Aatish Bhatia helped write this video! A big thanks for his help! Here’s his blog: http://www.empiricalzeal.com
The universe is expanding – this we know from looking at red shifts of distant galaxies – but the acceleration of the universe’s expansion is harder to measure. It requires measuring the change of recession velocity over time, and it’s done by comparing Type Ia supernovas as standard candles at different distances, which is how we know the universe is accelerating!
Thanks to everyone who supports MinutePhysics on Patreon!
Link to Patreon supporters here: http://www.minutephysics.com/supporters.html
REFERENCES
Type Ia supernovae
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/snovcn.html
https://en.wikipedia.org/wiki/Type_Ia_supernova
Luminosity Distance
https://en.wikipedia.org/wiki/Luminosity_distance
Hubble diagram for type Ia supernovas (relatively close to earth): http://www.pnas.org/content/101/1/8/F3.expansion
http://www.astronomy.ohio-state.edu/~thompson/1101/lecture_fate_of_universe.html
Straightforward references:
Ryan Foley talking about WFIRST & Dark Energy
Dark Energy FAQ:
Why does dark energy make the universe accelerate?
David Spergel on dark matter & WFIRST
5/31/16 Show feat. Professor David Spergel on His Research Spanning Astrophysical Scales
Slightly-technical references:
Permlutter article (old article but quite well explained & goes into future directions near the end)
http://supernova.lbl.gov/PDFs/PhysicsTodayArticle.pdf
Technical references:
Mukhanov’s Physical Cosmology
http://www.astro.caltech.edu/~george/ay21/readings/Mukhanov_PhysFoundCosm.pdf
Nobel Prize Summary
http://www.nobelprize.org/nobel_prizes/physics/laureates/2011/advanced-physicsprize2011.pdf
Cosmological redshift
https://en.wikipedia.org/wiki/Redshift#Expansion_of_space
MinutePhysics is on Google+ – http://bit.ly/qzEwc6
And facebook – http://facebook.com/minutephysics
And twitter – @minutephysics
Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!
Created by Henry Reich