22,992 research outputs found
Hidden symmetry of the quantum Calogero-Moser system
Hidden symmetry of the quantum Calogero-Moser system with the inverse-square
potential is explicitly demonstrated in algebraic sense. We find the underlying
algebra explaining the super-integrability phenomenon for this system.
Applications to related multi-variable Bessel functions are also discussed.Comment: 16 pages, latex, no figure
750 GeV Diphotons from a D3-brane
Motivated by the recently reported diphoton excess at 750 GeV observed by
both CMS and ATLAS, we study string-based particle physics models which can
accommodate this signal. Quite remarkably, although Grand Unified Theories in
F-theory tend to impose tight restrictions on candidate extra sectors, the case
of a probe D3-brane near an E-type Yukawa point naturally leads to a class of
strongly coupled models capable of accommodating the observed signature. In
these models, the visible sector is realized by intersecting 7-branes, and the
750 GeV resonance is a scalar modulus associated with motion of the D3-brane in
the direction transverse to the Standard Model 7-branes. Integrating out heavy
3-7 string messenger states leads to dimension five operators for gluon fusion
production and diphoton decays. Due to the unified structure of interactions,
these models also predict that there should be additional decay channels to ZZ
and Z gamma. We also comment on models with distorted unification, where both
the production mechanism and decay channels can differ.Comment: v3: 12 pages, 1 figure, clarifications adde
Radio frequency baseband recording technique
Technique uses a helical-scan video recorder with auxiliary signal-conditioning equipment to provide an inexpensive, high-capacity magnetic tape recording of a 112 channel, phase-locked, multiplexed, baseband signal
“Forty-Seven Days: How Pershing’s Warriors Came of Age to Defeat the German Army in World War I (Book Review)” by Mitchell Yockelson
Review of Forty-Seven Days: How Pershing’s Warriors Came of Age to Defeat the German Army in World War I by Mitchell Yockelso
Particle Physics Implications of F-theory
We review recent progress in realizing Grand Unified Theories (GUTs) in a
strongly coupled formulation of type IIB string theory known as F-theory. Our
main emphasis is on the expected low-energy phenomenology of a minimal class of
F-theory GUTs. We introduce the primary ingredients in such constructions, and
then present qualitative features of GUT models in this framework such as GUT
breaking, doublet-triplet splitting, and proton decay. Next, we review
proposals for realizing flavor hierarchies in the quark and lepton sectors. We
discuss possible supersymmetry breaking scenarios, and their consequences for
experiment, as well as geometrically minimal realizations of F-theory GUTs
which incorporate most of these features.Comment: v2: 42 pages, 3 figures, submitted to Annu. Rev. Nuc. Part. Sci,
improved formatting and small clarification
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