linkedin post 2021-04-13 03:40:04

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NUCLEOSYNTHESIS. “We see that for high metallicities (Z ≳ −1.5), a very large stellar progenitor (≳90M⊙) will be required to produce the massive black holes of the type that have been observed in mergers by LIGO. Lower metallicity populations require less extreme progenitors.” (LIGO = an observatory; M⊙ = unit of stellar mass in suns). https://lnkd.in/d8Jh7TB View in LinkedIn
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linkedin post 2021-04-14 03:31:24

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ARTIFICIAL STABLE SILICON DOUBLE BOND. “While carbon–carbon double bonds are common in organic chemistry, at the heart of countless chemical transformations, silicon–silicon double bonds are much rarer. Despite silicon sitting just below carbon in the periodic table, silicon double bonds are much less stable than those involving carbon.” https://lnkd.in/dvvPbnC View in LinkedIn
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linkedin post 2021-04-14 03:30:03

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NON-COMPUTABILITY. “As we will see the argument also goes in the other direction: If the universal quantum computer produces greater than polynomial complexity in exponential time, then certain hard problems (PSPACE-complete) cannot be solved in polynomial time by a quantum computer.” https://lnkd.in/dByfCJV View in LinkedIn
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linkedin post 2021-04-14 03:28:55

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c(N). “Let us suppose that a universal quantum circuit, when run for exponential time failed to produce complexity greater than polynomial in the number of qubits. Consider some problem which is classically hard, i.e., it takes exponential time ∼ c(N) to solve it. It follows that there is a way to get to the answer in a polynomial number of steps running the computer as a quantum computer.” https://lnkd.in/dByfCJV View in LinkedIn
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linkedin post 2021-04-14 03:24:38

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QUITE THE QUESTION. “Several years ago I asked Scott Aaronson a question: Can it be proved that the complexity of a universal quantum circuit, such as those that have been conjectured to describe black holes, grows at the fastest possible rate—linearly with time—until it saturates at the maximum complexity (exponential in the number of qubits)?” https://lnkd.in/dByfCJV View in LinkedIn
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linkedin post 2021-04-16 04:13:16

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BLACK HOLE INSPIRALS. “Many of the astrophysical signatures may be observationally glaring—for instance, even in regions of parameter space where no electroweak corona forms, owing to magnetic fields that are still many orders of magnitude larger than even magnetars, their consequent electromagnetic emissions will be spectacular during binary inspirals.” https://link.aps.org/doi/10.1103/PhysRevD.103.023006 View in LinkedIn
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linkedin post 2021-04-16 04:12:10

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BLACK HOLE BINARIES. “We consider binary inspirals of both magnetic and neutral, and magnetic and magnetic, black hole pairs. The electromagnetic emissions and the gravitational waveform evolution, along with interblack hole separation, display distinct features.” https://link.aps.org/doi/10.1103/PhysRevD.103.023006 View in LinkedIn
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