2,128 research outputs found
Tri-N-ification
We consider a natural generalization of trinification to theories with 3N
SU(3) gauge groups. These theories have a simple moose representation and a
gauge boson spectrum that can be interpreted via the deconstruction of a 5D
theory with unified symmetry broken on a boundary. Although the matter and
Higgs sectors of the theory have no simple extra-dimensional analog, gauge
unification retains features characteristic of the 5D theory. We determine
possible assignments of the matter and Higgs fields to unified multiplets and
present theories that are viable alternatives to minimal trinified GUTs.Comment: 21 pages LaTeX, 6 eps figure
A Kaluza-Klein Model with Spontaneous Symmetry Breaking: Light-Particle Effective Action and its Compactification Scale Dependence
We investigate decoupling of heavy Kaluza-Klein modes in an Abelian Higgs
model with space-time topologies and
. After integrating out heavy KK
modes we find the effective action for the zero mode fields. We find that in
the topology the heavy modes do not decouple in
the effective action, due to the zero mode of the 5-th component of the 5-d
gauge field . Because is a scalar under 4-d Lorentz
transformations, there is no gauge symmetry protecting it from getting mass and
interaction terms after loop corrections. In addition, after
symmetry breaking, we find new divergences in the mass that did not
appear in the symmetric phase. The new divergences are traced back to the
gauge-goldstone mixing that occurs after symmetry breaking. The relevance of
these new divergences to Symanzik's theorem is discussed. In order to get a
more sensible theory we investigate the
compactification. With this kind of compact topology, the zero mode
disappears. With no , there are no new divergences and the heavy modes
decouple. We also discuss the dependence of the couplings and masses on the
compactification scale. We derive a set of RG-like equations for the running of
the effective couplings with respect to the compactification scale. It is found
that magnitudes of both couplings decrease as the scale increases. The
effective masses are also shown to decrease with increasing compactification
scale. All of this opens up the possibility of placing constraints on the size
of extra dimensions.Comment: 35 pages, 6 figure
Evaluation der Wertigkeit von Serum Amyloid Alpha und Transthyretin als Biomarker fĂĽr Nierenzellkarzinome
Die Prognose des Nierenzellkarzinoms ist entscheidend durch die Metastasierung bestimmt. Derzeit sind keine Biomarker zur Einschätzung der Aggressivität verfügbar. Durch vorangegangene SELDI-TOF-MS-Analysen konnten SAA und TTR als mögliche Kandidaten ermittelt werden.
Ziel der Arbeit war es, deren Aussagekraft in verschiedenen Subtypen des NZK und vor allem mit Blick auf deren Aggressivität sowie im Verlauf nach Tumornephrektomie zu beurteilen. Im Vergleich sollte die Wertigkeit beim Harnblasenkarzinom und nach Nierentransplantation beurteilt werden. Die Messungen wurden mit jeweils spezifischen ELISA durchgeführt.
Für die einzelnen Subtypen waren signifikante Unterschiede gegenüber der Kontrollgruppe messbar. Zudem fand sich ein positiver Zusammenhang zwischen Malignitätsgrad und lokaler Tumorausbreitung. Die metastasierten klarzelligen NZK zeigten für SAA stark erhöhte Werte und für TTR erniedrigte Werte, die jeweils signifikant waren. Durch Kombination von Cut-offs, die für jedes der beiden Proteine mit ROC-Kurven bestimmt wurden, konnte ein Test entwickelt werden(Sensitivität 90%, Spezifität 53,57%). SAA kann bei NZK als Indikator für Fernmetastasen angesehen werden, eignet sich allerdings nicht zur Früherkennung lokal begrenzter NZK. Für TTR wurden derartige Untersuchungen in der Literatur bisher noch nicht beschrieben.
Im Verlauf nach Tumornephrektomie fiel der initiale starke SAA-Anstieg am ersten postoperativen Tag auf. Daraufhin fiel der Serumspiegel wieder ab, unterschritt aber zu keinem der drei Nachsorgetermine den präoperativen Wert. Vielmehr fanden sich keine signifikanten Unterschiede. Für Blasenkarzinome konnten keine Unterschiede in der SAA-Konzentration im Vergleich mit Kontrollen gemessen werden. Im Bezug auf Nierentransplantationen konnten für SAA und TTR signifikante Unterschiede zur Kontrolle festgestellt werden. Bei einer Abstoßungsreaktion waren zudem die SAA-Werte signifikant höher gegenüber den Werten bei Patienten ohne Abstoßungsreaktion
U(2) Flavor Physics without U(2) Symmetry
We present a model of fermion masses based on a minimal, non-Abelian discrete
symmetry that reproduces the Yukawa matrices usually associated with U(2)
theories of flavor. Mass and mixing angle relations that follow from the simple
form of the quark and charged lepton Yukawa textures are therefore common to
both theories. We show that the differing representation structure of our
horizontal symmetry allows for new solutions to the solar and atmospheric
neutrino problems that do not involve modification of the original charged
fermion Yukawa textures, or the introduction of sterile neutrinos.Comment: 12 pages RevTeX, 1 eps figure. A few typos correcte
b \rightarrow s \gamma AND Z \rightarrow b \overline{b} IN TECHNICOLOR WITH SCALARS
We consider the radiative decay , and the correction
to the vertex in technicolor models with scalars. In these
models, the scalar develops a vacuum expectation value when the technifermions
condense, and the ordinary fermions develop masses via Yukawa couplings. Since
the symmetry breaking sector involves both a fundamental scalar doublet and an
isotriplet of composite scalars (the technipions), the phenomenology associated
with the charged scalars is similar to that found in a type-I two-Higgs doublet
model. We show that the correction to the vertex is small over
the allowed parameter space of the model in the two limits that we consider,
and that there can be large, potentially observable, contributions to the
branching fraction.Comment: 9pp. LaTeX, 4 figures in a uuencoded compressed .ps file We remove
nonstandard LaTeX fonts from the previous versio
Holographic Bosonic Technicolor
We consider a technicolor model in which the expectation value of an
additional, possibly composite, scalar field is responsible for the generation
