Recent content by salsero

I can contribute this: http://www.science.uva.nl/research/itf/ (Amsterdam)

If you work in units where c = 1 and h-bar = 1, all physical quantities can be described as having a dimension (unit) which is some power of the mass. Examples: Mass, energy, and momentum have a dimension of mass (i.e. mass dimension = 1). Length and time have a dimension of 1/mass (i.e...

Hi tomato, Let me try. I have three answers: 1) What makes you think that x and y should anticommute? - There is NO principle that says that for fermions all comutators are blindly replaced by anticommutators. 2) We have the same in Dirac fermions: x and y (which are usually denoted by u...

So I understand that there is no simple example. One cannot understand how quantum mechanics helps to the computation without considering details of some complicated algorithms...

Could anybody list (and write a few explanatory words about) the various theories which explain the origin of the dark matter and the dark energy? Thanks!

What is "gravity lift"?

Could you please give me a simple example of a mechanism in which the quantum nature of qubits is used to do any calculation in a non-classical way? (Please write it here.) Thanks!

I still haven't seen a single (simple) example of how a quantum computer uses quantum mechanics to do anything useful. And it's not that I didn't ask. :cry:

Maybe you are referring to the difficulty in explaining superconductivity in high-temperature superconductors by the BCS theory. However, this does not mean that BCS does not explain superconductivity in simple materials.

Interesting! How did you actually find this? Any comments from the high-energy people?

Interesting, clear, starts from the basics: The Principles of Quantum Mechanics / Dirac. (Some people consider this book old-fashioned or difficult, but I don't think so.)

That's not a complete answer: the wavelength depends also on the medium through which the light passes. The color we see is determined by the frequency.

A professor who read my recently completed M. Sc. thesis commented that the thesis was good enough so that it was worth eliminating English mistakes from there. However, I can't do it better than I did, since I am not a native English speaker. So I am looking for someone who would be interested...

Don't read that book!

Hi Neotrekkie! Paul Steinhardt from Princeton discusses this possibility in his papers about the cyclic model of the Universe. The papers are easy to understand, and you can find them on his website: http://feynman.princeton.edu/~steinh/