3,585 research outputs found
\delta N versus covariant perturbative approach to non-Gaussianity outside the horizon in multifield inflation
We compute the super-Hubble evolution of non-Gaussianity of primordial
curvature perturbations in two-field inflation models by employing two
formalisms: delta N and covariant formalisms. Although two formalisms treat the
evolution of fluctuations radically different, we show that the formulas of
f_{NL} parameter agree quantitatively with each other within 1 % accuracy. We
analytically find that the amplitude of f_{NL} decays no faster than a^{-3} as
the inflationary trajectory reaches to the adiabatic limit for generic
potentials.Comment: v4: minor changes, version accepted for PRD; v3: 10 pages, 14
figures, added two examples that produce relatively large non-Gaussianity in
Appendix to support the results; v2: 8 pages, 10 figures, added reference
Finite Anomalous Magnetic Moment in the Gauge-Higgs Unification
We show that the anomalous magnetic moment of fermion in the gauge-Higgs
unification is finite in any spacetime dimensions, which is a new predictive
physical observable similar to the Higgs mass.Comment: 12 pages, 2 eps files, final version to appear in PR
Hydrodynamic collective effects of active proteins in biological membranes
Lipid bilayers forming biological membranes are known to behave as viscous 2D
fluids on submicrometer scales; usually they contain a large number of active
protein inclusions. Recently, it has been shown [Proc. Nat. Acad. Sci. USA 112,
E3639 (2015)] that such active proteins should in- duce non-thermal fluctuating
lipid flows leading to diffusion enhancement and chemotaxis-like drift for
passive inclusions in biomembranes. Here, a detailed analytical and numerical
investigation of such effects is performed. The attention is focused on the
situations when proteins are concentrated within lipid rafts. We demonstrate
that passive particles tend to become attracted by active rafts and are
accumulated inside them.Comment: 12 pages, 7 figure
On the scalar graviton in n-DBI gravity
n-DBI gravity is a gravitational theory which yields near de Sitter inflation
spontaneously at the cost of breaking Lorentz invariance by a preferred choice
of foliation. We show that this breakdown endows n-DBI gravity with one extra
physical gravitational degree of freedom: a scalar graviton. Its existence is
established by Dirac's theory of constrained systems. Firstly, studying scalar
perturbations around Minkowski space-time, we show that there exists one scalar
degree of freedom and identify it in terms of the metric perturbations. Then, a
general analysis is made in the canonical formalism, using ADM variables. It is
useful to introduce an auxiliary scalar field, which allows recasting n-DBI
gravity in an Einstein-Hilbert form but in a Jordan frame. Identifying the
constraints and their classes we confirm the existence of an extra degree of
freedom in the full theory, besides the two usual tensorial modes of the
graviton. We then argue that, unlike the case of (the original proposal for)
Horava-Lifschitz gravity, there is no evidence that the extra degree of freedom
originates pathologies, such as vanishing lapse, instabilities and strong
self-coupling at low energy scales.Comment: 30 pages, 1 figur
RECENT FOOD CONSUMPTION PATTERN OF JAPANESE HOUSEHOLDS: DRIVING FORCES BEHIND WESTERNIZATION
A complete demand system for 11 aggregated food categories with 24 demographic variables, is specified following QUAIDS and is estimated using Japanese household level data. The estimation results suggest that westernization is due to the income effect and the tendency is further enhanced by the demographic factors.Food Consumption/Nutrition/Food Safety,
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