33-9 - The Energy Budget of the Universe Remember matter is...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Energy * Budget of the Universe Dark Energy , from the Cosmological Constant Ordinary (“Baryonic”) Matter, at most 5% of critical density ( Ω >1 Universe ends in big crunch) Ω =1 “Critical” density (flat Universe) CMB + Supernovae say this is right! ( Ω <1, Universe ends in big fizzle) “Best estimate” density of all matter in the Universe Stars are less than 1% of critical density “Dark Matter” = 5/6 of matter in the Universe (new particles) Most gravitating matter is dark (not in the form of shining stars). Most of this, even, isn’t in a familiar form of particle (not nuclei). And most of the energy density in Universe isn’t mass at all! * Remember, m atter is a form of E nergy: E=mc 2 (more on this later)
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Cosmological 'Conclusions'... Universe is expanding (we ve known this since the 1920 s) Not enough matter to gravitationally arrest the expansion Only about 30% of the necessary total Most of the gravitating matter is in a form as yet unidentified
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern