The properties of the first generation of black-hole seeds trace and distinguish different models of formation of cosmic structures in the high-redshift universe. The observational challenge lies in identifying black holes in the mass range ∼ 100 − 1000M⊙ at redshift z ∼ 10. Here we show that future groundbased laser interferometers could observe gravitational waves produced by the coalescence ...

Recent works have included the effect of rotation on simulations of black hole events at the LHC, showing that the angular momentum of the black hole cannot be ignored and it makes a non-trivial contribution for most of the lifetime of the black hole. A key consequence of the rotation of the black hole is that the Hawking radiation is no longer isotropic, making it more difficult to infer space...

This paper updates the influence of environmental and source factors of shocks driven by coronal mass ejections (CMEs) that are likely to influence the solar energetic particle (SEP) events. The intensity variation due to CME interaction reported in [1] is confirmed by expanding the investigation to all the large SEP events of solar cycle 23. The large SEP events are separated into two groups, ...

A bulk acoustic wave cavity as high frequency gravitational antenna has recently detected two rare events at $5.5$MHz. Assuming that the are due to waves, their characteristic strain amplitude lies about $h_c\approx 2.5 \times 10^{-16}$. While a cosmological signal is out of picture large energy carried by could be merging planet mass primordial black holes ($\approx 4\times 10^{-4} M_\odot$) i...

ABSTRACT Tidal disruptions of stars by stellar-mass black holes are expected to occur frequently in dense star clusters. Building upon previous studies that performed hydrodynamic simulations these encounters, we explore the formation and long-term evolution thick, super-Eddington accretion disks formed. We build a disk model includes fallback material from tidal disruption, onto hole, mass los...

We present a new Fortran Monte Carlo generator to simulate black hole events at CERN’s Large Hadron Collider. The generator interfaces to the PYTHIA Monte Carlo fragmentation code. The physics of the BH generator includes, but not limited to, inelasticity effects, exact field emissivities, corrections to semiclassical black hole evaporation and gravitational energy loss at formation. These feat...

We suggest that most nearby active galactic nuclei are fed by a series of small– scale, randomly–oriented accretion events. Outside a certain radius these events promote rapid star formation, while within it they fuel the supermassive black hole. We show that the events have a characteristic time evolution. This picture agrees with several observational facts. The expected luminosity function i...

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

Accretion disk reflection spectra, including broad iron emission lines, bear the imprints of the strong Doppler shifts and gravitational red-shifts close to black holes. The extremity of these shifts depends on the proximity of the innermost stable circular orbit to the black hole, and that orbit is determined by the black hole spin parameter. Modeling relativistic spectral features, then, give...