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/cbfa1f1f-a38b-41dc-9e04-e9608bdc51d5n%40googlegroups.com.
