group of automorphisms of the graph. In 1985, Cameron and Macpherson determined
all finite -homogeneous graphs. In this paper, we develop a method for
characterising -connected homogeneous graphs. It is shown that for a
finite -connected homogeneous graph \G=(V, E), either G_v^{\G(v)} is
--transitive or G_v^{\G(v)} is of rank and \G has girth , and
that the class of finite -connected homogeneous graphs is closed under
taking normal quotients. This leads us to study graphs where is
quasiprimitive on . We determine the possible quasiprimitive types for
in this case and give new constructions of examples for some possible types
- β¦