Neutrino-pair bremsstrahlung by relativistic degenerate electrons in a neutron-star crust at densities 10 9 g cm ?3 < < 1:5 10 14 g cm ?3 is analyzed. The processes taken into account are neutrino emission due to Coulomb scattering of electrons by atomic nuclei in a Coulomb liquid, and electron-phonon scattering (the phonon contribution) and Bragg diiraction (the static-lattice contribution) in...

We compute the total radiated momentum carried by gravitational waves during scattering of two spinless black holes at lowest order in Newton's constant, $\mathcal{O}({G}^{3})$, and all orders velocity. By analytic continuation into bound state regime, we obtain $\mathcal{O}({G}^{3})$ energy loss elliptic orbits. This provides an essential step toward complete understanding third-post-Minkowski...

X-ray emission by sparks implies bremsstrahlung from a population of energetic electrons, but the details of this process remain a mystery. We present detailed statistical analysis of X-ray spectra detected by multiple detectors during sparks produced by 1 MV negative high-voltage pulses with 1 μs risetime. With over 900 shots, we statistically analyze the signals, assuming that the distributio...

In the region of large μ+μ− invariant mass, the decay spectrum of KL → μ +μ−γ deviates from the Dalitz pair spectrum, as a result of interference between conversion (KL → γ ∗γ → μ+μ−γ) and bremsstrahlung amplitudes. The latter is proportional to the KL → μ +μ− matrix element, whose 2γ-absorptive part appears to dominate the observed KL → μ +μ− decay rate. We examine the extent to which a scruti...

Abstract. We report the results of extracting the hard X-ray continuum spectrum of Cas A SNR from RXTE/PCA Target of Opportunity observations (TOO) and CGRO/OSSE observations. The data can rule out the single thermal bremsstrahlung model for Cas A continuum between 2 and 150 keV. The single power law model gives a mediocre fit (∼5%) to the data with a power-law index, Γ = 2.94±0.02. A model wit...