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5. Chern-Simons Theories
5. Chern-Simons Theories

... parameterised by ⌧ 2 [0, ). There is one extra caveat that you need to know. While all bosonic field are periodic in the time direction (just like q(⌧ ) in our example above), fermionic fields should be made anti-periodic: they pick up a minus sign as you go around the circle. All of this applies di ...
ATLAS and CMS
ATLAS and CMS

CERN Teacher Programmes: Welcome to CERN!
CERN Teacher Programmes: Welcome to CERN!

... telling him that an electron confined to a space of nuclear dimensions would have kinetic energy sufficient for it to escape. He was prepared to accept that the law of conservation of energy might break down in such situations or that new physics would emerge to overcome the difficulties. In account ...
Large Extra Dimensions - Are you sure you want to look at this?
Large Extra Dimensions - Are you sure you want to look at this?

Dark Matter Experiments
Dark Matter Experiments

Particle Accelerators and Detectors
Particle Accelerators and Detectors

all chapters are collected here in one set
all chapters are collected here in one set

... two thousand years ago Empedocles (490-430 B.C.) suggested that all matter is made up of four elements: water, earth, air and fire. On the other hand, Democritus developed a theory that the universe consists of empty space and an (almost) infinite number of invisible particles which differ from each ...
The Oscillating Neutrino
The Oscillating Neutrino

... quark, the heaviest member of the third ...
energetic particle diffusion in critically balanced
energetic particle diffusion in critically balanced

The Facets of Relativistic Quantum Field Theory1
The Facets of Relativistic Quantum Field Theory1

... Relativistic quantum field theory is widely believed to provide a successful representation of subatomic physics as observed in the presently accessible experimental domain. In the course of time various approaches to quantum field theory have been developed, each focussing on different aspects of t ...
Invariance Principles and Conservation Laws
Invariance Principles and Conservation Laws

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L VII. The Structure of the Atom. By Sir ERNEST RUTHERFORD
L VII. The Structure of the Atom. By Sir ERNEST RUTHERFORD

... whether the presence of such hydrogen atoms can be detected. A detailed account of his experiments will appear later, but it suffices to mention here that undoubted evidence has been obtained by him that some of the hydrogen atoms are set in such swift motion that they are able to produce a visible ...
The Schwarzschild Proton - Hawaii Institute for Unified Physics
The Schwarzschild Proton - Hawaii Institute for Unified Physics

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Quark matter formation in dense stellar objects
Quark matter formation in dense stellar objects

Introduction to the Weak Interaction, Volume 1
Introduction to the Weak Interaction, Volume 1

... that in some experiments, such as that of Young's slits (2), light behaved as i f it were a wave, whereas in others, such as Compton scattering (3), it behaved like a corpuscle . He postulated that electrons might also possess a dual nature , and should thus be able to display wave-like characterist ...
Basin-scale performance of a locally optimized
Basin-scale performance of a locally optimized

Accelerators
Accelerators

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Higgs physics at the LHC and ILC

Dark Matter: A Primer
Dark Matter: A Primer

... COBE (COsmic Background Explorer) launched in 1989, verified two fundamental properties of the CMB: 1) the CMB is remarkably uniform (2.73 K across the sky) and 2) the CMB, and thus the early universe, is a nearly perfect ...
Elementary Particles A Homework 2
Elementary Particles A Homework 2

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A beam of antimatter could help to unravel the secrets of

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[σB] i - CERN Indico

Analysis of the blade structure on the influence of the particle
Analysis of the blade structure on the influence of the particle

... model also reduced the accuracy of the method in different degrees, such as in most of the models, the influence of the rolling friction is not taken into account. Only recently rolling friction was introduced to the discrete element model, its importance is also fully confirmed and in the new model ...
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Grand Unified Theory

A Grand Unified Theory (GUT) is a model in particle physics in which at high energy, the three gauge interactions of the Standard Model which define the electromagnetic, weak, and strong interactions or forces, are merged into one single force. This unified interaction is characterized by one larger gauge symmetry and thus several force carriers, but one unified coupling constant. If Grand Unification is realized in nature, there is the possibility of a grand unification epoch in the early universe in which the fundamental forces are not yet distinct.Models that do not unify all interactions using one simple Lie group as the gauge symmetry, but do so using semisimple groups, can exhibit similar properties and are sometimes referred to as Grand Unified Theories as well.Unifying gravity with the other three interactions would provide a theory of everything (TOE), rather than a GUT. Nevertheless, GUTs are often seen as an intermediate step towards a TOE.The novel particles predicted by GUT models are expected to have energies around the GUT scale—just a few orders of magnitude below the Planck scale—and so will be well beyond the reach of any foreseen particle collider experiments. Therefore, the particles predicted by GUT models will be unable to be observed directly and instead the effects of grand unification might be detected through indirect observations such as proton decay, electric dipole moments of elementary particles, or the properties of neutrinos. Some grand unified theories predict the existence of magnetic monopoles.As of 2012, all GUT models which aim to be completely realistic are quite complicated, even compared to the Standard Model, because they need to introduce additional fields and interactions, or even additional dimensions of space. The main reason for this complexity lies in the difficulty of reproducing the observed fermion masses and mixing angles. Due to this difficulty, and due to the lack of any observed effect of grand unification so far, there is no generally accepted GUT model.
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