1 / 8

Dark Energy

Dark Energy. Theorized force opposing gravity. This force would accurately explain the current accelerating expansion of the universe. Possible it might be related to the inflation period of the early universe. What is dark energy?. Supporting Evidence.

gerard
Télécharger la présentation

Dark Energy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dark Energy

  2. Theorized force opposing gravity. This force would accurately explain the current accelerating expansion of the universe. Possible it might be related to the inflation period of the early universe. What is dark energy?

  3. Supporting Evidence • Measurement of supernovae type Ia, SN1997ff, actually predicted to be brighter than it appears in space, thus providing evidence that universe is expanding.

  4. other Defining Properties • Dark Energy is said to be uniform through out space

  5. Supporting Fact • CMB anisotropy indicate the universe is flat. • Thus, matter density + energy density = critical density. • But, matter density only contributes 1/3 of the critical density! • So, in order for energy density to have escaped detection it must be distributed uniformly.

  6. Importance of Dark Energy • Currently it is estimated that the composition of the universe is approx. 70% dark energy • 25% dark matter • 2-5 % matter (stars, H, He, neutrinos, heavy elements)

  7. Importance of Dark Energy • Possibly predict the future of the universe. • If repulsion from dark energy becomes strong, could potentially lead to a Big Rip. • Or, a variable dark energy might fade away and then flip into a future that pulls the universe together rather then pushing it apart, into a Big Crunch

  8. References • Dark Energy and the New Cosmology, http://supernova.lbl.gov/~evlinder/turner.pdf • Dark Energy by Wikipedia http://en.wikipedia.org/wiki/Dark_energy

More Related