62,107 research outputs found
Risk aversion in economic transactions
Most people are risk-averse (risk-seeking) when they expect to gain (lose).
Based on a generalization of ``expected utility theory'' which takes this into
account, we introduce an automaton mimicking the dynamics of economic
operations. Each operator is characterized by a parameter q which gauges
people's attitude under risky choices; this index q is in fact the entropic one
which plays a central role in nonextensive statistical mechanics. Different
long term patterns of average asset redistribution are observed according to
the distribution of parameter q (chosen once for ever for each operator) and
the rules (e.g., the probabilities involved in the gamble and the indebtedness
restrictions) governing the values that are exchanged in the transactions.
Analytical and numerical results are discussed in terms of how the sensitivity
to risk affects the dynamics of economic transactions.Comment: 4 PS figures, to appear in Europhys. Let
Diphoton decay for a 750 GeV scalar boson in a model
We propose a new GUT model free from anomalies, with
a 750 GeV scalar candidate which can decay into two photons, compatible with
the recent diphoton signal reported by ATLAS and CMS collaborations. This model
gives masses to all fermions and may explain the 750GeV signal through one loop
decays to with charged vector and charged Higgs bosons, as well
as up- and electron-like exotic particles that arise naturally from the
condition of cancellation of anomalies of the group. We
obtain, for different width approximations, allowed mass regions from 900 GeV
to 3 TeV for the exotic up-like quark, in agreement with ATLAS and CMS
collaborations data.Comment: 4 figures, discussion extended, 1 new figur
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Optimized Multimode Interference Fiber Based Refractometer in A Reflective Interrogation Scheme
A fiber based refractometer in a reflective interrogation scheme is investigated and optimized. A thin gold film was deposited on the tip of a coreless fiber section, which is spliced with a single mode fiber. The coreless fiber is a multimode waveguide, and the observed effects are due to multimode interference. To investigate and optimize the structure, the multimode part of the sensor is built with 3 different lengths: 58 mm, 29 mm and 17 mm. We use a broadband light source ranging from 1475 nm to 1650 nm and we test the sensors with liquids of varying refractive indices, from 1.333 to 1.438. Our results show that for a fixed wavelength, the sensor sensitivity is independent of the multimode fiber length, but we observed a sensitivity increase of approximately 0.7 nm/RIU for a one-nanometer increase in wavelength
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