lab equipment to repeat classic QM experiments?
	Hi! I would like to hear from an experimental physicist who could help recommend a list of the minimum equipment needed to repeat some of the "classic" QM experiments, for example the dual-slit experiment with single-photon reception, or an interferometer setup (demonstrating interaction-free measurements).... more » By BW  - 2 Nov - 3 new of 3 messages

	Finitary Path Integrals, Causality & Curved Space-Time
	...In reply to Yablon's question -- the generalization of the Fourier Theorem was, in fact, the very impetus behind the recent work in generalizing the perturbation theory and renormalization formalisms to curved spacetime. It was largely heralded by Brunetti and Fredenhagen and works off of what I believe is called microlocal analysis.... more » By Rock Brentwood  - 31 Oct - 3 new of 3 messages

	Is magnetic flux quantified only in superconductors?
	While considering superconductors, it is generally accepted that there are created fluxons - some natural number of quantas of magnetic flux. I wanted to ask if the situation isn't more general - is magnetic flux quantified also in vacuum? It is suggested by Aharonov-Bohm effect as in superconductors - that... more » By Jarek Duda  - 31 Oct - 3 new of 3 messages

	Looking for Feedback on an Exercise Calculating the QED Path Integral and Greens Fucntions in Curved Spacetime with Boundary Terms
	In the file linked below, I have laid out an exercise upon which I would appreciate your feedback: [link] Basically, I am attempting in the three respective sections of this exercise to: 1) Integrate-by-parts, the classical electrodynamic action, in curved... more » By Jay R. Yablon  - 30 Oct - 6 new of 6 messages

	Is Perfect Reversibility A Myth?
	[ The following text is in the "ISO-8859-1" character set. ] [ Your display is set for the "US-ASCII" character set. ] [ Some characters may be displayed incorrectly. ] Is it possible that prefect reversibility is a mathematical ideal that does not apply exactly to any system found the the real world of... more » By Robert L. Oldershaw  - 30 Oct - 18 new of 18 messages

	machine for cutting quartz
	Hi I planning some experiments for which I need special cut quartz crystals. Does anyone know where one can buy a machine for cutting quartz ? Thanks. Knud By Knud Soerensen  - 28 Oct - 2 new of 2 messages

	Wikipedia "Speed of light" article
	I've nominated the Wikipedia article "Speed of light" ([link]) for peer review, and another Wikipedian suggested to contact other people not currently active on Wikipedia. In case you are interested, feel free to review the article and to leave your comments at... more » By Army1987  - 26 Oct - 2 new of 2 messages

	Path integral question
	In A. Zee's excellent QFT in a nutshell, he starts off by describing the path integral formulation of quantum mechanics. When he gets to the part where it's time to calculate <q_{j+1}| exp(-i H \delta t) |q_j> he uses the free Hamiltonian H=p^2/2m and then sticks in an integral over momentum so the time evolution operator is acting on... more » By metaweta  - 26 Oct - 2 new of 2 messages

	What Happens to Fourier Transforms in Curved Spacetime?
	In flat spacetime, one may take the forward Fourier transform, for example, of a vector J^u, according to: J^u(k) = $ d^4x J^u(x) exp[-i p_s x^s] (1) Does this change at all in curved spacetime? In particular, is it necessary to generalize the Fourier Kernel exp[-i p_s x^s], to something else, for example:... more » By Jay R. Yablon  - 23 Oct - 21 new of 21 messages

	JOB: Sweden : Post-Doc at the Department or Physics and Astronomy
	Uppsala University hereby declares the position of Post-Doc at the Ångström laboratory, Department of Physics and Astronomy, Subdepartment of High-Energy Physics, Accelerator Physics group, to be filled soon for a period of two years. The Post-Doc will work on one of the fundamental limitations for... more » By MFU  - 22 Oct - 1 new of 1 message