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Student Number 93222038
Author Kun-Feng Shie(Á©[®p)
Author's Email Address No Public.
Statistics This thesis had been viewed 1422 times. Download 605 times.
Department Physics
Year 2006
Semester 1
Degree Master
Type of Document Master's Thesis
Language English
Title Torsion Cosmology
Date of Defense 2007-01-05
Page Count 54
Keyword
  • dark energy
  • Torsion
  • Abstract Two independent groups, Lawrence Berkeley National Laboratory and the High-Z Supernova Search Team, have observed the presently accelerating expansion of the universe. Their results show that there should be some kind of energy with a negative pressure in our universe called dark energy. This negative pressure can resist the attraction of gravity and make the expansion of the universe accelerate. Some wellknown guesses for dark energy are the cosmological constant and quintessence. All the
    proposed models still have many unsolved problems. In this thesis we discuss another
    possibility for explaining the accelerating universe: dynamic scalar torsion, which is
    based on the Poincar´e gauge theory. The effect of torsion can not only make the expansion rate oscillate, but also force the universe to naturally have an accelerating expansion in some periods and a decelerating expansion at other times. In addition to explaining the accelerating expansion, the effect of torsion could avoid some problems which occur in some other models. In this thesis we include some diagrams to explain
    our model and to compare with the data of the Type Ia supernovae.
    Table of Content 1 Introduction......................................... 1
    2 Background........................................... 3
    2.1 Einstein Equation...................................3
    2.2 Cosmological Constant Term......................... 5
    2.3 Vaccum Energy Density ............................. 7
    2.4 Quintessence ...................................... 9
    2.5 The Early Investigation of Torsion Cosmology ...... 9
    3 A Brief History of Poincar´e Gauge Theory........... 11
    3.1 Poincar´e Gauge Theory ........................... 11
    3.2 The Early Research of PGT ........................ 14
    4 The Field Equations with the Torsion Effect......... 15
    4.1 The Original Field Equations...................... 15
    4.2 Translation .......................................19
    4.3 Field Equations for Torsion Cosmology .............21
    5 Numerical Analysis ..................................24
    5.1 A Preliminary Analysis of the Equations ...........24
    5.2 Numerical Demonstration ...........................27
    5.3 The Case for the Universe ........................ 32
    5.4 Other Cases........................................40
    6 Conclusion.......................................... 50
    Bibliography ..........................................52
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    Advisor
  • James M. Nester(¿´µ¯S)
  • Files
  • 93222038.pdf
  • approve immediately
    Date of Submission 2007-01-18

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