Much recent work on the cosmic microwave background (CMB) has focussed on the angular power spectrum of temperature anisotropies and particularly on the recovery of cosmological parameters from acoustic peaks in the power spectrum. However, there is more that can conceivably be done with CMB measurements. Here I briefly survey a few such ideas: cross-correlation with other cosmic backgrounds as...

We reconsider the Alcock-Paczyński effect on 21cm fluctuations from high redshift, focusing on the 21cm power spectrum. We show that at each accessible redshift both the angular diameter distance and the Hubble constant can be determined from the power spectrum. Furthermore, this is possible using anisotropies that depend only on linear density perturbations and not on astrophysical sources of ...

This paper experimentally studies and models the angulardelay power spectrum density at the mobile station based on the sitespecific measurement in a macrocell in urban area of Tokyo. The authors first show the azimuth power spectral density at the mobile station. It is decomposed into the “classes” which represent specific contributions within limited azimuth range, as well as the residual. Th...

We study an inflationary model where two decoupled string axions drive inflation. The number of e-folds is dependent on the energy scale and the decay constant, but is almost independent of the angular component in spite of the rich geometry of the moduli space. This suppresses the nearly scale-invariant spectrum of the isocurvature perturbations, making the power spectrum of the primordial den...

If a single sterile neutrino exists such that mνs ∼ 11eV , it can serendipitously solve all outstanding issues of the Modified Newtonian Dynamics. With it one can explain the dark matter of galaxy clusters without influencing individual galaxies, match the angular power spectrum of the cosmic microwave background and potentially fit the matter power spectrum. This model is flat with Ωνs ∼ 0.23 ...

We study the properties of chaos in spinning-particle motions in Schwarzschild spacetime. We characterize the chaos in the motions using the power spectrum. We discover that the power spectrum shows not only white noise but also 1/f type fluctuation, depending on the value of the spin and the angular momentum of the test particle. We obtain the phase diagram for the properties of the chaos. Fur...

A controllable energy method, which considers the undersampling issue of transfer function and valid spectral a source signal, is proposed to implement angular spectrum diffraction calculation in near far fields. The method provides an optimized frequency boundary fCE within it always keeps be diffracted. significantly reduces number samples while having same accuracy as previous methods, imply...