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BLACK HOLE MERGERS. “This first gravitational wave event, GW150914, appears to have been caused by the merger to two fairly massive (∼30 M⊙) black holes. Subsequent detections of a BBH mergers (GW151226 and GW170104) and a candidate BBH event (LVT151012) have allowed more robust estimates of the local BBH merger rate density and have confirmed the existence of black holes involved in these mergers with masses that range from 7.5 to 36  M⊙.” (BBH = binary black hole). https://lnkd.in/d8Jh7TB View in LinkedIn

A FIRST. “With the first detection of gravitational waves, the Laser Interferometer Gravitational-Wave Observatory (LIGO) simultaneously confirmed a fundamental prediction of General Relativity and discovered the first known binary black hole (BBH) merger.” https://lnkd.in/d8Jh7TB View in LinkedIn

MILLIONS OF BLACK HOLES. “We predict the black hole count as a function of galaxy stellar mass. We show, for example, that a galaxy like the Milky Way should host millions of ∼30 M⊙ black holes and dwarf satellite galaxies like Draco should host ∼100 such remnants.” https://lnkd.in/d8Jh7TB View in LinkedIn

COUNTING BLACK HOLES. “The cosmic stellar remnant population. We present an empirical approach for interpreting gravitational wave signals of binary black hole mergers under the assumption that the underlying black hole population is sourced by remnants of stellar evolution.” https://lnkd.in/d8Jh7TB View in LinkedIn

DARK MATTER CANDIDATE. “A non-baryonic form of matter, known as dark matter (DM), forms a dominant component of our Universe. Experimental searches have been trying to search for DM particles but no conclusive evidence has shown up yet. Primordial black holes (PBHs) are an alternate well-motivated DM candidate that can constitute all of the DM density.” https://lnkd.in/djrDvvz View in LinkedIn

THE MAGICIAN’S BAG. “We show that the volume and its associated entropy for a collapsed black hole diverges if the final evaporation stage is treated using noncommutative space. This implicates the interior of a black hole possesses adequate space to store information for a black hole of any mass, like the inside of a 'magician's bag'.” https://lnkd.in/d_KWd79 View in LinkedIn

ISSUE OF SCALE. “For such materials, there is an absence of a clear separation of scales between the microphysics and macrophysics.” https://lnkd.in/dusKMKM View in LinkedIn

KEPLER PACKING. “Trapped surfaces form late in the collapse process, only when a certain threshold density is reached, analogous to the critical packing fraction required for jammed states in granular matter. In Fig. 2, untrapped and trapped surfaces are shown, with volume expansion of constant-time (spacelike hypersurface) slices of flat Minkowski spacetime, and volume con- traction occurring for a gravitationally collapsing body.” https://lnkd.in/dusKMKM View in LinkedIn

CONFLICTING STATES. “The laws appear to have firm underpinnings in out-of-equilibrium, nonlinear physical interactions, even though jamming per se appears to be a steady state feature.” https://lnkd.in/dusKMKM View in LinkedIn

ON BLACK HOLES AND JAMMED SAND. ‘In the gravity analogue, these states are proposed to map to untrapped and trapped surfaces which occur in general relativity, most spectacularly in gravitational collapse of a star to a black hole.” https://lnkd.in/dusKMKM View in LinkedIn