We study the absorption of massive spin-half particles by a small Schwarzschild black hole by numerically solving the single-particle Dirac equation in Painlevé–Gullstrand coordinates. We calculate the absorption cross section σ(E) for a range of gravitational couplings Mm/mP 2 and incident particle energies E. At high couplings, where the Schwarzschild radius RS is much greater than the wavele...

Supermassive black holes appear to be uniquely associated with galactic bulges. The mean ratio of black hole mass to bulge mass was until recently very uncertain, with ground based, stellar kinematical data giving a value for 〈M•/Mbulge〉 roughly an order of magnitude larger than other techniques. The discrepancy was resolved with the discovery of the M• − σ relation, which simultaneously establ...

We used the widths of Hβ and [OIII] emission lines to investigate the black hole–bulge relation in radio-loud AGNs, radio-quiet AGNs and NLS1s. The central black hole mass, Mbh, is estimated from the Hβ line width and the optical luminosity, and the bulge velocity dispersion, σ, is directly from the width of [OIII] line. We found that the radio-quiet AGNs follow the established Mbh − σ relation...

Recent numerical simulations of the fragmentation of primordial molecular clouds in hierarchical cosmogonies have suggested that the very first stars (the so–called Population III) may have been rather massive. Here we point out that a numerous population of massive black holes (MBHs) – with masses intermediate between those of stellar and supermassive holes – may be the endproduct of such an e...

Organic/inorganic thermoelectric hybrids demonstrate great potential for wearable applications. However, their scalability is hindered by an inferior power factor (S2σ). Nowadays, achieving deep optimization of S2σ necessitates a strategy to decouple the Seebeck coefficient (S) and electrical conductivity (σ). In this work, we propose break coupling between S σ constructing Schottky interface t...

We discuss the role of strangeness in dense matter and especially in neutron stars. The early (in density) introduction of hyperons found in many calculations is probably delayed by the decrease in vector mean field acting on the neutron. This decrease results from both conventional many-body rescattering effects and from the movement towards asymptotic freedom at high densities. Subthreshold K...

Eddington outflows probably regulate the growth of supermassive black holes (SMBHs) in active galactic nucleus (AGN). I show that effect of the Rayleigh–Taylor instability on these outflows means that SMBH masses are likely to be a factor of a few below the M–σ relation in AGN. This agrees with the suggestion by Batcheldor that the M–σ relation defines an upper limit to the black hole mass. I f...

Based on the microscopic model including spin-orbit coupling, on-site Coulomb and Hund’s interactions, as well as crystal field effects, we have investigated magnetic and optical properties of Sr2IrO4. Taking into account all intermediate state multiplets generated by virtual hoppings of electrons, we calculated the isotropic, pseudodipolar, and Dzyaloshinsky-Moriya coupling constants, which de...

The coalescence of massive black hole (BH) binaries due to galaxy mergers provides a primary source of low-frequency gravitational radiation detectable by pulsar timing measurements and by the proposed LISA (Laser Interferometry Space Antenna) observatory. We compute the expected gravitational radiation signal from sources at all redshifts by combining the predicted merger rate of galactic halo...

Halogen bonding (XB) is being extensively explored for its potential use in advanced materials and drug design. Despite significant progress in describing this interaction by theoretical and experimental methods, the chemical nature remains somewhat elusive, and it seems to vary with the selected system. In this work we present a detailed DFT analysis of three-center asymmetric halogen bond (XB...