Niloufer Anjum
Physics. List of unsolved problems in physics. Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.
The others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail. Unsolved problems by subfield[edit] The following is a list of unsolved problems grouped into broad area of physics.[1] Cosmology, and general relativity[edit] Cosmic inflation Is the theory of cosmic inflation correct, and if so, what are the details of this epoch? Horizon problem Electroweak Horizon Problem Why aren't there obvious large-scale discontinuities in the electroweak vacuum, if distant parts of the observable universe were causally separate when the electroweak epoch ended? Future of the universe Is the universe heading towards a Big Freeze, a Big Rip, a Big Crunch or a Big Bounce? Gravitational wave Can gravitational waves be directly detected?
. OPERA experiment. Michio Kaku. Explorations in Science with Dr. Michio Kaku.
Quantum mechanics of time travel. Until recently, most studies on time travel are based upon classical general relativity.
Coming up with a quantum version of time travel requires us to figure out the time evolution equations for density states in the presence of closed timelike curves (CTC). Novikov[1] had conjectured that once quantum mechanics is taken into account, self-consistent solutions always exist for all time machine configurations, and initial conditions. However, it has been noted such solutions are not unique in general, in violation of determinism, unitarity and linearity. The application of self-consistency to quantum mechanical time machines has taken two main routes. Novikov's rule applied to the density matrix itself gives the Deutsch prescription. Deutsch's prescription[edit] In 1991, David Deutsch[2] came up with a proposal for the time evolution equations, with special note as to how it resolves the grandfather paradox and nondeterminism.
He showed that such fixed points always exist. . And . . . If. Quantum Time Machine Solves Grandfather Paradox. Of all the weird consequences of quantum mechanics, one of the strangest is the notion of postselection: the ability to trigger a computation that automatically disregards certain results.
Here’s an example: suppose you have a long, tortuous expression in which there are a frighteningly large number of variables. The question you want answering is which combination of variables makes the expression logically true. And the conventional way to solve it is by brute force: try every combination of variable until you find one that works. Build Your Own Time Machine. Light speed: Flying into fantasy. 23 September 2011Last updated at 13:25 By Jason Palmer Science and technology reporter, BBC News A photo from Cern's past, or a wormhole?
What if particles really can exceed the speed of light? It is a fascinating and provocative question. But first, it should be said that Thursday's news that physicists have seen subatomic particles called neutrinos exceed the Universe's speed limit is a picture of science still at work. The researchers at Cern in Switzerland and Gran Sasso in Italy have tried really hard to find what they might be doing wrong - over three years and thousands of experiments - because they can hardly believe what they are seeing. The publication of their results is a call for help to pick holes in their methods, and save physics as we now know it. But he has gone further. "So let me put my money where my mouth is: if the Cern experiment proves to be correct and neutrinos have broken the speed of light, I will eat my boxer shorts on live TV. " Don't go buying one just yet.
Stephen King's Rules for Time Travel. Universe & Multiverse. Paradox.