On Sunday, December 23, 2018 at 2:33:54 AM UTC, Brent wrote: > > > > On 12/22/2018 12:04 PM, Philip Thrift wrote: > > > > https://www.eurekalert.org/pub_releases/2018-12/lsu-be122018.php > > Theoretical physicists developed a theory called loop quantum gravity in > the 1990s that marries the laws of microscopic physics, or quantum > mechanics, with gravity, which explains the dynamics of space and time. > Ashtekar, Olmedos and Singh's new equations describe black holes in loop > quantum gravity and showed that black hole singularity does not exist. > > > "In Einstein's theory, space-time is a fabric that can be divided as small > as we want. This is essentially the cause of the singularity where the > gravitational field becomes infinite. In loop quantum gravity, the fabric > of space-time has a *tile-like structure*, which cannot be divided beyond > the smallest tile. My colleagues and I have shown that this is the case > inside black holes and therefore there is no singularity," Singh said. > > "These tile-like units of geometry--called 'quantum excitations'-- which > resolve the singularity problem are orders of magnitude smaller than we can > detect with today's technology, but we have precise mathematical equations > that predict their behavior," said Ashtekar, who is one of the founding > fathers of loop quantum gravity. > > > But is this consistent with https://arxiv.org/abs/1109.5191v2 which > showed spacetime to be smooth down to 1/525 of the Planck length? > > Brent >
*If we can't measure a Planck length, how can we measure of fraction of that value? How large are those tiles in relation to Planck length? AG* > > > "At LSU, we have been developing state-of-the-art computational techniques > to extract physical consequences of these physical equations using > supercomputers, bringing us closer to reliably test quantum gravity," Singh > said. > > Einstein's theory fails not only at the center of the black holes but also > to explain how the universe was created from the Big Bang singularity. > Therefore, a decade ago, Ashtekar, Singh and collaborators began to extend > physics beyond the Big Bang and make new predictions using loop quantum > gravity. Using the mathematical equations and computational techniques of > loop quantum gravity, they showed that the Big Bang is replaced by the "Big > Bounce." > > > > [ a short lecture on LQG: https://www.youtube.com/watch?v=QMpkFde3euA ] > > - pt > -- > 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 everything-li...@googlegroups.com <javascript:>. > To post to this group, send email to everyth...@googlegroups.com > <javascript:>. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > > > -- 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
