Undergrad Is dark energy pushing or is it a mirror concept of gravity?

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SUMMARY

The discussion centers on the nature of dark energy and its role in the universe's expansion. It is established that dark energy has a constant energy density, which became significant over the last 5 billion years, leading to the accelerated expansion of the universe. The conversation highlights that dark energy cannot be a pulling force like gravity; instead, it acts as a repulsive force that dominates as the universe expands. Evidence supporting the existence of dark energy includes observations of cosmic expansion that cannot be explained solely by matter density.

PREREQUISITES
  • Understanding of dark energy and dark matter concepts
  • Familiarity with cosmological models and the Big Bang theory
  • Knowledge of energy density and its implications in astrophysics
  • Basic grasp of gravitational forces and their effects on cosmic structures
NEXT STEPS
  • Research the implications of dark energy on cosmic expansion using the Lambda Cold Dark Matter model
  • Explore observational evidence for dark energy, including supernovae and cosmic microwave background radiation
  • Study the differences between dark energy and dark matter, focusing on their roles in the universe
  • Investigate the concept of vacuum energy and its relationship to dark energy
USEFUL FOR

Astronomers, astrophysicists, and students interested in cosmology, as well as anyone seeking to understand the dynamics of the universe's expansion and the fundamental forces at play.

  • #31
@PeterDonis Ok so you say scalar fields can do this, IIRC examples of known scalar fields would be also the B field (static), E field(static) , EM field , gravity , others?
Can the E, B, EM or gravity fields do anything similar to what is happening to the dark/vacuum energy ?
Let me ask one more thing with regards to the topic at hand, normally we associate a field with a source, like the E field and it's source charge or gravity and mass , so the way I imagine in ordinary conditions if I have a object that has charge and mass it is a source for both E field and gravity
What is the source for dark/vacuum energy?
Is the source known or hypothetical as of now?

It seems that unlike matter and the fields associated with matter the source for dark energy seems to be everywhere at once and fundamentally linked to space time.
 
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  • #32
artis said:
IIRC examples of known scalar fields would be also the B field (static), E field(static) , EM field , gravity , others?
None of these are scalar fields. They are vector fields or tensor fields, they "have directions".
artis said:
What is the source for dark/vacuum energy?
It doesn't need one. That's why it is called vacuum energy or cosmological constant or similar. It's there even in vacuum.
 

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