end_of_universe

end_of_universe - Announcements Homework #10 is due today...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Announcements • Homework #10 is due today • Review for test #4 on Friday Dec. 9 2:00 – 3:00pm • Test #4 on Tuesday, Dec 13 7:30 – 8:45am
Background image of page 1

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

View Full DocumentRight Arrow Icon
The End of the Universe How will the Universe end? Is this the only Universe? What, if anything, will exist after the Universe ends?
Background image of page 2
Some say the world will end in fire, Some say in ice. From what I’ve tasted of desire I hold with those who favor fire. But if I had to perish twice, I think I know enough of hate To know that for destruction ice is also great And would suffice. Robert Frost
Background image of page 3

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

View Full DocumentRight Arrow Icon
Universe started out very hot (Big Bang), then expanded: How it ends depends on the geometry of the Universe:
Background image of page 4
The Geometry of Curved Space Possibilities: 1) Space curves back on itself (like a sphere). "Positive" curvature. Sum of the Angles > 180
Background image of page 5

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

View Full DocumentRight Arrow Icon
2) More like a saddle than a sphere, with curvature in the opposite sense in different dimensions: "negative" curvature. 3) A more familiar flat geometry. Sum of the Angles < 180 Sum of the Angles = 180
Background image of page 6
We saw that a black hole affects the geometry of space around it. Likewise, the geometry of the universe depends on the total mass and energy of the universe (including dark energy). There is a critical amount, which if exceeded, implies positive curvature, and if not met, implies negative curvature. If right at the critical amount, get flat universe. Latest measurements imply flat universe.
Background image of page 7

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

View Full DocumentRight Arrow Icon
The Geometry of the Universe determines its fate
Background image of page 8
Case 1: high density Universe, spacetime is positively curved Result is “Big Crunch” Fire
Background image of page 9

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

View Full DocumentRight Arrow Icon
Cases 2 or 3: open Universe (flat or negatively curved) Current measurements favor an open Universe Result is infinite expansion Ice
Background image of page 10
1) The Primordial Era 2) The Stelliferous Era 3) The Degenerate Era 4) The Black Hole Era 5) The Dark Era The Five Ages of the Universe
Background image of page 11

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

View Full DocumentRight Arrow Icon
1. The Primordial Era: 10 -50 - 10 5 y Something triggers the Creation of the Universe at t=0
Background image of page 12
Inflation A problem with microwave background:
Background image of page 13

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

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 38

end_of_universe - Announcements Homework #10 is due today...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online