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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

JAMMING. “Granular matter, and indeed many other athermal amorphous materials, exhibit an intriguing property known as jamming. The standard characterization of this phenomenon is in terms of strong stress heterogeneities occurring in the material, with and without an externally applied stress.” https://lnkd.in/dusKMKM View in LinkedIn

THE PHILOSOPHER’S KNOT. “The three possibilities are all correct but they answer different questions.” https://lnkd.in/d3Fw6gf View in LinkedIn

IT IS ASSUMED by most of us that the macro is a fractal reflection of sorts of the micro. But this ignores the phenomenon of emergence that occurs when simple elements aggregate to form complexity with unexpected properties that are not the sum of its parts. That said, this essay on coarse material jamming is a diamond in the rough, and the two professors were lucky to have such talented students. https://lnkd.in/dusKMKM View in LinkedIn

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