of fermion masses. We define the dynamics of the strongly coupled sector by
constructing its holographic dual. Using the AdS/CFT correspondence, we study
the S parameter and the phenomenology of the light technihadrons. We find that
the S parameter is small over a significant region of the model's parameter
space. The particle spectrum is distinctive and includes a nonstandard Higgs
boson as well as heavier hadronic resonances. Technihadron masses and decay
rates are calculated holographically, as a function of the model's parameters.Comment: 20 Pages, 4 eps figures, REVTex. Minor corrections and comments adde
Flavor Changing Neutral Currents in a Realistic Composite Technicolor Model
We consider the phenomenology of a composite technicolor model proposed
recently by Georgi. Composite technicolor interactions produce four-quark
operators in the low energy theory that contribute to flavor changing neutral
current processes. While we expect operators of this type to be induced at the
compositeness scale by the flavor-symmetry breaking effects of the preon mass
matrices, the Georgi model also includes operators from higher scales that are
not GIM-suppressed. Since these operators are potentially large, we study their
impact on flavor changing neutral currents and CP violation in the neutral ,
, and meson systems.Comment: 16 pages, LaTeX + embedded PicTeX figures requiring prepictex,
pictex, and postpictex inputs. HUTP.STY include
ProDataMarket: A data marketplace for monetizing linked data
Linked data has emerged as an interesting technology for Publishing structured data on the Web but also as a powerful mechanism for integrating disparate data sources. Various tools and approaches have been developed in the semantic Web community to produce and consume linked data, however little attention has been paid to monetization of linked data. In this paper we introduce a data marketplace – proDataMarket – that enables data providers to generate, advertise, and sell linked data, and data consumers to purchase linked data on the marketplace. The marketplace was originally designed with a focus on geospatial linked data (targeting property-related data providers and consumers) but its capabilities are generic and can be used for data in various domains. This demo will highlight the capabilities offered to the providers and consumers of the data made available on the marketplace.publishedVersio
Ideagrams: A digital tool for observing ideation processes
Purpose – The paper reports on an ongoing research project of TU Dresden Laboratory of Knowledge Architecture aiming the investigations of the traceability and visualization of upcoming ideas and topics within discussions. Communication and conversation analysis – to explore knowledge processes communication and interaction analyses emerged as a central scientific approach. Hereby knowledge creation and Knowledge Transfer are understood as collective and co-creative effort. Corresponding analysis tools and methods have been developed for the communication- and knowledge creation processes digital media extensively (Faraj et al 2011). However, research focusing on direct and immediate conversation, and not only based on digital media, rarely exists.
Development requirements – The existing tools for the analysis of digital communication data are yet not widely applied in the domain of spoken discussions. Whereas communication processes in the digital domain create their data automatically, the data from natural settings have to be extracted laboriously (Tonfoni 2004). Since there are no effective methods on data recording of voice communication yet existing, there are no strong and evident methods on computer aided conversation tracking and analysing existing too. The Ideagram tool tries to overcome this shortcoming.
Approach – A prototype of a transcription, visualization and analysis tool was designed, which is able to capture discussions by keywords and analyse them in real-time. The results are presented in several forms: histograms, semantic networks and mixtures between both. These visualizations allow identifying topic and concept dynamics, heuristic paths and creative moments. Central features of the discussion like knowledge communication, orientation for innovation and speech efficiency can be understood and designed. In the different figures - Ideagram - of spoken discussions the logged content is visualised. The program prototype counts the occurrence of the logged words. These can be marked within a chronological re-presentation graph and shows at what time which issue was discussed. By “peaks” and “valley’s” it is obviously visible where the talk was most or least active. The prototype tool allows analysing the used phrases according to their frequency and their appearance during the captured conversation.
Practical implications & Value – In contrast of conventional protocol and transcription techniques this kind of knowledge mining allows a greater information bandwidth and a more efficient access on core topics, thematic conflicts, idea generation etc. Experiences in very different settings created a very rich data set and allows to state that the application in business and science seems to very useful according to recording, analysing and deepening of spoken discussions. Hence, the Ideagram is still a prototype version and need further investigation and development
Bulk Majorons at Colliders
Lepton number violation may arise via the spontaneous breakdown of a global
symmetry. In extra dimensions, spontaneous lepton number violation in the bulk
implies the existence of a Goldstone boson, the majoron J^(0), as well as an
accompanying tower of Kaluza-Klein (KK) excitations, J^(n). Even if the
zero-mode majoron is very weakly interacting, so that detection in low-energy
processes is difficult, the sum over the tower of KK modes may partially
compensate in processes of relevance at high-energy colliders. Here we consider
the inclusive differential and total cross sections for e^- e^- --> W^- W^- J,
where J represents a sum over KK modes. We show that allowed parameter choices
exist for which this process may be accessible to a TeV-scale electron
collider.Comment: 11 pages LaTeX, 3 eps figures (references added
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