what is meant by dark energy?

6 Answers

  • In physical cosmology, dark energy is a hypothetical form of energy that permeates all of space and tends to increase the rate of expansion of the universe. Assuming the existence of dark energy is the most popular way to explain recent observations that the universe appears to be expanding at an accelerating rate. In the standard model of cosmology, dark energy currently accounts for almost three-quarters of the total mass-energy of the universe.

    Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously,and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space. In fact, contributions from scalar fields, which are constant in space, are usually also included in the cosmological constant. The cosmological constant is thought to arise from the vacuum energy. Scalar fields which do change in space are hard to distinguish from a cosmological constant, because the change may be extremely slow.

    High-precision measurements of the expansion of the universe are required to understand how the speed of the expansion changes over time. The rate of expansion is parameterized by the cosmological equation of state. Measuring the equation of state of dark energy is one of the biggest efforts in observational cosmology today.

  • We use the word dark to mean we don’t know.

    Our measures, mostly observations and mathematics, tell us that there must me both more mass and energy in the universe than we can account for.

    We call this mysterious stuff dark matter and / or dark energy.

    We will suss it out in a few thousand years I’m sure.

    Humans are still at the beginning of our learning curve.

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    what is meant by dark energy?

  • The universe is accelerating in its expansion. Something must be providing that pushing force. Dark energy is a proposed explanation for this force.

  • An as yet unknown and unidentified form of energy that pervades the universe and produces a force that counteracts the gravitational attraction between galaxies.

    Dark energy is thought to be responsible for the accelerating universe.

  • Dark Energy is hypothetical yet…

    It is the energy that is assumed to be responsible for the expansion of the universe..

    Check this out if u find time!

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