12,177 research outputs found
On Electrical Equivalence of Aperture-Body and Transmission-Cavity Resonance Phenomena in Subwavelength Conducting Aperture Systems from an Equivalent Circuit Point of View
For a narrow slit structure backed by a conducting strip which is taken as a
representative example of an aperture-body resonance (ABR) problem, the
transmission resonance condition (i.e., condition for maximum power
transmission) and the transmission width (i.e., normalized maximum transmitted
power through the slit) are found to be the same as those for narrow slit
coupling problem in a thick conducting screen, which is designated as a
transmission-cavity resonance (TCR) problem. From a viewpoint of equivalent
circuit representation for the transmission resonance condition and the
funneling mechanism, the ABR and the TCR problems are thought to be essentially
of the same nature.Comment: 14 pages, 3 figure
Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation
BICEP2 has observed a primordial gravitational wave corresponding to the
tensor-to-scalar ratio of 0.16. It seems to require a super-Planckian
inflationary model. In this paper, we propose a double hybrid inflation model,
where the inflaton potential dynamically changes with the evolution of the
inflaton fields. During the first phase of inflation over 7 e-folds, the power
spectrum can be almost constant by a large linear term in the hybrid potential,
which is responsible also for the large tensor-to-scalar ratio. In the second
phase of 50 e-folds, the dominant potential becomes dynamically changed to the
logarithmic form as in the ordinary supersymmetric hybrid inflation, which is
performed by the second inflaton field. In this model, the sub-Planckian field
values (~0.9 M_P) can still yield the correct cosmic observations with the
sufficient e-folds.Comment: 12 pages, 1 figure, version to appear in Phys. Lett.
X-ray line signal from decaying axino warm dark matter
We consider axino warm dark matter in a supersymmetric axion model with
R-parity violation. In this scenario, axino with the mass m_\axino\simeq 7
keV can decay into photon and neutrino resulting in the X-ray line signal at
keV, which might be the origin of unidentified X-ray emissions from
galaxy clusters and Andromeda galaxy detected by the XMM-Newton X-ray
observatory.Comment: 8 pages, 2 figures, typos corrected, discussion and one more figure
added, the final journal versio
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