3,447 research outputs found
Multiple Scales in Pati-Salam Unification Models
We investigate models where gauge unification (GUT) proceeds in steps that
include Pati-Salam symmetry. Beyond the Standard Model, we allow for a
well-defined set of small representations of the GUT gauge group. We show that
all possible chains of Pati-Salam symmetry breaking can be realized in
accordance with gauge-coupling unification. We identify, in particular, models
with unification near the Planck scale, with intermediate left-right or SU(4)
quark-lepton symmetries that are relevant for flavor physics, with new colored
particles at accessible energies, and with an enlarged electroweak Higgs
sector. We look both at supersymmetric and non-supersymmetric scenarios.Comment: 48 pages, 11 figures, version accepted for publication in JHE
Combining Pati-Salam and Flavour Symmetries
We construct an extension of the Standard Model (SM) which is based on grand
unification with Pati-Salam symmetry. The setup is supplemented with the idea
of spontaneous flavour symmetry breaking which is mediated through flavon
fields with renormalizable couplings to new heavy fermions. While we argue that
the new gauge bosons in this approach can be sufficiently heavy to be
irrelevant at low energies, the fermionic partners of the SM quarks, in
particular those for the third generation, can be relatively light and provide
new sources of flavour violation. The size of the effects is constrained by the
observed values of the SM Yukawa matrices, but in a way that is different from
the standard minimal-flavour violation approach. We determine characteristic
deviations from the SM that could eventually be observed in future precision
measurements.Comment: 26 pages, 5 figure
Government and Social Media: A Case Study of 31 Informational World Cities
Social media platforms are increasingly being used by governments to foster
user interaction. Particularly in cities with enhanced ICT infrastructures
(i.e., Informational World Cities) and high internet penetration rates, social
media platforms are valuable tools for reaching high numbers of citizens. This
empirical investigation of 31 Informational World Cities will provide an
overview of social media services used for governmental purposes, of their
popularity among governments, and of their usage intensity in broadcasting
information online.Comment: In Proceedings of the 47th Hawaii International Conference on System
Sciences (pp. 1715-1724). IEEE Computer Society, 201
On the mechanism of action of the cytostatic drug anguidine and of the immunosuppressive agent ovalicin, two sesquiterpenes from fungi
РЕЗУЛЬТАТы ЭКСПЕРИМЕНТАЛЬНыХ ИССЛЕДОВАНИЙ ВыСШИХ ГАРМОНИЧЕСКИХ СОСТАВЛЯЮЩИХ В СИСТЕМЕ ЭЛЕКТРО-СНАБЖЕНИЯ ШАХТы ИМ. "ГЕРОЕВ КОСМОСА"
Викладено основні результати спостережень та їх короткий аналіз. Частково розкрита проблема електромагнітної сумісності в системі електропостачання шахти ім. Героїв Космосу. Відзначено появу вищіх гармонік та їх джерела а також причини винекнення резонансних явищ. Обгрунтовано необхідність проведення моніторінгу показників якості електроенергії з метою підвищення ефективності її використання
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