Dark Energy Part 2: LCDM Cosmology

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SUMMARY

This discussion focuses on the evidence for dark energy, specifically through the analysis of SCP Union2.1 type Ia supernova data, which supports the existence of a cosmological constant (Λ) in Einstein's equations of general relativity (GR). The ΛCDM model, which incorporates dark energy, leads to a current positive cosmological acceleration, contrasting with the negative acceleration found in the Einstein-deSitter (EdS) cosmology discussed in Part 1. The discussion emphasizes the significance of Λ in understanding the universe's expansion and its implications for cosmological models.

PREREQUISITES
  • Understanding of Einstein's equations of general relativity (GR)
  • Familiarity with SCP Union2.1 type Ia supernova data
  • Knowledge of cosmological models, specifically ΛCDM and EdS
  • Basic grasp of cosmological acceleration concepts
NEXT STEPS
  • Research the implications of the ΛCDM model on cosmic structure formation
  • Study the methodology for analyzing type Ia supernova data
  • Explore the differences between ΛCDM and other cosmological models
  • Investigate the role of dark energy in the universe's expansion history
USEFUL FOR

Astronomers, cosmologists, and physics students interested in the dynamics of the universe, particularly those studying dark energy and its effects on cosmological models.

RUTA
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This is Part 2 of a 3-part series explaining evidence for so-called “dark energy” leading to a current positive cosmological acceleration. The evidence comes from fitting the SCP Union2.1 type Ia supernova data which indicates the existence of a cosmological constant ##\Lambda## (read “Lambda”, thus ##\Lambda##CDM is sometimes written LCDM) in Einstein’s equations (EEs) of general relativity (GR). This ##\Lambda## is referred to as “dark energy” and creates a current positive cosmological acceleration, as we will see below. This is in stark contrast to what we found in Part 1 for Einstein-deSitter (EdS) cosmology (a spatially flat, dust-filled cosmology model). There I showed that the cosmological acceleration in EdS cosmology is always negative. I will use some of the results from Part 1 here to obtain EdS plus ##\Lambda##, aka ##\Lambda##CDM, where “CDM” stands for “cold dark...

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