Submitted by Exponential Times on Sun, 2014-07-27 07:38
July 16, 2014
Time travel is a science fiction staple, inspiring the plots of countless books, movies and Star Trek episodes. But while basic physics allows for the possibility of moving through time, practical concerns like the “Grandfather Paradox,” in which a traveler jumps back in time, kills his grandfather and therefore prevents his own existence, seem to stand in the way. Self-described “quantum mechanic” Seth Lloyd looks at an alternate mode of time travel that eliminates any events that could later prove paradoxical, making this phenomenon both theoretically possible and creatively irresistible, whether you’re an astrophysicist or just a daydreamer.
Submitted by Exponential Times on Fri, 2014-04-25 23:47
Public lecture by Dr Clare Burrage as part of the 2014 Edinburgh International Science Festival.
Billions of years ago the Big Bang sent everything flying apart. In theory, gravity should stop galaxies from moving apart and matter should eventually re-collapse on itself. Surprisingly, we have learnt that galaxies are actually moving apart with ever-increasing speed. Nothing in our current knowledge of physics can explain this, but theorists are developing a solution: dark energy. Roughly 70% of our universe is comprised of dark energy and yet so little is known about it, but satellite and laboratory experiments are under way. Join Dr Clare Burrage as she reveals the nature of dark energy, how it affects other matter in the universe, and what plans we have for observing this mysterious force.
Submitted by Exponential Times on Tue, 2014-04-01 11:41
On March 17, 2014, a group of physicists announced a thrilling discovery: the "smoking gun" data for the idea of an inflationary universe, a clue to the Big Bang. For non-physicists, what does it mean? TED asked Allan Adams to briefly explain the results, in this improvised talk illustrated by Randall Munroe of xkcd.
TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design -- plus science, business, global issues, the arts and much more.
Find closed captions and translated subtitles in many languages at http://www.ted.com/translate
Submitted by Exponential Times on Mon, 2014-03-17 10:50
Evidence that the universe rapidly expanded in its first few nanoseconds has been found by an instrument in Antarctica: Gravitational waves, which have long eluded astronomers, were spotted, supporting this cosmic inflation model. Read more here: http://goo.gl/WsCive
Submitted by Exponential Times on Mon, 2014-03-17 10:37
Assistant Professor Chao-Lin Kuo surprises Professor Andrei Linde with evidence that supports cosmic inflation theory. The discovery, made by Kuo and his colleagues at the BICEP2 experiment, represents the first images of gravitational waves, or ripples in space-time. These waves have been described as the "first tremors of the Big Bang."
Submitted by Exponential Times on Wed, 2014-02-12 02:27
The prediction of gravitational waves, which are the ripples of space and time, is a major theory that many scientists are working hard to confirm. Emmanuel Fonseca talks about how the detection of these waves would uncover previously invisible objects such as black holes and cosmic strings, and may have further important implications.
Emmanuel, a 2nd year PhD student in Physics and Astronomy, gives an informative introduction to gravity, gravitational waves, and what research into this concept could mean for the world. In his talk he also speaks to the importance of communicating scientific research and science education.
Submitted by Exponential Times on Mon, 2014-02-10 13:08
Origins Project is pleased to present a top-notch discussion of the nature of the universe, the possibilities of a multiverse, and exciting discoveries in fundamental physics. Join Nobel Laureates Frank Wilczek, David Gross, and Brian Schmidt, as well as esteemed scientists Wendy Freedman, Maria Spiropulu, and Lawrence Krauss for an out-of-this-world conversation.
We live in one universe. Is it unique? Is it required? How can we find out? These issues touch on the forefront of particles physics and cosmology, from the Large Hadron Collider to the edges of the visible Universe. This panel will bring together the leading scientists and thinkers working at both these frontiers to discuss how we can probe the fundamental fabric of reality.
Some notes from discussion with Prof Moriarty
1. At 5:45, that Silicon cantilevers can be used to see atoms as long as the oscillation amplitude is high. See Sugimoto et al. Nature 446 64 (2007)
2. Terrible guitar playing chose by Brady against Phil's wishes - see our gold ratio song at http://youtu.be/nBgQPSUTWVM featuring Phil's work!
Submitted by Exponential Times on Tue, 2013-12-24 13:48
Inflation, an enduring theory about our universe and how it was formed, proposes that just after the Big Bang, the universe underwent a period of rapid expansion. The theory has historically done a good job explaining a wide range of phenomena we see in the cosmos today. The originator of the idea of cosmic inflation, Alan Guth, explains the theory.