7,822 research outputs found
CP Violation in the Higgs Sector of the MSSM
Recently, it has been found that the tree-level CP invariance of the Higgs
potential in the MSSM can be sizeably broken by loop effects due to
soft-CP-violating trilinear interactions involving third generation scalar
quarks. These soft-CP-violating couplings may be constrained by considering new
two-loop contributions to the electron and neutron EDMs. The phenomenological
consequences of such a minimal supersymmetric scenario of explicit CP violation
at present and future colliders are briefly discussed.Comment: 11 pages, comments on the renormalization-scheme dependence of the
radiatively-induced CP-odd Higgs phase adde
Some Thoughts on Hypercomputation
Hypercomputation is a relatively new branch of computer science that emerged
from the idea that the Church--Turing Thesis, which is supposed to describe
what is computable and what is noncomputable, cannot possible be true. Because
of its apparent validity, the Church--Turing Thesis has been used to
investigate the possible limits of intelligence of any imaginable life form,
and, consequently, the limits of information processing, since living beings
are, among others, information processors. However, in the light of
hypercomputation, which seems to be feasibly in our universe, one cannot impose
arbitrary limits to what intelligence can achieve unless there are specific
physical laws that prohibit the realization of something. In addition,
hypercomputation allows us to ponder about aspects of communication between
intelligent beings that have not been considered befor
The Lifshitz-Slyozov-Wagner equation for reaction-controlled kinetics
We rigorously derive a weak form of the Lifshitz-Slyozov-Wagner equation as
the homogenization limit of a Stefan-type problem describing
reaction-controlled coarsening of a large number of small spherical particles.
Moreover, we deduce that the effective mean-field description holds true in the
particular limit of vanishing surface-area density of particles.Comment: 15 pages, LaTeX; minor revision, change of titl
Anomalous Fermion Mass Generation at Three Loops
We present a novel mechanism for generating gauge-invariant fermion masses
through global anomalies at the three loop level. In a gauge theory, global
anomalies are triggered by the possible existence of scalar or pseudoscalar
states and heavy fermions, whose masses may not necessarily result from
spontaneous symmetry breaking. The implications of this mass-generating
mechanism for model building are discussed, including the possibility of
creating low-scale fermion masses by quantum gravity effects.Comment: 12 pages, 2 axodraw figures, to appear in MPL
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