For some reason my images don't show up right the first time I send. [image: Penrose diagram for Schwarzschild truncated.jpg]
On Saturday, July 18, 2020 at 7:04:37 AM UTC-5 Lawrence Crowell wrote: > On Friday, July 17, 2020 at 7:15:27 PM UTC-5 Brent wrote: > >> But real black holes form by collapse of star and so don't have the time >> symmetry of a Schwarzschild bh. >> >> Brent >> > > The idealized gadget seen in the Penrose conformal diagram probably refers > to a quantum of black hole or white hole. Often people refer to the > truncated diagram such as the one below. In effect the entanglement is > removed or ignored, and the entropy associated with that is defined by the > entropy of a single black hole. The elementary diagram, such as the one I > included yesterday, is an idealization. A real black hole has a massive > entanglement with other states. I think the are with Hawking radiation and > BMS symmetries that escape to ℐ^+, instead of with another black hole in a > huge number of bipartite entanglements. > > Susskind has this idea of ER = EPR, where Hawking radiation is entangled > with black holes in a sort of wormhole manner. I think this is really with > BMS charges and not so much with wormholes. The wormhole aspects from this > stem from the local negative energy vacua near a black hole, say the > Boulware vacuum, and the symmetries of this are taken off to ℐ^+ as > ancillary symmetries of spacetime not found in i^0. So large astrophysical > black holes are in a sense messy and we do not observe these entanglements > and instead see a large number of separable states with thermal entropy. > > LC > > > [image: Penrose diagram for Schwarzschild truncated.jpg] > > >> >> On 7/17/2020 3:02 PM, Lawrence Crowell wrote: >> >> The elementary Penrose diagram for the Schwarzschild black hole >> >> [image: penrose diagram for Schwarzschild BH.jpg] >> has a while hole for the bottom triangle, a black hole as the upper >> triangle and the two squares are regions with entangled states. The while >> hole produces quanta and the black hole absorbs quanta. This is a vacuum >> theory with the content of raising and lowering operators a and a^† for >> entangled states. >> >> LC >> On Thursday, July 16, 2020 at 3:53:19 AM UTC-5 [email protected] wrote: >> >>> >>> Quantum Circuit Training for Machine Learning Tasks and Simulating >>> Wormholes >>> >>> http://iontrap.umd.edu/2019/12/15/quantum-circuit-training-on-a-hybrid-quantum-computers/ >>> >>> >>> cf. >>> >>> >>> https://www.quantamagazine.org/john-preskill-quantum-computing-may-help-us-study-quantum-gravity-20200715/ >>> >>> @philipthrift >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/everything-list/6ee6932f-d8aa-4006-a4f3-81d99efb256cn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/everything-list/6ee6932f-d8aa-4006-a4f3-81d99efb256cn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> >> -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/1366eb61-c074-4114-97b5-c1d5d29d5376n%40googlegroups.com.
