LOG#077. Entropic electrogravity.

Tower Wang, in his paper Coulomb Force as an Entropic Force, deduced Coulomb and Newton laws using the Verlinde approach in D=3+1 dimensions. He begins with the Reissner-Nordstrom metric in D=4 spacetime: with the function and He introduces a “geometrized” … Continue reading

LOG#071. Pavšič Units.

Following the thread I began in the previous blog post, today we are going to learn about a non common but very general and universal system of natural units. They were officiallly introduced without name in the literature, until a … Continue reading

LOG#070. Natural Units.

Happy New Year 2013 to everyone and everywhere! Let me apologize, first of all, by my absence… I have been busy, trying to find my path and way in my field, and I am busy yet, but finally I could … Continue reading

LOG#069. CP(n), spheres, 1836.

Data: where we take the radius of the sphere equal to 1 without loss of generality. Thus, is 6!=720 times the volume of the complex projective space . I have not found any other (simpler) way to remember that number … Continue reading

LOG#056. Gravitational alpha(s).

The topic today is to review a beautiful paper and to discuss its relevance for theoretical physics. The paper is: Comment on the cosmological constant and a gravitational alpha by R.J.Adler. You can read it here: http://arxiv.org/abs/1110.3358 One of the … Continue reading

LOG#054. Barrow units.

In a nice paper titled Dimensionality, see here http://rsta.royalsocietypublishing.org/content/310/1512/337.short , the physicist John Barrow studied the rôle of known fundamental constants and their links to the dimensionality of space-time. I will review the main ideas appearing in that paper, and … Continue reading

LOG#053. Derivatives of position.

Position or displacement and its various derivatives define an ordered hierarchy of meaningful concepts. There are special names for the derivatives of position (first derivative is called velocity, second derivative is called acceleration, and some other derivatives with proper name), … Continue reading

LOG#031. Entropic Gravity (II).

We will generalize the entropic gravity approach to include higher dimensions in this post. The keypoint from this theory of entropic gravity, according to Erik Verlinde, is that gravity does not exist as “fundamental” force and it is a derived … Continue reading

LOG#030. Entropic Gravity (I).

In 2010, Erik Verlinde made himself famous once again. Erik Verlinde is a theoretical physicist who has made some contributions to String Theory. In particular, the so-called Verlinde formula. However, this time was not apparently a contribution related to string … Continue reading