23 research outputs found
The Nature of Primordial Fluctuations from Anisotropic Inflation
We study the statistical nature of primordial fluctuations from an
anisotropic inflation which is realized by a vector field coupled to an
inflaton. We find a suitable gauge, which we call the canonical gauge, for
anisotropic inflation by generalizing the flat slicing gauge in conventional
isotropic inflation. Using the canonical gauge, we reveal the structure of the
couplings between curvature perturbations, vector waves, and gravitational
waves. We identify two sources of anisotropy, i.e. the anisotropy due to the
anisotropic expansion of the universe and that due to the anisotropic couplings
among variables. It turns out that the latter effect is dominant. Since the
coupling between the curvature perturbations and vector waves is the strongest
one, the statistical anisotropy in the curvature perturbations is larger than
that in gravitational waves. We find the cross correlation between the
curvature perturbations and gravitational waves which never occurs in
conventional inflation. We also find the linear polarization of gravitational
waves. Finally, we discuss cosmological implication of our results.Comment: 20 pages, 4 figures;(V2) a reference adde
Anisotropic Power-law Inflation
We study an inflationary scenario in supergravity model with a gauge kinetic
function. We find exact anisotropic power-law inflationary solutions when both
the potential function for an inflaton and the gauge kinetic function are
exponential type. The dynamical system analysis tells us that the anisotropic
power-law inflation is an attractor for a large parameter region.Comment: 14 pages, 1 figure. References added, minor corrections include
Pictures in clinical medicine. Huge apertures in the aortic valve due to Libman-Sachs endocarditis.
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Three-Phase Electrochemistry of a Highly Lipophilic Neutral Ru-Complex Having a Tridentate Bis(benzimidazolate)pyridine Ligand
Here we describe the
synthesis and electrochemical testing of a heteroleptic bis(tridentate) ruthenium(II) complex [RuII(LR)(L)]0
(LR =2,6-bis(1-(2-octyldodecan)benzimidazol-2-yl)pyridine, L = 2,6-bis(benzimidazolate)pyridine). It
is a neutral complex which undergoes a quasireversible oxidation and reduction
at relatively low potential. The newly synthetized compound was used for
studies of ion-transfer at the three-phase junction because of the sensitivity
of this method to cation expulsion. The [RuII(LR)(L)]0
shows exceptional stability during cycling and is sufficiently lipophilic even
after oxidation to persist in the organic phase also using very hydrophilic
anions such as Cl−. Given its low redox potential and strong
lipophilicity this compound will be of interest as an electron donor in
liquid-liquid electrochemistry