37,578 research outputs found
Discrete Scale Relativity And SX Phoenicis Variable Stars
Discrete Scale Relativity proposes a new symmetry principle called discrete
cosmological self-similarity which relates each class of systems and phenomena
on a given Scale of nature's discrete cosmological hierarchy to the equivalent
class of analogue systems and phenomena on any other Scale. The new symmetry
principle can be understood in terms of discrete scale invariance involving the
spatial, temporal and dynamic parameters of all systems and phenomena. This new
paradigm predicts a rigorous discrete self-similarity between Stellar Scale
variable stars and Atomic Scale excited atoms undergoing energy-level
transitions and sub-threshold oscillations. Previously, methods for
demonstrating and testing the proposed symmetry principle have been applied to
RR Lyrae, Delta Scuti and ZZ Ceti variable stars. In the present paper we apply
the same analytical methods and diagnostic tests to a new class of variable
stars: SX Phoenicis variables. Double-mode pulsators are shown to provide an
especially useful means of testing the uniqueness and rigor of the conceptual
principles and discrete self-similar scaling of Discrete Scale Relativity.Comment: 16 pages, 2 tables, comments welcom
Feedback-free optical cavity with self-resonating mechanism
We demonstrated the operation of a high finesse optical cavity without
utilizing an active feedback system to stabilize the resonance. The effective
finesse, which is a finesse including the overall system performance, of the
cavity was measured to be , and the laser power stored in
the cavity was kW, which is approximately 187,000 times greater
than the incident power to the cavity. The stored power was stabilized with a
fluctuation of , and we confirmed continuous cavity operation for more
than two hours. This result has the potential to trigger an innovative
evolution for applications that use optical resonant cavities such as compact
photon sources with laser-Compton scattering or cavity enhanced absorption
spectroscopy.Comment: 5 pages, 7 figure
Robot control with biological cells
At present there exists a large gap in size, performance, adaptability and robustness between natural and artificial information processors for performing coherent perception-action tasks under real-time constraints. Even the simplest organisms have an enviable capability of coping with an unknown dynamic environment. Robots, in contrast, are still clumsy if confronted with such complexity. This paper presents a bio-hybrid architecture developed for exploring an alternate approach to the control of autonomous robots. Circuits prepared from amoeboid plasmodia of the slime mold Physarum polycephalum are interfaced with an omnidirectional hexapod robot. Sensory signals from the macro-physical environment of the robot are transduced to cellular scale and processed using the unique micro-physical features of intracellular information processing. Conversely, the response form the cellular computation is amplified to yield a macroscopic output action in the environment mediated through the robotās actuators
Heterogeneity Induced Order in Globally Coupled Chaotic Systems
Collective behavior is studied in globally coupled maps with distributed
nonlinearity. It is shown that the heterogeneity enhances regularity in the
collective dynamics. Low-dimensional quasiperiodic motion is often found for
the mean-field, even if each element shows chaotic dynamics. The mechanism of
this order is due to the formation of an internal bifurcation structure, and
the self-consistent dynamics between the structures and the mean-field.
Keywords: Globally Coupled Map with heterogeneity, Collective behaviorComment: 11 pages (Revtex) + 4 figures (PostScript,tar+gzip
Collective Neutrino Oscillations
We review the rich phenomena associated with neutrino flavor transformation
in the presence of neutrino self-coupling. Our exposition centers on three
collective neutrino oscillation scenarios: a simple bipolar neutrino system
that initially consists of mono-energetic electron neutrinos and antineutrinos;
a homogeneous and isotropic neutrino gas with multiple neutrino/antineutrino
species and continuous energy spectra; and a generic neutrino gas in an
anisotropic environment. We use each of these scenarios to illustrate key
facets of collective neutrino oscillations. We discuss the implications of
collective neutrino flavor oscillations for core collapse supernova physics and
for the prospects of obtaining fundamental neutrino properties, e.g., the
neutrino mass hierarchy and from a future observed supernova
neutrino signal.Comment: Submitted to Annual Review of Nuclear and Particle Scienc
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