Orbital angular momentum (OAM) spectrum diagnosis is a fundamental building block for diverse OAM-based systems. Among others, the simple on-axis interferometric measurement can retrieve amplitude and phase information of complex OAM spectra in few shots. Yet, its single-shot retrieval remains elusive, due to signal–signal beat interference inherent measurement. Here, we introduce concept Krame...

High-energy photons from pair annihilation of dark matter particles contribute to the cosmic gamma-ray background (CGB) observed in a wide energy range. The precise shape of the energy spectrum of CGB depends on the nature of dark matter particles. In order to discriminate between the signals from dark matter annihilation and other astrophysical sources, however, the information from the energy...

It is now well known that mode-coupling effects associated with certain secondary effects generate higher order correlations in cosmic microwave background ~CMB! temperature anisotropies, beyond the two-point function. In order to extract such a non-Gaussian signal at the three-point level, we suggest a two-point statistic in the form of an angular power spectrum involving correlations between ...

We use hydrodynamical simulations to assess the impact of radiative cooling and ‘pre-heating’ on predictions for the Sunyaev–Zel’dovich (SZ) effect. We find that cooling significantly reduces both the mean SZ signal and its angular power spectrum. Pre-heating can give a higher mean distortion, while leaving the angular power spectrum below that found in a simulation without heating or cooling. ...

We use hydrodynamical simulations to assess the impact of radiative cooling and “preheating” on predictions for the Sunyaev-Zeldovich (SZ) effect. Cooling significantly reduces both the mean SZ signal and its angular power spectrum, while preheating can increase the mean distortion while leaving the angular power spectrum below that found in a simulation without heating or cooling. We study the...