Recent content by Doctor Luz

Thank you for your explanation selfAdjoint. What does FTL means?

It also concerns parapsycologists, ghosts and all of this stuff... Jocking appart, what is the negative energy in general relativity? is a specific concept of GR or is simply that the solutions are negative numbers? Negative values for energy are common on classical and semiclassical...

Beagle II still missing. http://beagle2.open.ac.uk/index.htm If the crater theory is true we can say "bye bye".

At least you can have a beautifull lantern.

I have heard the two theories, the Air conditioning and the heat. The best results I had were with A/C, however the drivers book of my car sugest to use the front heat at maximum power.

Sometimes when I am driving I make myself the following questions. Why do the front windscreen of cars steam up? What is the physical reason? and what is the best way to eliminate the steam? I have heard many theories about the cause and how to act. who knows the right theory?

Suppose I have some measures of certain physical magnitude "I" between the range x=x1 and x=x2. I have for each x in this range a value y of I, then y=I(x) I have a continuous level of noise y=y1. I have I(x3)=y3 with x1<=x3<=x2. how can I compute the error measuring y3? Thank you

I think the chance of finding an alien civilization is very low. More low if we think in a physical contact. How long can a civilization live? what is the mean life of a civilization? Maybe now there are many civilizations in our galaxy, supposing the very few probability that tomorrow we...

me too

To shield the DC you also can use the so called &mu;-Metal. It costs an eye from the face but is very efficient shielding the magnetic DC. It is an alloy which has a very high permeability constant and the magnetic field lines are easily driven in it.

Repeated adition is not satisfied enven with negative integers.

Aurora Borealis

At T=0 entropy vanishes. What's the entropy of a photon?

I read that in 2002, in one university in Sydney, some scientist made observations in an ancient object in the sky (I don't know what kind of object) and they saw that the fine structure constant could be lower than today various millions of years ago. This would imply that the charge of...

The physics books show as that gravity deppends on distance at 1/r^2. But how we know that that is true at very short distances? Is there any proof? Could gravity deppend on 1/r^n whit n>2 at very short distances? What implications could have?