We present a measurement of the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148 GHz. The measurement uses maps with 1.′4 angular resolution made with data from the Atacama Cosmology Telescope (ACT). The observations cover 228 deg2 of the southern sky, in a 4. ◦2 wide strip centered on declination 53◦ south. The CMB at arcminute angular scales is particu...

High-energy photons from pair annihilation of dark matter particles contribute to the cosmic gamma-ray background (CGB) observed in a wide energy range. Since dark matter particles are weakly interacting, annihilation can happen only in high density regions such as dark matter halos. The precise shape of the energy spectrum of CGB depends on the nature of dark matter particles — their mass and ...

We explore the possibility that a multiple-stage inflationary scenario based on supersymmetric GUT models, can account for the break at kb ≃ 0.05 h Mpc −1 in the power spectrum of galaxy clustering, while it reproduces the angular power spectrum of cosmic microwave background anisotropies.

It is demonstrated that omega(-4/3) law of the power spectrum, with the angular frequency omega in dissipative flows, is produced by the emission of dispersive waves from the antikink of an congested domain. The analytic theory predicts that the spectrum is proportional to omega(-2) for relatively low frequency and omega(-4/3) for high frequency.

We provide a simple toy model to elucidate the effects of baryonic cooling on predictions of the convergence power spectrum in weak gravitational lensing. Our model suggests that the effects of baryonic cooling on dark matter halo profiles can alter the dark matter power spectrum at k ∼ 10hMpc and lead to percent level changes in the convergence angular power spectrum at wavenumbers of several ...

It is well known that velocities does not commute in presence of an electromagnetic field. This property implies that angular algebra symmetries, such as the sO(3) and Lorentz algebra symmetries, are broken. To restore these angular symmetries we show the necessity of adding the Poincaré momentum M to the simple angular momentum L. These restorations performed succesively in a flat space and in...

A major application of optics is imaging all types of structural, physical, chemical and biological features of matter. Techniques based on most known properties of light have been developed over the years to remotely acquire information about such features. They include the spin angular momentum, encoded in the polarization, but not yet the orbital angular momentum encoded in its spiral spectr...

We discuss simulated energy and angular spectra of electrons lost to the vacuum chamber wall during beam-induced multipacting in SPS and LHC. Our simulations demonstrate that electron energies and impact angles are strongly correlated, and that the angular distribution can be modified by the beam magnetic field. The energy spectrum is found to be remarkably sensitive to changes in the bunch len...

Observational evidence for the presence of a preferred scale around 100 Mpc in the distribution of high-density regions in the Universe is summarised. Toy models with various degrees of regularity are analysed to understand better the observational data. Predictions of models which produce a feature on the initial power spectrum of matter are analysed and compared with new observational data on...