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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

ON CABBAGES AND KINGS. “Recently, an emergent continuum elasticity model, capturing the infrared behaviour of amorphous athermal materials has been proposed, based on a tensor electrostatics version of fracton gauge theory. Such a model emerges naturally from the linearized version of the analogue gravity model proposed here.” https://lnkd.in/dusKMKM View in LinkedIn

GRAIN ALIGNMENT. “Within this paradigm, spatial density fluctuations observed in a granular material like sand, are attributed to force chains - force-ordered alignments of grains which inhibit motion of test-grains along the alignment direction (friction).” https://lnkd.in/dusKMKM View in LinkedIn

COSMIC FILAMENTS. “Density perturbation equations around the ‘background’ geometrical configuration do indeed yield as a solution, a time series of density heterogeneities or filamentary structures corresponding to that observed for granular matter, thus showing unexpected similarities with galactic filaments in structure formation models of relativistic cosmology.” https://lnkd.in/dusKMKM View in LinkedIn

BRIDGING TO SAND. “Trapping is characterized by the horizon radius at which the spatial length (given by the metric) may actually diverge. This spatial distance (within a particular frame) is taken to correspond to the correlation length in the phase transition description of ‘spontaneous’ jamming.” https://lnkd.in/dusKMKM View in LinkedIn