15,186 research outputs found
The NPFIT strategy for information security of care record service
The National Programme for IT in England doesn’t have a one-document strategy for its information security of the Care Records Service, which is the national EHR system. This paper provides a comprehensive understanding of the information security strategy of England’s EHR system by presenting its different information security issues such as consent mechanisms, access control, sharing level, and related legal and regulations documents
MSSM4G: Reviving Bino Dark Matter with Vector-like 4th Generation Particles
We supplement the minimal supersymmetric standard model (MSSM) with
vector-like copies of standard model particles. Such 4th generation particles
can raise the Higgs boson mass to the observed value without requiring very
heavy superpartners, improving naturalness and the prospects for discovering
supersymmetry at the LHC. Here we show that these new particles are also
motivated cosmologically: in the MSSM, pure Bino dark matter typically
overcloses the Universe, but 4th generation particles open up new annihilation
channels, allowing Binos to have the correct thermal relic density without
resonances or co-annihilation. We show that this can be done in a sizable
region of parameter space while preserving gauge coupling unification and
satisfying constraints from collider, Higgs, precision electroweak, and flavor
physics.Comment: 16 pages, 3 figure
Nonequilibrium quantum fluctuations of a dispersive medium: Spontaneous emission, photon statistics, entropy generation, and stochastic motion
We study the implications of quantum fluctuations of a dispersive medium,
under steady rotation, either in or out of thermal equilibrium with its
environment. A rotating object exhibits a quantum instability by dissipating
its mechanical motion via spontaneous emission of photons, as well as internal
heat generation. Universal relations are derived for the radiated energy and
angular momentum as trace formulas involving the object's scattering matrix. We
also compute the quantum noise by deriving the full statistics of the radiated
photons out of thermal and/or dynamic equilibrium. The (entanglement) entropy
generation is quantified, and the total entropy is shown to be always
increasing. Furthermore, we derive a Fokker-Planck equation governing the
stochastic angular motion resulting from the fluctuating back-reaction
frictional torque. As a result, we find a quantum limit on the uncertainty of
the object's angular velocity in steady rotation. Finally, we show in some
detail that a rotating object drags nearby objects, making them spin parallel
to its axis of rotation. A scalar toy model is introduced in the first part to
simplify the technicalities and ease the conceptual complexities; a detailed
discussion of quantum electrodynamics is presented in the second part
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