I tweeted this yesterday, but it deserves a blog entry: Gravitational waves discovery now officially dead : Nature News & Comment. A team of astronomers that last year reported evidence for gravitational waves from the early Universe has now withdrawn the claim. A joint analysis of data recorded by the team's BICEP2 telescope at the South … Continue reading Gravitational waves discovery now officially dead
Tag: Gravitational wave
Cosmic inflation appears to have shifted from settled science back to speculation
You can get background on what I'm talking about in this post here and here. Probably the best thing to do is let the experts weigh in on this. https://twitter.com/DavidSpergel/status/513848952513642497 https://twitter.com/seanmcarroll/status/513858867327823873 https://twitter.com/seanmcarroll/status/513869684647530496 https://twitter.com/AstroKatie/status/514040997139865600 It's interesting to note that the empirical evidence from BICEP2 has never been called into question, only the interpretation of that evidence. … Continue reading Cosmic inflation appears to have shifted from settled science back to speculation
BICEP2 team publishes results, backpedals on certainty
The BICEP2 team have officially published their results. They had announced to much fanfare back in March, that they had detected primordial gravitational waves, and hence cosmic inflation. But the results have increasingly been met with doubt, primarily centered on the possibility of interstellar dust causing the observed results. From a New Scientist article on the published paper: It … Continue reading BICEP2 team publishes results, backpedals on certainty
The Big Bang’s Identity Crisis – The Nature of Reality
Think of the Big Bang, and you probably imagine a moment in time when matter, energy and space itself all burst into existence at once. Yet many astrophysicists now believe that the “Big Bang” was actually two distinct events: first the inaugural instant of space and time, and second the generation of most of the … Continue reading The Big Bang’s Identity Crisis – The Nature of Reality
Growing doubt that gravitational waves were actually detected
Nature has an article up describing the problems with the BICEP2 results that are now being identified by various scientists. It's actually the second one I've seen them publish on this. The astronomers who this spring announced that they had evidence of primordial gravitational waves jumped the gun because they did not take into proper … Continue reading Growing doubt that gravitational waves were actually detected
xkcd: Cosmologist on a Tire Swing
A few years ago the "it's senseless to ask what came before the big bang because there was no before" meme was hot. I remember Stephen Hawking saying it in his documentary a year or two ago. There now seems to be a good amount of push-back from the rest of the cosmology community to this certitude. … Continue reading xkcd: Cosmologist on a Tire Swing
PHD Comics: Cosmic Inflation Explained
So, even though I already linked to two sources about cosmic inflation this week, this is good enough that I'm also going to throw it in. It's fascinating to me that the large scale structure of our universe is ultimately caused by quantum fluctuations in the earliest moments of the big bang. Click through for … Continue reading PHD Comics: Cosmic Inflation Explained
Primers on detecting primordial gravity waves and cosmic inflation
First, Minute Physics takes a shot at explaining what the BICEP2 team actually found and how it relates to gravitational waves. I think I'm going to have to watch this a second time to pick up everything. http://www.youtube.com/watch?v=4IlBNJbCzfk And Ethan Siegel has an in-depth discussion of cosmic inflation at his Starts With A Bang site.
First Direct Evidence of Cosmic Inflation – SpaceRef
Wow! There were lots of rumors about this over the weekend. Turns out that, in this case, the rumors were spot on. Almost 14 billion years ago, the universe we inhabit burst into existence in an extraordinary event that initiated the Big Bang. In the first fleeting fraction of a second, the universe expanded exponentially, … Continue reading First Direct Evidence of Cosmic Inflation – SpaceRef
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