Particle Physics Essay Example | Topics and Well Written Essays - 7000 words

Particle Physics - Essay Example hunting for a complete or full particle physics model is still on and experts ar exploring the options of either producing a completely new innovative possibleness or model or constructing an streamlined model merging the relative gravitational force and the Standard Models. This search saw the e intermixnce of a miscellany of new-age models beyond the Standard Model. However, merging these theories is not so simple as it sounds and there argon ab start difficulties that need to be tackled (Green et. al., 1987).These models are build upon different basic assumptions and concepts and this is why one finds it difficult to merge such models. QFT dep nullifys on particle fields embedded in the flat space-time of special theory of relativity whereas, General Relativity accounts gravity as a curvature within space-time that changes as circle moves (Zee A., 2003). The simple option of merging these two theories considering gravity as another particle field seems to end up creating the so-called renormalization problem. As per the traditional understanding, gravity particles would attract each other and add up all the interactions resulting in many infinite values which tailnot be easily cancelled out by methematical interventions (Linde, 1990), thereby ruling out the possibility of getting any sensible or finite results or values. This outcome is in contrast with quantum electrodynamics where, the addition of the interactions results in comparatively lesser infinite values which can be removed or cancelled out via renormalization (Banks, 1985).The long-range forces like the electromagnetic and gravity forces are believed to be meditated by massless particles with spin j 1 and as such, proper description of such massless particles in quantum field theory (QFT) is very important (Aitchison & Hey, 1989). This directionally brings in the fascinating approach of sudden gravity indicating that gravity may not be a component of fund amental physics. However, this concept of emergent gravity theory has been branded to be a misguided one by Steven Weinberg and Edward Witten (See, Jackson & Okun, 2001). Gravity was speculated to be an emergent phenemonon during the 1980s and supporting this, many theories like the Preon theories, Technicolor theories, etc. went on to regard that gluons might be composite. Noticing this, Weinberg & Witten came out with a no-go theorem called the Weinberg-Witten Theorem that excludes the hypothetical composite and emergent theories (Wienberg & Witten, HUTP-80). This theorem indicates that an interacting graviton cannot emerge from an ordinary Quantum Field Theory (QFT) in the alike(p) space-time. The Weinberg-Witten theorem forbids the existence of any massless particles with helicity j1 in any theory with a Lorentz covariant energy-momentum tensor and also restricts charged massless particles of helicity1/2 in any theory with a Lorentz covariant conserved current. This basically p rohibits the existence of both graviton and the gluon but this can be avoided due to gauge symmetries.Taking on from here, this paper proceeds to decode and