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COMPLEX GEODESICS. “Geodesics in Complexity Geometry. If the geometry is defined by the usual inner product metric then the curve will be a geodesic for any H. Geodesics generated in this way are not homogeneous along their length.” https://lnkd.in/d3Fw6gf View in LinkedIn

FRAGMENT FROM NATURE for this and next weekend focuses in a remarkable essay authored by two MSc students and their advisors who made observations on the jamming of material like sand in a funnel, and derived conclusions about relativity and black holes from it. Johannes Kepler’s famous 1610 essay in the six sided snowflake similarly extrapolated from a snowflake to material packing. It is in the honored tradition of serious people making observations on things like peacock feathers, beetle casings and butterfly wing scales and deriving conclusions about optics from them. https://lnkd.in/duxTaRF View in LinkedIn

FRACTAL HOLES. “Complexity geometry was introduced by Nielsen and collaborators and applied to black holes. The geometry is fractal-like.” https://lnkd.in/d3Fw6gf View in LinkedIn

Blushing with modesty, this spring tulip is rediculous. A sport of nature. View in LinkedIn

Sophisticated work. View in LinkedIn

SCALAR SUPERSYMMETRY. “Apart from curing the Higgs mass finetuning problem, supersymmetry leads to gauge coupling unification, provides candidates for Dark Matter, and sets the stage for gravity unification via superstrings.” All clear? https://lnkd.in/dfNrUJy View in LinkedIn

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