4,600 research outputs found
Phenomenology of left-right symmetric dark matter
We present a detailed study of dark matter phenomenology in low-scale
left-right symmetric models. Stability of new fermion or scalar multiplets is
ensured by an accidental matter parity that survives the spontaneous symmetry
breaking of the gauge group by scalar triplets. The relic abundance of these
particles is set by gauge interactions and gives rise to dark matter candidates
with masses above the electroweak scale. Dark matter annihilations are thus
modified by the Sommerfeld effect, not only in the early Universe, but also
today, for instance, in the Center of the Galaxy. Majorana candidates -
triplet, quintuplet, bi-doublet, and bi-triplet - bring only one new parameter
to the model, their mass, and are hence highly testable at colliders and
through astrophysical observations. Scalar candidates - doublet and 7-plet, the
latter being only stable at the renormalizable level - have additional
scalar-scalar interactions that give rise to rich phenomenology. The particles
under discussion share many features with the well-known candidates wino,
Higgsino, inert doublet scalar, sneutrino, and Minimal Dark Matter. In
particular, they all predict a large gamma-ray flux from dark matter
annihilations, which can be searched for with Cherenkov telescopes. We
furthermore discuss models with unequal left-right gauge couplings, , taking the recent experimental hints for a charged gauge boson with 2 TeV
mass as a benchmark point. In this case, the dark matter mass is determined by
the observed relic density.Comment: 32 + 23 pages, 4.5 MB; Minor changes and additional comments. Matches
published versio
Indirect searches of dark matter via polynomial spectral features
We derive the spectra arising from non-relativistic dark matter annihilations
or decays into intermediary particles with arbitrary spin, which subsequently
produce neutrinos or photons via two-body decays. Our approach is model
independent and predicts spectral features restricted to a kinematic box. The
overall shape within that box is a polynomial determined by the polarization of
the decaying particle. We illustrate our findings with two examples. First,
with the neutrino spectra arising from dark matter annihilations into the
massive Standard Model gauge bosons. Second, with the gamma-ray and neutrino
spectra generated by dark matter annihilations into hypothetical massive spin-2
particles. Our results are in particular applicable to the 750 GeV diphoton
excess observed at the LHC if interpreted as a spin-0 or spin-2 particle
coupled to dark matter. We also derive limits on the dark matter annihilation
cross section into this resonance from the non-observation of the associated
gamma-ray spectral features by the H.E.S.S. telescope.Comment: 19 pages, modified title, added references, minor changes. To appear
in JCA
2A Delivery
For students who want or need to learn how to count in binary and hexadecimal, the 2A Delivery Android application is a teaching tool that will help students learn by playing a game. This game will simulate a career with a fictional delivery company and will encourage the dedication of the student with pay raises, bonuses for great work, upgrades to vehicles, and map expansions. Unlike the current educational games available on the market, our product will use a storyline that will boost learning and stimulate the mind by teaching how to convert between multiple number bases
Quantum phase transition between one-channel and two-channel Kondo polarons
For a mobile spin-1/2 impurity, coupled antiferromagnetically to a
one-dimensional gas of fermions, perturbative ideas have been used to argue in
favor of two-channel Kondo behavior of the impurity spin. Here we combine
general considerations and extensive numerical simulations to show that the
problem displays a novel quantum phase transition between two-channel and
one-channel Kondo screening upon increasing the Kondo coupling. We construct a
ground-state phase diagram and discuss the various non-trivial crossovers as
well as possible experimental realizations.Comment: 5+4 pages, 5+3 fig
Quality Management and Improvement in the Spanish SME Food Industry: The Adoption of ISO 9000
This paper presents the results of a large-scale study in the Spanish F&DI aimed to identify the motivators, perceived costs, and benefits of implementing ISO 9000 standards. Results indicate the increasing importance of ISO 9000 standards as a strategic tool in the Spanish F&DI with an increasing number of F&D companies seeking ISO 9000 certification. Despite being a recent strategic option among Spanish F&D companies latest figures show a total of 1,754 firms being ISO 9000 certified (a significant increased from a total of 4 firms in 1993)ISO 9000 certification, food industry, Spain, performance, Agribusiness,
A Low-cost, Long-range, and Solar-based IoT Soil Quality Monitor
The project objective is to create a low-cost, long-range, and solar-based IoT soil quality monitoring system. The system must transmit packages of data gathered from separate nodes, consisting of two different types of sensors, to a centralized gateway receiver to be displayed to the user in an elegant and readable manner. The end goal of the project is to supplement produce grown by large agricultural bodies around the United States without the misuse of water resources. This report presents the need for this system, details the components of the system, and the rationale behind design choices. It serves as a comprehensive guide to all the work that has been completed, provides an outlook for future iterations, and demonstrates the viability of LoRa communication for low power packet sending in a rural environment
The development of an analytical tool for integrating 'the voice of the consumer' in new product development
The development of new products and how the process is organised and managed within the firm is a key area in management research due to the high failure rate of new products and the consequent waste of limited resources. Developing new products and being innovative requires companies to have deep understanding of the consumer, the market and the environment but most importantly to effectively apply this knowledge in the development of new products that meet consumer's expectations. This paper aims at developing an innovative framework to incorporate the 'voice of consumer' at early stages of the new product development (NPD) process. To that end, the paper will consider the practical implementation of the Quality Function Deployment (QFD) in the development of new food products. QFD is considered as the most complete and comprehensive methodology for planning the goals of a stream of processes in order to align them with customer's requirements. QFD forces the design team to place customer needs in first place and ensures that this customer focus is kept through the NPD process. In doing so, QFD reduces two types of risks: first, the non- correspondence between product specifications and the wants of a predetermined target consumer group; and second, the risk that final products do not comply with product specifications. To date, QFD has been partially applied in the food area with only a handful of studies venturing in this research area.quality function deployment, new product development, voice of consumer., Consumer/Household Economics, Demand and Price Analysis,
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