Field theory Definition and 523 Threads

If length contraction was quantized, then a particle of a given radius could have a constant radius for many observers moving at different speeds. Could such a particle be used to formulate a quantum field theory?

I noticed that some copies of this book are available at Amazon for as low as $13.00, and increbible price. I just ordered a copy for my self. If anyone else is interested, they are here:

Every physical theory is a synthesis of certain ideas ( advanced on the basis of observation and/or experiment ) and a reliable mathematical apparatus . The building up of a theory is a complicated and controversial process , developing according to successive observations and hypotheses. There...

The propagation of something, photon or particle, can have many possible paths, thus the Feynman path integral formulation of quantum mechanics. The initial position is relatively fixed and the final position is relatively fixed (compared to all of space). But it's path from beginning to end can...

Does anyony know of a good, cheap (Perhaps Free :biggrin: ) book that will teach me the basics of quantum field theory. I am a very new beginner, so I will need something simple please. thanks.

I am not very well versed in quantum mechanics, however I was reading a theory stating that the strong and weak nuclear forces are the same. Any opinions? By combining and analyzing the principles of Electrostatics, Isaac Newton’s Law of Gravity, Quantum Mechanics, and Einstein’s...

[SOLVED] String Field Theory? Stupid Question of the Day: What advantage does string field theory have over string theory? In all the standard texts I own, there is very little reference made to string field theory yet I know it exists. Can anyone help me understand the motivation for it or...

I had a look at N. Berkovits & L. Motl, Cubic Twistorial String Field Theory, hep-th/0403187 I have to admit that I am (still) not familiar with strings in twistor space, so let me ask a stupid question: What about worldsheet supersymmetry? Is there any? If yes, why does the BRST operator...

If a photon was made from more than one particle, how would quantum field theory be modified?

There are more similarities between New Field Theory as posted at http://www.geocities.com/natureoflight/id5.html (this might be long winded but is only understood if read in full ) and quantum theory than there are differences. The differences where they do exist seem to be infinitesimal yet...

Could it be? This may tax your mind, to grasp and coalate all these concepts that I’m about to lay on you, I know they did with me, when these thoughts first came to my mind. I'm not sure how long ago it was, when I first contemplated this, but I know that it was quite a few years. Then it...

could anyone suggest a good quantum field theory text? i mean a text for a beginner who is familiar with basic quantum mechanics...also, since i am going to study it by myself( i am not taking a physics course ), a text that is simple in language and informal would be great.(i mean, like...

Greetings, I have question regarding the mathematica foundations of QFT. As I understand, the "regular" QM (Schrödinger, Heisenberg...) been developped so that the math underlying it checks out. Is this the case for QFT, or is the theory still "iffy" at points? I know it works well...

I have been cudgeling my brains in a hitherto futile endeavour to discover what exactly there was about “New Field Theory “ or “Aumic” theory as enumerated at http://www.geocities.com/natureoflight/natureoflight that excited such deep animosity , antipathy and mistrust amongst physicists ...

I believe that the Axioms for TQFT were set out by Atiyah in 1990 and that one of the equivalent definitions of a TQFT is in category terms: a TQFT is a functor from the category of n-dimensional cobordisms to the category of Hilbert spaces, satisfying certain conditions. Is anyone familiar...

From the abstract: "An action principle is described which unifies general relativity and topological field theory. An additional degree of freedom is introduced, and depending on the value it takes the theory has solutions that reduce it to (1) general relativity in the Palatini form, (2)...

A recent paper details some new insights for the second quantized string field theory. This has some implications for future models, it appears to be quite sound, but this is based on a confined early viewpoint of a first once over reading, no doubt there will be more questions to follow...

Hi everyone! I would like to post a new thread, related to my research work: QFT on a lattice, i.e. on computers! Is anyone interested?

What's the difference between open string field theory and closed string field theory?

String theory as it has developed is not a field theory. It has more in common with Schroedinger's or Dirac's particle theories than with QED or the Standard Model. There is a real string field theory, and papers about it sometime appear on the arxiv. It started with Sen's conjectures about...

I figured I'd start this forum off with something about the 2 stringy theories of quantum gravity. Both loop quantum gravity and string theory propose that everything is made of 1 dimensional loops, or strings. Both are quantum theories, not classic. This means that strings are not moving around...

Hello! Judge yourself. The unified field is a Faraday–Maxwell field. Maxwell–Lorentz equations (ML-equations) for potentials in standard four-dimensional form are satisfied precisely. This is achieved by involving new subquantum fundamental field sources, strict definition of which requires...

Hello everyone! This is the rebirth of my thread in PF v2.0 entitled "Do you know QM and SR?" Since I started that thread, a 2nd edition of the book (Warren Siegel's Fields) has been released. The url is: http://xxx.lanl.gov/pdf/hep-th/9912205 I'll post some of the more useful comments from...