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DUAL STATES. “Thus, in each such alignment direction, these materials behave like a solid, while, in other directions, the material may indeed ‘flow’, akin to a fluid.” (Very quantum description in macroscopic material!) https://lnkd.in/dusKMKM 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

THE BLACK HOLE. “In particular, an isotropically jammed state in granular matter corresponds in the analogue gravity description to the formation of a trapped surface in gravitational collapse, with the envelope of such trapped surfaces being a horizon.” https://lnkd.in/dusKMKM View in LinkedIn

THE HOPE. “As more mergers are detected, the prospect of identifying the host galaxy population, either directly through the detection of electromagnetic counterparts of binary neutron star mergers or indirectly through the anisotropy of the events, will become a realistic possibility.” https://lnkd.in/d8Jh7TB View in LinkedIn

IMMINENT MERGER RATE. “If roughly 1 per cent of black holes are involved in a binary black hole merger, then the reported merger rate densities from advanced Laser Interferometer Gravitational-Wave Observatory can be accommodated for a range of merger time-scales, and the detection of mergers with >50 M⊙ black holes should be expected within the next decade.” (M⊙ = solar mass ~equivalent to mass of the sun). https://lnkd.in/d8Jh7TB View in LinkedIn

DISTRIBUTION. “Most low-mass black holes (∼10 M⊙) typically reside within massive galaxies (M⋆ ≃ 10(11)  M⊙) while massive black holes (∼50 M⊙) typically reside within dwarf galaxies (M⋆ ≃ 10(9)  M⊙) today.” (M⊙ = solar mass ~equivalent to mass of the sun). https://lnkd.in/d8Jh7TB View in LinkedIn

This image includes the most distant galaxies and protogalaxies we ever have seen. The largest galaxies in the image are as close as 6 billion light years, while the smallest dots are protogalaxies as far away as 30 billion light years. This image thus spans the edge of our affectable universe, with most of the places it shows being forever beyond our reach. https://lnkd.in/dHhggEG View in LinkedIn