
20220817: What If Dark Energy is a New Quantum Field?
 06:25: ... second reason is the socalled Hubble tension.When we measure the Hubble constant  the current rate of expansion of the universe, based on supernova ...


20210316: The NEW Crisis in Cosmology
 04:42: ... can give us the expansion rate. The Planck team calculated a Hubble constant of 67.6 km/s/Mpc  let’s not worry about the ...
 05:31: ... method. A couple of years ago his team published a new Hubble constant of 73 and a half.+/ 1.5 ...
 09:17: ... in turn gave Adam Reiss and team a refined measure of the Hubble constant. So what do you think  do the supernova and Planck results ...
 10:08: ... seem to be coming on the side of the Planck result  a Hubble constant in the high ...
 10:40: ... and so the uncertainty is large  but published results give a Hubble constant in the low 70s  so in agreement with the supernova guys. ...
 11:57: ... waves from merging black holes to measure the Hubble constant. These waves get stretched by the expanding universe, just ...


20200504: How We Know The Universe is Ancient
 06:22: ... rate is encapsulated in something we call the Hubble constant, which just tells how fast a galaxy is moving away from us given its ...
 08:58: ... had been using to get distances to galaxies, and so calculate the Hubble constant and the age of the universe. It’s similar to the Cepheid method because ...
 09:39: ... He eventually concluded that the expansion rate of the universe – the Hubble constant – was about 75 kilometers per second per megaparsec. Now, don't worry ...


20190220: Secrets of the Cosmic Microwave Background
 14:23: ... for this is that the authors of that paper use a different value for the Hubble constant See, the quoted distance is the comoving distance It's the size the ...


20190207: Sound Waves from the Beginning of Time
 01:04: ... talked about one of those properties in a recent episode, The Hubble constant, and about a growing conflict in its measured value, which hints at ...


20190124: The Crisis in Cosmology
 00:02: The search for a single number, the Hubble constant,...
 01:12: We encapsulate the expansion of the universe with a single number, called the Hubble constant.
 02:05: ...used to measure this fundamental parameter, the Hubble constant,...
 02:10: But before we get to that, let's talk about the great quest to measure the Hubble constant.
 02:39: If the Hubble constant were, say, 75 km per second per megaparsec,...
 02:51: Historically, measurement of the Hubble constant...
 04:15: ...and the precise measurement of the Hubble constant...
 04:59: ...astronomers were using these supernovae to better nail down the Hubble constant.
 05:44: Recent teams have now narrowed down the Hubble constant to 73.5 ± 1,7...
 07:54: So,... how can the CMB tell us the Hubble constant?
 09:09: So, how do you get the Hubble constant, i.e., the current expansion rate, from all of this?
 12:26: The answer will depend on whether the more correct measurement of the Hubble constant...


20160615: The Strange Universe of Gravitational Lensing
 05:57: ... distance measurements have allowed us to measure the Hubble Constant, which tells us the rate of expansion of the universe, independently ...


20160427: What Does Dark Energy Really Do?
 08:41: The Hubble Constant is just the Hubble Parameter for the present day.


20160413: Will the Universe Expand Forever?
 07:18: The expansion rate now is what we call the "Hubble constant." It's around 70 kilometers per second per megaparsec.
