1,964 research outputs found
Mythemesis: The Human Way of Knowing and Believing
Although science, philosophy, literature, and religion each have a different way of formulating explanations, they are all telling stories of why and how. The author describes how the human propensity to seek explanation through narrative can he understood as the product of an embodied mind. He offers a hypothesis ( \"mythemesis\" ) to explain the process and goes on to show that it may provide an opportunity to reduce scientific-religious conflict by transcending the dichotomy between first- and third-person modes of experience
CMOS VLSI design technology research
Issued as Report, Project no. E-21-622 (includes E-21-612
CoGeNT, DAMA, and Light Neutralino Dark Matter
Recent observations by the CoGeNT collaboration (as well as long standing
observations by DAMA/LIBRA) suggest the presence of a -10 GeV dark
matter particle with a somewhat large elastic scattering cross section with
nucleons ( cm).Within the context of the minimal
supersymmetric standard model (MSSM), neutralinos in this mass range are not
able to possess such large cross sections, and would be overproduced in the
early universe. Simple extensions of the MSSM, however, can easily accommodate
these observations. In particular, the extension of the MSSM by a chiral
singlet superfield allows for the possibility that the dark matter is made up
of a light singlino that interacts with nucleons largely through the exchange
of a fairly light (30-70 GeV) singlet-like scalar higgs, \hi. Such a
scenario is consistent with all current collider constraints and can generate
the signals reported by CoGeNT and DAMA/LIBRA. Furthermore, there is a generic
limit of the extended model in which there is a singlet-like pseudoscalar
higgs, \ai, with \mai\sim \mhi and in which the and b\anti
b, s\anti s coupling magnitudes of the \hi and \ai are very similar. In
this case, the thermal relic abundance is automatically consistent with the
measured density of dark matter if \mchi is sufficiently small that
\chi^0\chi^0\to b\anti b is forbidden.Comment: 6 pages, published versio
Where Do Riders Park Dockless, Shared Electric Scooters? Findings from San Jose, California
Dockless, shared, electric kick-scooters started popping up on U.S. city streets without warning in 2017. Reaction to the shared scooters came swiftly and strongly. On the one hand, the scooters have proven popular with riders, attracting investment capital and expanding service to additional cities. But others have been less enthusiastic, with a central complaint being how shared scooters are parked. This perspective explores the extent to which parked shared scooters pose a problem to others on streets, sidewalks, and public spaces, using empirical evidence documenting where scooters have been parked in downtown San Jose, California
Light Neutralino Dark Matter in the NMSSM
Neutralino dark matter is generally assumed to be relatively heavy, with a
mass near the electroweak scale. This does not necessarily need to be the case,
however. In the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and other
supersymmetric models with an extended Higgs sector, a very light CP-odd Higgs
boson can naturally arise making it possible for a very light neutralino to
annihilate efficiently enough to avoid being overproduced in the early
Universe.
In this article, we explore the characteristics of a supersymmetric model
needed to include a very light neutralino, 100 MeV < \mcnone < 20 GeV, using
the NMSSM as a prototype. We discuss the most important constraints from
Upsilon decays, , and the magnetic moment
of the muon, and find that a light bino or singlino neutralino is allowed, and
can be generated with the appropriate relic density.
It has previously been shown that the positive detection of dark matter
claimed by the DAMA collaboration can be reconciled with other direct dark
matter experiments such as CDMS II if the dark matter particle is rather light,
between about 6 and 9 GeV. A singlino or bino-like neutralino could easily fall
within this range of masses within the NMSSM. Additionally, models with sub-GeV
neutralinos may be capable of generating the 511 keV gamma-ray emission
observed from the galactic bulge by the INTEGRAL/SPI experiment.
We also point out measurements which can be performed immediately at CLEO,
BaBar and Belle using existing data to discover or significantly constrain this
scenario.Comment: References updated, accepted for publication in PR
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