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2019-12-09: The Doomsday Argument

  • 13:51: ... the answer is maybe: if the universe is closed and has positive curvature then measuring that curvature absolutely will give us the total volume ...
  • 16:49: In short, there's still significantly more evidence in favour of flatness than positive curvature.

2019-12-02: Is The Universe Finite?

  • 03:04: We have 1) a universe with positive curvature.
  • 04:10: ... more gravity, which tends to pull a universe in on itself - it gives positive curvature and closes the universe - making it ...
  • 06:51: Remember that more energy density tends to introduce positive curvature.
  • 07:25: They found the range of models that fit the shape of the power spectrum, and for the most part those pointed to positive curvature.
  • 07:42: The researchers claim a greater than 99% statistical confidence for positive curvature in this analysis.
  • 10:18: ... new study redid part of the Planck analysis to claim this evidence of positive curvature - which the Planck team had themselves decided wasn’t ...

2019-04-03: The Edge of an Infinite Universe

  • 02:46: We call that positive curvature.
  • 03:40: In GR this is anti-de Sitter space because it’s the “opposite” of the positive curvature de Sitter space.

2019-02-20: Secrets of the Cosmic Microwave Background

  • 07:42: ... It tells us the total amount of energy in the Universe Energy results in positive curvature due to its positive gravitational effect On the other hand an expanding ...

2019-01-30: Perpetual Motion From Negative Mass?

  • 07:26: Positive mass causes spacetime to curve inwards – what we call positive curvature.

2016-04-20: Why the Universe Needs Dark Energy

  • 06:13: This is totally inconsistent with the level of positive curvature we'd expect from an infinitely expanding universe.

2016-03-23: How Cosmic Inflation Flattened the Universe

  • 01:51: Draw the same triangle on the surface of a sphere, which has what we call positive curvature, and the angles add up to more than 180.

2015-10-07: The Speed of Light is NOT About Light

  • 11:26: ... number, 18 times the particle horizon, only applies if the universe has positive curvature, making it a hyposphere and the curvature is the maximum that it could ...
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