The Hamilton–Jacobi analysis for higher-order Chern–Simons gravity

Higher-order spectral analysis of nonlinear ocean surface gravity 'waves

Bispectral and trispectral analyses are used to detect secondary and tertiary wave components resulting from nonlinear interactions among largeamplitude ocean surface gravity waves in 8and 13-m water depths. Bispectra of bottom-pressure measurements indicate forced secondary waves at frequencies 2fp about twice the primary power spectral peak frequency fp. However, the interpretation of the bis...

Symmetries of higher-order string gravity actions

In this paper we explicitly prove the invariance of the time-dependent string gravity Lagrangian with up to four derivatives under the global O(d, d) symmetry. CERN-TH/96-291 October 1996 Partially supported by a Polish KBN grant. Permanent address: Institute for Theoretical Physics, Hoża 69, 00-689 Warszawa, Poland. E-mail: [email protected]

The Effective Cosmological Constant in Higher Order Gravity Theories

Fundamental issues as the determination of gravity vacuum state, the mechanism which led the early universe to the today observed large scale structures, and the prediction of what will be the fate of the whole universe are all connected to the determination of cosmological constant. Besides, from several points of view, it seems that Einstein’s theory of gravity must be generalized to higher–o...

Almost–homogeneity of the Universe in Higher–order Gravity

In the R+αR gravity theory, we show that if freely propagating massless particles have an almost isotropic distribution, then the spacetime is almost Friedmann–Robertson– Walker (FRW). This extends the result proved recently in general relativity (α = 0), which is applicable to the microwave background after photon decoupling. The higher– order result is in principle applicable to a massless sp...

Higher order Fourier analysis