Recent content by Arawn

What I've heard, the problem with the gravitons is that they only appear from the linear approximation of the general relativity, and cannot be reproduced from the exact solutions. In other words the concept of a graviton is just an approximation. That's why it seems to me that the gravitation...

Yes, that's a good point... The mechanism how the gravitational force acts is just so different. With other forces, you have objects A and B changing particles... there's straight interaction between A and B. With gravitation, however, you have A and B sitting in the spacetime, and the curving...

To be more exact, does gravitation have a force similar to the other basic forces: electromagnetic, strong and weak force? These other three are explained by the exchange of certain particles, but gravitation is explained by curving the spacetime. It doesn't look quite same to me... :confused:

Hmm, don't forces of nature more like increase entropy, since they are destructive forces? Wind, rain and UV rays don't make buildings or maintain bodies; they erode them. They are tools of entropy a living being must fight against. From this point of view the natural forces seem like the...

Life is Universe's way to increase entropy faster. Living beings actively try to decrease entropy (increase order) locally, at least by sustaining their own bodies. More complex organisms, for example we humans, also attempt to decrease entropy at our surroundings (buildings, cleaning). But all...

Thanks for the replies! Things you told sound sensible, and I think I'm having a bit better understanding now.

I can understand what the electric field vector E and the magnetic flux density vector B mean, but what exactly are the meanings of the two other vectors, the electric displacement vector D and the magnetic intensity vector H? What are their physical explanations?