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 [email protected] <javascript:>. > To post to this group, send email to [email protected] > <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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
