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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

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THE END OF PHYSICS. (1894) Albert Michelson + Edward Morley, whose famous experiment refuted the existence of the luminiferous ether, said “that the great principles had already been discovered, and that physics would henceforth be limited to finding truths in the sixth decimal place.” (Just before Einstein unveiled relativity!). https://lnkd.in/dq9jWpt View in LinkedIn

EXHAUSTING KNOWN GEOMETRY. “The classical growth of the black hole interior shown in figure 2 cannot go on forever: the black hole eventually runs out of linearly independent classical geometries, and a transition must occur from the complexity ramp to a complexity plateau.” https://lnkd.in/d3Fw6gf View in LinkedIn

STUCK IN WONDERLAND. “Classical GR governs the interior of an eternal AdS black hole for a tiny fraction of the time. The rare “classical” episodes last for a time ∼ eS and in between them the black hole exists in a vast doubly exponential sea of time, stuck in a state of complexity equilibrium. Very little is known about the geometry of the interior, if indeed it has a geometry, during these periods of equilibrium.” (GR = general relativity). https://lnkd.in/d3Fw6gf View in LinkedIn

THE PHYSICIST’S ANSWER. “The interesting fact is not that there are three different answers to three different questions for t > texp. What is remarkable is that for t < texp all three give the same answer; namely, there is a unique classical wormhole geometry whose length, volume, and action grow linearly with time in agreement with the classical Einstein equations. At exponential time the agreement breaks down and the three questions have different answers.” https://lnkd.in/d3Fw6gf View in LinkedIn