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BLACK HOLE LABS. “We discuss a cornucopia of potential astrophysical signatures and constraints on magnetically charged black holes of various masses. As recently highlighted, being potentially viable astrophysical candidates with immense electromagnetic fields, they may be ideal windows to fundamental physics, electroweak symmetry restoration, and nonperturbative quantum field theoretic phenomena.” https://lnkd.in/dif-jK3 View in LinkedIn

STUNNING. “This connection between black holes and complexity classes is unexpected, and in my opinion very remarkable. Broadly speaking it says that the longer classical general relativity describes the interior of black holes, the less quantum computers have power to solve PSPACE-complete problems.” Remarkable paper. https://lnkd.in/dByfCJV View in LinkedIn

COLLAPSE OF RELATIVITY. “The problem was motivated by a question about the limits of classical general relativity: For how long a time does classical GR hold during the evolution of a black hole?” (GR = general relativity). https://lnkd.in/dByfCJV View in LinkedIn

BEYOND TS ELIOT. “Conjecture: The complexity of certain quantum circuits grows linearly with the number of time-steps, until it reaches its maximum value, exponential in the number of qubits.” https://lnkd.in/dByfCJV View in LinkedIn

MAKING THE DATA FIT THE MODEL. “The analogue of Hubble friction in that case may help stabilize and stimulate growth of structures in the density profile. This is certainly a direction worthy of exploration.” https://lnkd.in/dusKMKM View in LinkedIn

IMAGINATIVE CONNECTION. “Isotropic jamming would correspond clearly to a situation with spherical symmetry. In this case, with Tμν = 0, the vacuum Einstein equation reduces to Rμν = 0 which admits the Schwarzschild solution.” https://lnkd.in/dusKMKM View in LinkedIn

FUDGE FACTOR. “If so, a partial remedy of this situation may emerge from introducing a cosmological constant into the analogy. An alternate mapping of the jamming state, especially shear jamming, may also emerge from considering expanding analogue spacetimes, rather than contracting ones as done here.” (Einstein’s “greatest mistake” was the cosmological constant). https://lnkd.in/dusKMKM View in LinkedIn

REPULSIVE FORCE. “Further, the attractive nature of gravity implies that a gravity analogue of granular matter may be deemed inadequate for describing microscopic granular repulsions.” https://lnkd.in/dusKMKM View in LinkedIn

THE ISSUE OF FRAGILITY. “The incipient, preliminary and necessarily incomplete general relativistic analogy presented here falls short of describing an important feature of granular matter, namely fragility.” https://lnkd.in/dusKMKM View in LinkedIn

FLUIDS VS SOLIDS. “Analogue gravity in barotropic, in viscid fluids with acoustic perturbations is now well-understood both theoretically and observationally. In that case, the knowledge of the basic fluid mechanics equations (Euler-Navier-Stokes) for centuries provides a relative advantage over the case of granular matter where fundamental theoretical understanding is still being sought.” https://lnkd.in/dusKMKM View in LinkedIn