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Yang-Mills Condensates in Cosmology

Gornov, Nikolay LU (2016) FYTK02 20161
Theoretical Particle Physics
Abstract
The cosmological constant is one of bigger mysteries in modern fundamental physics and cosmology. In this work we investigate one of the possible interpretations for the cosmological constant. The model a studies spatially-homogeneous mode of the Yang-Mills field known as the Yang-Mills condensate and throughout the work we discuss the dynamics and the time evolution of the homogeneous isotropic Yang-Mills condensate in the expanding Universe. The description of the Yang-Mills field is given for a completely classical field and an effective Lagrangian in the one-loop approximation. The stability of those solutions has been studied in both perturbative and non-perturbative cases. The other approach featuring the functional renormalization... (More)
The cosmological constant is one of bigger mysteries in modern fundamental physics and cosmology. In this work we investigate one of the possible interpretations for the cosmological constant. The model a studies spatially-homogeneous mode of the Yang-Mills field known as the Yang-Mills condensate and throughout the work we discuss the dynamics and the time evolution of the homogeneous isotropic Yang-Mills condensate in the expanding Universe. The description of the Yang-Mills field is given for a completely classical field and an effective Lagrangian in the one-loop approximation. The stability of those solutions has been studied in both perturbative and non-perturbative cases. The other approach featuring the functional renormalization group method is discussed in last part of this work and a non-perturbative Yang-Mills Lagrangian is retrieved. This result is compared to the one-loop toy model. The conclusion discusses the cosmological implications of the condensate and its possible connection to the Dark Energy. (Less)
Popular Abstract (Swedish)
I den här uppsatsen diskuterar vi flera möjligheter om hur man kan förklara den kosmologiska konstanten. År 1998 genomfördes observationer av typ 1a supernovor som visade att universums expansionshastighet ökar. Det här fenomenet blev kallat mörk energi. Sedan dess har flera olika hypoteser framlagts. Vi ska studera en teori som använder Yang-Mills-fält som en mekanism som hjälper att klargöra flera problem med det här fenomenet. Vi finner en ny form för fältens effektiva Lagrangetäthet, som inte använder störningsteori men ger snarlika resultat som de kända approximationerna.
Please use this url to cite or link to this publication:
author
Gornov, Nikolay LU
supervisor
organization
course
FYTK02 20161
year
type
M2 - Bachelor Degree
subject
keywords
Yang-Mills, dark energy, cosmological constant, FRG, functional renormalization group
report number
LU TP 16-46
language
English
id
8889667
date added to LUP
2016-08-29 16:08:13
date last changed
2016-08-29 16:08:13
@misc{8889667,
  abstract     = {The cosmological constant is one of bigger mysteries in modern fundamental physics and cosmology. In this work we investigate one of the possible interpretations for the cosmological constant. The model a studies spatially-homogeneous mode of the Yang-Mills field known as the Yang-Mills condensate and throughout the work we discuss the dynamics and the time evolution of the homogeneous isotropic Yang-Mills condensate in the expanding Universe. The description of the Yang-Mills field is given for a completely classical field and an effective Lagrangian in the one-loop approximation. The stability of those solutions has been studied in both perturbative and non-perturbative cases. The other approach featuring the functional renormalization group method is discussed in last part of this work and a non-perturbative Yang-Mills Lagrangian is retrieved. This result is compared to the one-loop toy model. The conclusion discusses the cosmological implications of the condensate and its possible connection to the Dark Energy.},
  author       = {Gornov, Nikolay},
  keyword      = {Yang-Mills,dark energy,cosmological constant,FRG,functional renormalization group},
  language     = {eng},
  note         = {Student Paper},
  title        = {Yang-Mills Condensates in Cosmology},
  year         = {2016},
}