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Compton Scattering Sum Rules for Massive Vector
Compton Scattering Sum Rules for Massive Vector

Chapter 8, Lecture 1
Chapter 8, Lecture 1

The Attractive Universe Theory
The Attractive Universe Theory

Slide 1
Slide 1

Announcement
Announcement

matter - Osborne High School
matter - Osborne High School

WIMPs and MACHOs - Caltech Astronomy
WIMPs and MACHOs - Caltech Astronomy

Higgs in SUSY - IIT Guwahati
Higgs in SUSY - IIT Guwahati

Gravity Duals for Nonrelativistic Conformal Field
Gravity Duals for Nonrelativistic Conformal Field

... phase diagram, namely, the region in which the temperature is the only important scale, and no dimensionful couplings have turned on (see, e.g., [2]). In trying to use gauge-string duality to study such questions, it seems urgent, then, to match the symmetries to those of the system of interest. The ...
Particle Physics Today 2
Particle Physics Today 2

... masses up to 1000 GeV) Built in old LEP tunnel  … and very intense beams Beam energy 7 TeV, or 7000 GeV ...
F From Vibrating Strings to a Unified Theory of All Interactions
F From Vibrating Strings to a Unified Theory of All Interactions

Strings as hadrons
Strings as hadrons

33 PARTICLE PHYSICS - Wright State University
33 PARTICLE PHYSICS - Wright State University

... among them. (In GUTs: the Unification of Forces, we will discuss how the four forces may be different manifestations of a single unified force.) Perhaps the most important characteristic among the forces is that they are all transmitted by the exchange of a carrier particle, exactly like what Yukawa ...
Role of bianisotropy in negative permeability and left
Role of bianisotropy in negative permeability and left

AdS/CFT to hydrodynamics
AdS/CFT to hydrodynamics

WIMPs and MACHOs - Caltech Astronomy
WIMPs and MACHOs - Caltech Astronomy

... WIMP is an acronym for weakly interacting massive particle and MACHO is an acronym for massive (astrophysical) compact halo object. WIMPs and MACHOs are two of the most popular DARK MATTER candidates. They represent two very different but reasonable possibilities of what the dominant component of th ...
Particle Fever
Particle Fever

... predicting future events, or making inferences about past events. . . . . Although their role is often misunderstood—the informal use of the word “theory,” after all, can mean a guess—scientific theories are constructs based on significant bodies of knowledge and evidence, are revised in light of ne ...
The quantum vacuum as the origin of the speed of... T E P
The quantum vacuum as the origin of the speed of... T E P

The Primordial Abundance of $^ 6$ Li and $^ 9$ be
The Primordial Abundance of $^ 6$ Li and $^ 9$ be

Fall/Winter 1994, Vol. 24, No. 3 - SLAC
Fall/Winter 1994, Vol. 24, No. 3 - SLAC

... be measured solely in terms of their popular press coverage, then probably the most significant development to have sprung from the world of high energy physics in the last few years would not be the discovery of the top quark, or even the demise of the SSC, but rather the development of the World W ...
Probing the Primordial Universe using Massive Fields
Probing the Primordial Universe using Massive Fields

... factor is exp(−πM/H). 17 Thus probing very massive fields is exponentially hard. Although it’s natural to expect fields with M ∼ H, we do not know it for sure. Coupling-wise, direct couplings generically predict much larger signals than gravitational coupling, giving rise to fN L ∼ ǫ or much larger. ...
Slides - Agenda INFN
Slides - Agenda INFN

... suppression of high-pT particles in Au+Au collisions at RHIC, in particular for heavy-quark energy loss: high-pT electrons from c and b decays indicate similar suppression for light and heavy quarks, while the dead-cone effect in pQCD implies a weaker suppression for heavier quarks  this motivates ...
A Solution to the Li Problem by the Long Lived Stau
A Solution to the Li Problem by the Long Lived Stau

Talk1_Nardi
Talk1_Nardi

Fundamental Physics and Cosmology
Fundamental Physics and Cosmology

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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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