tag:blogger.com,1999:blog-7315236707728759521.post8529162997182321058..comments2022-01-18T14:47:56.421-07:00Comments on Dispatches From Turtle Island: Lone Direct Dark Matter Detection Signal ContradictedAndrew Oh-Willekehttp://www.blogger.com/profile/02537151821869153861noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-7315236707728759521.post-40256371872486879552018-12-11T00:18:43.426-07:002018-12-11T00:18:43.426-07:00In the literature, the end state of black hole evo...In the literature, the end state of black hole evolution is sometimes called a "remnant". <br /><br />Actually every theory that has evaporating black holes has some kind of final objects. It's just that in some theories, the "final objects" are simply a bunch of ordinary particles, whereas in other theories, the final objects are more exotic, like non-evaporating micro black holes. <br /><br />There may even be theories which are somehow intermediate between these two cases. Already in string theory, black holes can be a lot like charged, very heavy solitons. What's the difference between a micro black hole that doesn't evaporate, and a very heavy elementary particle? Especially if the "particle" is something like a GUT monopole, a topologically stable soliton in the elementary fields. <br /><br />So it's quite conceivable (at least to me) that there are black hole final states which consist e.g. of a big family of massive, stable, gauge-theoretic topological solitons. I believe the real problem in describing the end of black hole evaporation, has to do with space-time structure. Classically, a singularity forms but it is hidden behind the event horizon. Semiclassically, the event horizon shrinks to nothing, exposing the singularity. Is the singularity the remnant, a permanent space-time defect? Or is a quantum black hole singularity-free? Even string theorists haven't answered these questions to their own satisfaction. Mitchellhttps://www.blogger.com/profile/10768655514143252049noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-34475952035296236112018-12-09T16:11:42.389-07:002018-12-09T16:11:42.389-07:00https://en.wikipedia.org/wiki/Micro_black_hole
Bl...https://en.wikipedia.org/wiki/Micro_black_hole<br /><br />Black holes in quantum theories of gravity<br />It is possible, in some theories of quantum gravity, to calculate the quantum corrections to ordinary, classical black holes. Contrarily to conventional black holes, which are solutions of gravitational field equations of the general theory of relativity, quantum gravity black holes incorporate quantum gravity effects in the vicinity of the origin, where classically a curvature singularity occurs. According to the theory employed to model quantum gravity effects, there are different kinds of quantum gravity black holes, namely loop quantum black holes, non-commutative black holes, asymptotically safe black holes. In these approaches, black holes are singularity-freeneohttps://www.blogger.com/profile/16769182614452171312noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-29894112564426284232018-12-09T10:27:06.653-07:002018-12-09T10:27:06.653-07:00Do you have any references for this?
Just wonderi...Do you have any references for this?<br /><br />Just wondering how this would work- Would black holes not evaporate? Would they only evaporate to some limiting mass/volume/temperature? Or something else?websterlinghttps://www.blogger.com/profile/15336870222771684025noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-14495135256963032302018-12-08T10:44:49.262-07:002018-12-08T10:44:49.262-07:00assuming that it can continue to decay, which some...assuming that it can continue to decay, which some QG says is not the case.neohttps://www.blogger.com/profile/16769182614452171312noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-13064280455942168852018-12-08T10:03:42.744-07:002018-12-08T10:03:42.744-07:0010^19 eV = 16000 grams. A black hole with this mas...10^19 eV = 16000 grams. A black hole with this mass has a lifetime of 3.4e-13 seconds. So, not a good DM candidate.websterlinghttps://www.blogger.com/profile/15336870222771684025noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-66684063826555195582018-12-07T18:31:32.098-07:002018-12-07T18:31:32.098-07:00whats your fav candidate for dark matter particle?...whats your fav candidate for dark matter particle? <br /><br />personally i think the most parsimonious explanation is micro black holes (on order of 10^19ev) + MOND<br /><br />no need to extend the SM, except masses for neutrinos (dirac or majorna)neohttps://www.blogger.com/profile/16769182614452171312noreply@blogger.com