1,767 research outputs found
Beyond Standard Model Physics
There are many recent results from searches for fundamental new physics using
the TeVatron, the SLAC b-factory and HERA. This talk quickly reviewed searches
for pair-produced stop, for gauge-mediated SUSY breaking, for Higgs bosons in
the MSSM and NMSSM models, for leptoquarks, and v-hadrons. There is a SUSY
model which accommodates the recent astrophysical experimental results that
suggest that dark matter annihilation is occurring in the center of our galaxy,
and a relevant experimental result. Finally, model-independent searches at D0,
CDF, and H1 are discussed
On tiered small jump operators
Predicative analysis of recursion schema is a method to characterize
complexity classes like the class FPTIME of polynomial time computable
functions. This analysis comes from the works of Bellantoni and Cook, and
Leivant by data tiering. Here, we refine predicative analysis by using a
ramified Ackermann's construction of a non-primitive recursive function. We
obtain a hierarchy of functions which characterizes exactly functions, which
are computed in O(n^k) time over register machine model of computation. For
this, we introduce a strict ramification principle. Then, we show how to
diagonalize in order to obtain an exponential function and to jump outside
deterministic polynomial time. Lastly, we suggest a dependent typed
lambda-calculus to represent this construction
Validation of frequency and mode extraction calculations from time-domain simulations of accelerator cavities
The recently developed frequency extraction algorithm [G.R. Werner and J.R.
Cary, J. Comp. Phys. 227, 5200 (2008)] that enables a simple FDTD algorithm to
be transformed into an efficient eigenmode solver is applied to a realistic
accelerator cavity modeled with embedded boundaries and Richardson
extrapolation. Previously, the frequency extraction method was shown to be
capable of distinguishing M degenerate modes by running M different simulations
and to permit mode extraction with minimal post-processing effort that only
requires solving a small eigenvalue problem. Realistic calculations for an
accelerator cavity are presented in this work to establish the validity of the
method for realistic modeling scenarios and to illustrate the complexities of
the computational validation process. The method is found to be able to extract
the frequencies with error that is less than a part in 10^5. The corrected
experimental and computed values differ by about one parts in 10^$, which is
accounted for (in largest part) by machining errors. The extraction of
frequencies and modes from accelerator cavities provides engineers and
physicists an understanding of potential cavity performance as it depends on
shape without incurring manufacture and measurement costs
Kant Revisited
Kant’s first critique is hard to understand, but this author endeavors to bring-out and/or extend aspects of it so that Kant’s system might better account for the existence of consciousnesses as particular subjectivities. The author’s argument about Kant incorporates many connected concerns: the nature of consciousness; the distinction between pure and practical reason; the role intersubjectivity has to play in positing freedom and in bridging subject and object; the foundations of otherness and subjectivity; the relation between being and knowing; and, outer experience and inner sense. In short, the author holds that Kant’s theory produces subjects either too similar or too different if we totally ignore the role that the noumenal realm plays in his ontology. The author suggests a reading of “consciousness of” that is a fusion of the noumenal self and the phenomenal self, saving the general drift of Kant’s potentially incoherent thought. This proposal better fits our experience of space-time and our metastable knowledge there-of. To close, the author reveals a model that depicts the cognitive process of any human as stages in a continuum
Masses of a Fourth Generation with Two Higgs Doublets
We use sampling techniques to find robust constraints on the masses of a
possible fourth sequential fermion generation from electroweak oblique
variables. We find that in the case of a light (115 GeV) Higgs from a single
electroweak symmetry breaking doublet, inverted mass hierarchies are possible
for both quarks and leptons, but a mass splitting more than M(W) in the quark
sector is unlikely. We also find constraints in the case of a heavy (600 GeV)
Higgs in a single doublet model. As recent data from the Large Hadron Collider
hints at the existence of a resonance at 124.5 GeV and a single Higgs doublet
at that mass is inconsistent with a fourth fermion generation, we examine a
type II two Higgs doublet model. In this model, there are ranges of parameter
space where the Higgs sector can potentially counteract the effects of the
fourth generation. Even so, we find that such scenarios produce qualitatively
similar fermion mass distributions.Comment: v2: 9 pages, 7 figures, improved analysis of Higgs decay constraints,
typos corrected and reference adde
Zooarchaeology and Social History of the Butler-McCook Homestead, Hartford, Connecticut
No abstract is available at this time
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