TheoreticalPhysics
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Stephen Hawking’s last paper has been published on multiverse theory
The last paper Stephen Hawking wrote before he died has now been published in the Journal of High Energy Physics. Though some version of the paper has been available on the preprint site arXiv since last year, it was submitted to the journal for review just days before Hawking passed, and it deals with some theoretical physics about the many universes that might have been created by the Big Bang.
Researchers create space-time crystal schematic, still won't undo those ill-advised high school photos
Think your cute little Minecraft schematics are the bomb? Well, a group of international researchers sees your quaint, little 3D masterpiece and raises you the blueprint for a 4D space-time crystal. Building on an idea floated earlier this year by theoretical physics guru and Nobel Laureate Frank Wilczek of MIT, a team led by UC Berkeley researcher Tongcang Li has created a schematic for a crystal with a fourth dimension -- movement in time. The resulting space-time crystal is being described as something akin to an infinitely running clock that does not require any additional energy once it starts going. The researchers also claim that the crystal can be built in just a few years -- provided that the necessary funding is available to the team that decides to take on the project, of course. Unfortunately, the crystal is still a long way from the Mr. Fusion-powered, time-traveling DeLorean that we truly desire. In the meantime, brainy types can feel free to click on the source link for more nuggets of wisdom about the research.
Vanishing neutrons could be travelling to a parallel universe
Time to break out your theoretical physics cap for a moment. A new idea about the cause of neutron loss (a phenomena in which neutrons seem to momentarily disappear), is pushing the boundaries of easy to conceptualize science. Zurab Berezhiani and Fabrizio Nesti of Italy's University of l'Aquila have suggested that the particles could briefly be visiting parallel universes before returning. Experiments have shown that the rate of loss is dependent on the direction and strength of an applied magnetic field -- an anomaly that doesn't jibe with current physics. If a parallel universe existed consisting of so-called "mirror particles," however, the neutrons could temporarily swap places with its invisible twin before returning to its rightful place in this world. More experimentation is needed, but if the predictions of Berezhiani and Nesti are correct, it could indicate that we're surrounded by mirror particles in a parallel universe -- a potential culprit for the mystery of dark matter.
What would happen if you put your hand in the Large Hadron Collider? Er, well, um... (video)
Scientists, they've made our lives infinitely easier, healthier, and longer, but sometimes even their giant intellects can be stumped. Here we have a perfect example of such a scenario, where the seemingly innocuous question of what might happen if one were to dip a hand inside the Large Hadron Collider has generated a wide range of hypotheses, none of which sound particularly assured of being correct. The trouble is that, aside from the known unknowns -- such as whether the accelerated protons would crash and explode upon contact with your hand or just pass through -- there are surely unknown unknowns that will likely become apparent only once you try to do the act itself. So, any volunteers?
Stephen Hawking in space (space... space...)
Well-known theoretical physicist and all-around geek hero Stephen Hawking has told the press he plans to undertake a zero-gravity flight this year in preparation for a hopeful berth on Richard Branson's Virgin Galactic space tourist service when it launches in 2009. Hawking, who has the neurological disease amyotrophic lateral sclerosis, communicates via a blink-controlled computer and uses a high-tech wheelchair for mobility, making space flight somewhat challenging -- but Virgin Galactic spokesperson Stephen Attenborough said in a statement Monday that Branson is committed to working through the issues that need to be addressed in order to accomodate people with disabilities on his company's trips into suborbit. Cost of a two-hour suborbital spaceflight? $200,000. The look on the most famous cosmologist's face upon actually making it into space? Priceless.
