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In this paper, we investigate and analyze the cosmological dynamics of the universe, with an effect of modified f(R) gravity emerging at cosmological scale. We choose the Einstein frame as a physical frame. We consider phase portraits of the universe at the late time from modified f(R) gravity model. This result gives our universe an acceleration phase expansion without introducing existence of...

A gravity model, frequently used to explain trade patterns, is used to explain stock market correlations. The main result of the trade literature is that geography matters for goods markets. Physical location and trading costs should be less of an issue in asset markets. However we find that geographical variables still matter when examining equity market linkages. In particular, the number of ...

We study gravity localization in the context of a six-dimensional gravity model coupled with complex scalar fields. With a supergravity-motivated scalar potential, we show that the domain wall junction solutions localize a four-dimensional massless graviton under an assumption on the wall profile. We find that unlike the global supersymmetric model, contributions to the junction tension cancel ...

the gravity method is one of the first geophysical techniques used in oil and gas exploration. an algorithm is developed for a fast quantitative interpretation of gravity data generated by geometrically simple but also the estimated depths and other model parameters of a buried structure. following abdelrahman et al (1989). the general gravity anomaly expression produced by a sphere, an infinit...

We propose a simple higher-derivative braneworld gravity model which contains a stable accelerating branch, in the absence of cosmological constant or potential, that can be used to describe the late time cosmic acceleration. This model has similar qualitative features to that of Dvali-Gabadadze-Porrati, such as the recovery of four-dimensional gravity at subhorizon scales, but unlike that case...

We show that a gravity model explains international transactions in "nancial assets at least as well as goods trade transactions. Our results support the hypothesis that informational asymmetries are responsible for the strong negative relationship between asset trade and distance. This result is very important for theories of asset trade, portfolio adjustments and home bias. We strengthen it b...

This paper investigates how well the gravity model explains various cross-border flows that may lead to knowledge spillovers. It turns out that the model works well for trade and telephone traffic, but less satisfactorily for merger and acquisition flows. © 2007 Elsevier B.V. All rights reserved.

We study neutrino physics in the context of the localized gravity model with nonfactorizable metric proposed by Randall and Sundrum. Identifying the right-handed neutrino with a bulk fermion zero mode, which can be localized on the “hidden” 3-brane in the Randall–Sundrum model, we obtain naturally small Dirac neutrino masses without invoking a see-saw mechanism. Our model predicts a strong hier...