Recent content by csyrony

I discovered yesterday that the Dirac delta function was actually invented by Fourier 106 years before Dirac rediscovered it. It appears in his 1822 book "The analytical theory of heat" on page 434 of the 1878 English translation. I wouldn't have spotted it but it was picked up by Hawkins in his...

> If I understand correctly, you claim to know of a string theory having fermions (and in fact the standard model) without supersymmetry. I would be delighted to learn that it is true such a string model exists. No, I'm wrong, sorry, it doesn't exist. There are several string theories that...

My understanding is that the objects are not immersed in water. The internal pressure will be as stated above. The external pressure can't be easily determined as it depends on the conditions of the ground in which it is set. Normally a trench would be dug, the fitting inserted and it would be...

> What are the differences between String Theory and Super String Theory? Is it just a difference in dimensions in layman's speak? I'm not an expert in this, but my understanding is that superstring theories contains supersymmetry, i.e. it contains supersymmetric particles and full symmetry...

Start by assuming that the bullet does go completely through the block, you can check that later. Further, start by assuming that the bullet exits the block long before the block has moved 5.00 cm. Now, work backwards from where the block is stopped by the spring. The force is a linear function...

** the book by Zwiebach where it is explained in details I can confirm that a detailed description of the light cone gauge is in Barton Zwiebach's book "A first course in string theory". It is part of general relativity and not part of an extension beyond the standard model. It gets used...