http___metro-portal.hr_moguce-je-da-zivimo-u-svemiru-s-10-i-vise-dimenzija_48562_1.xml
1.1 2.1 3.1 4.1 5.1 6.1 7.1 7.2 8.1 8.2 8.3 9.1 9.2 9.3 10.1 10.2 11.1 11.2 11.3 12.1 12.2 12.3 13.1 13.2 13.3 13.4
Now you’ve heard of black holes, “But what pray tell are black STRINGS?” Simply put? It’s a tunnel made out of black holes stacked one on top of another. Not that these are provable or anything with this type of pseudo science, but I must admit I do like the thought of them. Question though: If something entered the first black hole in this black hole string, would one enter into the resulting alternate dimension say if this first black hole was freestanding and not immediately followed by others, or would one enter into a deeper open doorway to an alternate dimension otherwise NOT accessible by a single black hole entity? Hmmm, theoretically of course, but you know I’m just twisted enough to wonder: Black holes might be infinitely weirder than simply ultra-dense masses from which even light can’t escape – they might actually be the end result of the collapse of five-dimensional objects known as black strings. Yeah…this one’s going to get weird. We only experience four dimensions – three spatial plus time – but certain cutting edge theories suggest there are many more dimensions that we simply can’t perceive. Depending on which theory you buy into, there could be anything from 10 or 11 to 26 total dimensions, with all but the familiar four microscopic and thus hidden from our view. (There are also some theories that suggest there could be a second time dimension, but those are truly bizarre.) There’s no evidence for these hidden dimensions, but they do help hold together certain models of the universe. Physicists can also simulate what would happen if these dimensions did exist, and a team recently decided to tackle a strange cosmic structure known as a black string. A black string is a five-dimensional (including time) version of our more familiar four-dimensional black holes – picture a succession of spherical black holes placed one on top of the other to form a cylindrical shape, and that’s basically what a black string is. The simulation suggests black strings wouldn’t last for very long, as even the slightest disturbance to part of the string would cause it to start collapsing. If the cylinder got squished at its center, this would begin splitting and separating the individual black holes, transforming the continuous string into a bunch of discrete black holes connected by tiny filaments of black string. This process would go on repeating for some time, slicing the string into even still smaller and more numerous divisions, and the supercomputer running the simulation lacked the processing power to take it through to the end. But the researchers suspect the end result would actually be one gigantic black hole. It’s unclear exactly how big these black holes could be, but perhaps the supermassive black holes at the center of galaxies are actually the final remains of black strings? Of course, there’s an even more basic question to consider: in our four-dimensional view of the universe, what exactly would be the difference between a black hole and black string? According to physicists, there really isn’t, at least not in any way we can currently distinguish. All the black holes we see could actually be five-dimensional black strings…or even weirder objects, depending on just how many dimensions there are and how many play a role in the formation of black holes. There’s also the black Saturn, which would be a spherical black hole surrounded by a donut-shaped ring of stacked black hole. This arrangement would greatly resemble Saturn and its rings, hence its name. Or perhaps we should delete the middle black hole and just go with a black ring. There’s no way to know until we can figure out how to detect and interact with these hidden dimensions – assuming they exist – but anyone who thinks the strangeness of black holes can be contained to just four dimensions might want to think again.
1.1 2.1 3.1 3.2 3.3 4.1 4.2 4.3 5.1 5.2 5.3 6.1 6.2 6.3 7.1 7.2 7.3
Moguće je da živimo u svemiru s 10 i više dimenzija Upoznajte bizarnu verziju crne rupe: crnu strunu Ovi hipotetski objekti mogu nastati u slučaju da naš svemir ima skrivene ekstra dimenzije, izvan tri prostorne i vremena, tvrde znanstvenici. Nova studija petdimenzionalnih crnih struna nudi uvid u to kako ti neobični objekti mogu nastati, ako uopće i postoje. I dok je teško vizualizirati petdimenzionalni objekt u našem trodimenzionalnom svemiru, crne strune mogle bi imati cilindričan oblik. "Jedan od problema koji dolazi s proučavanjem viših dimenzija jest što je teško nacrtati takve stvari", objašnjava istraživač Lusi Lehner s Instituta za teorijsku fiziku u Kanadi. Poput crnih rupa, crne strune nastaju kada se materija skupi na toliku gustoću da zakrivljenost prostor-vrijeme postane toliko velika da čak ni svjetlost ne može pobijeći. Lehner i kolege s Instituta koristili su kompjuterske simulacije da analziiraju ponašanje crnih struna. Simulacije su pokazale kako crne strune vjerojatno ne bi opstale dugo. Bilo kakva mala preturbacija ili deformacija oblika narušila bi njenu formu. Za određene modele, male preturbacije ekstra dimenzija vjerojatno bi uzrokovale da se sve crne rupe i strune sjedine u jednu divovsku crnu rupu. I dok ideja više dimenzija može zvučati čudno, fizičke teorije sugeriraju moguće postojanje. Koliko mnogo skrivenih dimenzija postoji ovisi o teoriji, no neke verzije popularne teorije struna sugeriraju kako živimo u 10 ili 11-dimenzionalnom svemiru. "Ako postoje ekstra dimenzije, mogle bi biti vrlo vrlo male, te nevidljive u našem makroskopskom trodimenzionalnom svemiru", navodi Pretorius. No crne rupe nisu jedini crni objekti koji bi mogli egzistirati u više dimenzija. Drugi hipotetski crni objekt je crni Satrun, koji izgleda poput crne rupe okružene prstenom, a tu su i crni prstenovi. "Strune ili prstenovi uvelike ovise o tipu dimenzija koje imamo", zaključuje Pretorius.