Cosmology: Galileo to Gravitational Waves - with Hiranya Peiris
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In the last decade we have started to answer ageo-old questions like the age of the Universe and what it contains. Hiranya Peiris unravels the detective story, explaining what we know and how we know it. Watch the Q&A: https://youtu.be/63JbKXfedRE Subscribe for regular science videos: http://bit.ly/RiSubscRibe Modern fundamental physics contains ideas just as revolutionary as those of Copernicus or Newton; ideas that may radically change our understanding of the world; ideas such as extra dimensions of space, or the possible existence of other universes. Testing these concepts requires enormous energies, far higher than what is achievable by the Large Hadron Collider at CERN, and in fact, beyond any conceivable Earth-bound experiments. However, at the Big Bang, the Universe itself performed the ultimate experiment and left clues and evidence about what was behind the origin of the cosmos as we know it, and how it is evolving. And the biggest clue is the afterglow of the Big Bang itself. In the past decade we have been able to answer age-old questions accurately, such as how old the Universe is, what it contains, and its destiny. Along with these answers have also come many exciting new questions. Join Hiranya Peiris to unravel the detective story, explaining what we have uncovered, and how we know what we know. Hiranya Peiris is Professor of Astrophysics in the Astrophysics Group in the Department of Physics and Astronomy at University College London. She is also the Principal Investigator of the CosmicDawn project, funded by the European Research Council She is also a member of the Planck Collaboration and of the ongoing Dark Energy Survey, the Dark Energy Spectroscopic Instrument and the Large Synoptic Survey Telescope. Her work both delves into the Cosmic Microwave Background and contributes towards the next generation galaxy surveys that will yield deep insights into the evolution of the Universe. Watch more science videos on the Ri Channel http://richannel.org The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://richannel.org/home/editorial-policy Subscribe for the latest science videos: http://richannel.org/newsletter
Comments
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excellent......informative
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Superb speech ........................ I wonder about - have their been any relation established between this energy to matter thing and reproduction ? I mean how does reproduction happen at particle level?
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sub; change in perspectivesDo not throw away Space Baby into black-hole or gravity graveyard ! This mind-set absurdity -chaos and Big-Bang must change to conscious Sprit. Change and Exchange need of today's intellectual Wisdom
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Very educational
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Invisible matter, please, give me strength...now we go from gigo theory to perpetuate the error based on the dark energy theory.
The model clearly shows electromagnetic reaction... so simple it can't be seen my biased minds (stated numerous time in the lecture) of the current academia.
Get a magnet, get a laser, you will make your own wave, and gravity will have nothing to do with...smh -
quite interesting..........good channel
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how can a spherical wave spiral
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Hiranya Peiris I want to believe. You were a wonderful story teller. Who need fairy tail when hundreds of thousand capable & highly paid by borrowed money spend their entire life to weave such elaborate tails for grown up children. Sadly once again same old conspired fictions regurgitated by capable sales person. I want to believe, but So far no intelligent persons not even the scientist have responded to my questions. What is structure of photon, electron, nuclei, and how do they interact with gravity?. What is heat, magnetic flux and gravity. Ignorant may consider these question irrelevant, but these are what you used in your lecture presenting conspired fiction as fact. MG1
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34:39 that girl was so beautiful
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24:15 man, I hoped she would drop some s1ck Skrillex there.
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Nice lecture, but, honestly, it is riddle with inconsistencies:
0:40. Cosmology cannot study the origin and ultimate fate of the Universe. Origin and End are religious concepts, not scientific ones.
0.52. Cosmology didn´t exist by its own, it was part of the Natural Phylosofy.
1.00. Not medieval, it is from the Rennaisance.
2:48. Not at all. Even the most redshifted galaxies look like our own, same as the other near ones.
4:44. It has to be explained which mechanism links temperature with density.
4:57. The date of the CMBR is arbitrary, and can´t be independtly contrasted with another measurement.
5.07. The anisotropies don´t correlate exactly with the distribution of mass in the Universe. And don´t forget that we can´t see 40% of it because the presence of the Milky Way.
5.25. This statement can´t be falsified, as even in the most meaningless static you always can find patterns of distribution which are equally random and homogeneous.
6.10. Not from all over the sky. Again, the galaxy block us a considerable amount of the observable horizon.
7.19. Tha assumption that the CMBR came from the Big Bang shows no clear link between both elements. I see white noise in the sky, nothing relates to this mythical origin of the Universe. Where is the cause and the effect?
7.22. Unhealthy fixation with the Nobel prize. It is mentioned several times over the lecture.
9:21. Again the Nobel prize fetish, and now with the addition of group thinking.
10.20 Computers are useful, but statistical massage of the data is a venomous path.
10:46 How did the WMAP erase the Milky Way, or could peer through it?
11.52. The early Universe was so hot that.. its radiation is only three degrees Celsius above absolute zero.
I can go on and on, but I don´t have to. All that data which is referred to in the lecture is real and actually exists, but my fear is that over theoryzing upon it made a poor explanation of the natural reality beyond our planet. -
Props to the speaker! This talk was so thoughtfully put together, I enjoyed/was interested every minute of it. Thank you for these talks and this wonderful channel.
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Outstanding lecture, thank you
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the first (and as far as I know the only,) presentation that explained and let me understand the distortion introduced by the projection used in the CMB map.
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The magic phrase for any exposition "(first) WHAT we know and (then) HOW we know it" wonderfully done here. Thank you.
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This was great!
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Wonderful talk.
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One of the clearest lectures on such a complex subject. Thank you.
51m 27sLenght
234Rating