Dande Lion Farmva

I conduct maintain a headache and blame Nature mag for it. For almost fifteen years, I conduct maintain worked on quantum gravity phenomenology, which agency I written report ways to experimentally bear witness the quantum properties of infinite together with time. Since 2007, my query surface area has its ain conference series, “Experimental Search for Quantum Gravity,” which took house most late September 2016 inwards Frankfurt, Germany. Extrapolating from whom I personally know, I gauge that almost 150-200 people currently operate inwards this field. But I conduct maintain never seen nor heard anything of Chiara Marletto together with Vlatko Vedral, who only wrote a comment for Nature  magazine complaining that the query surface area doesn’t exist. In their comment, titled “ Witness gravity’s quantum side inwards the lab ,” Marletto together with Vedral telephone telephone for “a focused coming together bringing together the quantum- together with gravity-physics commu...

Fluorescence picture of Bose-Einstein-Condensate. Image Credits: Stefan Kuhr together with Immanuel Bloch, MPQ String theory is infamously detached from experiment. But inwards a novel paper, a grouping from United Mexican US seat forrad a proposal to alter that String theory phenomenology together with quantum many–body systems Sergio Gutiérrez, Abel Camacho, Héctor Hernández arXiv: 1707.07757 [gr-qc] Ahead, allow me endure clear they don’t desire to show string theory, but the presence of additional dimensions of space, which is a prediction of string theory. In the paper, the authors calculate how additional space-like dimensions demeanour on a condensate of ultra-cold atoms, known every bit Bose-Einstein-Condensate. At such depression temperatures, the atoms transition to a acre where their quantum wave-function acts every bit ane together with the organization begins to display quantum effects, such every bit interference, throughout. In the presence of extra-dimens...

Galaxy slime. [ Img Src ] Physicists receive got gathered prove that space-time tin comport similar a fluid. Mathematical evidence, that is, but even so evidence. If this relation isn’t a coincidence, so space-time – similar a fluid – may receive got substructure. We shouldn’t beak of infinite in addition to fourth dimension equally if the 2 were distant cousins. We receive got known at to the lowest degree since Einstein that infinite in addition to fourth dimension are inseparable, 2 hemispheres of the same cosmic brain, joined to a unmarried entity: space-time. Einstein also taught us that space-time isn’t flat, similar a paper, but bent in addition to wiggly, similar a prophylactic sheet. Space-time curves unopen to volume in addition to energy, in addition to this gives rising to the upshot nosotros telephone band gravity. That’s what Einstein said. But turns out if y'all write downwards the equations for modest wiggles inwards a medium – such equally soundwaves inward...

Srsly? Several people asked me to comment on a newspaper that is hyped past times phys.org every bit a examination of quantum gravity . I’ll brand this brief. First things first, why are you lot nonetheless next phys.org? Second, the newspaper inward inquiry is on the arXiv too is titled “ a real like newspaper was inward 2012 . It is right that noncommutative geometry plays a purpose inward many approaches to quantum gravity too it’s non an alone uninteresting idea. However, the variant that the authors desire to examination inward the newspaper is non of the usually discussed type. They desire the final result to move relevant for the center-of-mass coordinates, too then that it scales alongside the full mass. That supposition has no back upward from whatever approach to quantum gravity. It’s made-up. It is besides mathematically highly problematic. Third, I already spelled out in my review several years ago  that this is bogus (see department 4.6) too doesn’t follow...

For my 40th birthday I got a particular gift: 2.5 σ prove for quantum gravity. It came courtesy of Niayesh Afshordi, Professor of astrophysics at Perimeter Institute, too inward contrast to what yous mightiness remember he didn’t teach the 2.5 σ on Ebay. No, he got it from a LIGO-data analysis, results of which he presented at the 2016 conference on “Experimental Search for Quantum Gravity.” Frankly I expected the 2.5 σ gift to speedily bring together the listing of forgotten anomalies. But so far it has persisted, too it seems most fourth dimension I let on this for you. Evidence for quantum gravity is difficult to come upwards past times because quantum fluctuations of space-time are so damn tiny yous can’t mensurate them. To overcome this impasse, Afshordi too his collaborators looked at a illustration where the effects of quantum gravity tin locomote large: Gravitational waves produced past times dark hole mergers. Their catch is that General Relativity may non correct...

Strings. [image: freeimages.com ] “Greetings doctor Hossenfelder! I am a Princeton physics major who regularly reads your wonderful blog. I lately came across a curious passage inwards Brian Greene’s introduction to a reprint edition of Einstein's Meaning of Relativity which claims that: “Superstring theory successfully merges full general relativity in addition to quantum mechanics [...] Moreover, non exclusively does superstring theory merge full general relativity with quantum mechanics, but it also has the capacity to comprehend — on an equal reason — the electromagnetic force, the weak force, in addition to the strong force. Within superstring theory, each of these forces is merely associated with a dissimilar vibrational designing of a string. And so, similar a guitar chord composed of 4 dissimilar notes, the 4 forces of nature are united inside the music of superstring theory. What’s more, the same goes for all of thing every bit well. The electron, the quarks,...

Fluid fine art past times Vera de Gernier. Stephen Hawking sadly passed away before this year , but his scientific legacy is good alive. The dark hole information loss occupation inward detail soundless keeps physicists upwardly at night. H5N1 novel experiment mightiness choose us a pace closer to solving it. Hawking notably was start to derive that dark holes are non exclusively black, but must emit what is similar a shot called “Hawking radiation”. The temperature of this radiations is inversely proportional to the volume of the dark hole, a relation that has non been experimentally confirmed, so far. Since the known dark holes out at that spot inward the universe are rattling massive, their temperature is every bit good pocket-size to live on measurable. For this reason, physicists receive got begun to examination Hawking’s predictions past times simulating dark holes inward the laboratory using superfluids, that are fluids at a few degrees higher upwardly absolute nothing w...