Seeing the Invisible: Observing the Dark Side of the Universe
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Transcript of Seeing the Invisible: Observing the Dark Side of the Universe
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Seeing the Invisible: Observing the Dark Side of the Universe
Sarah BridleUniversity College London
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What we see
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What we don’t see
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What we don’t see
Missing matter: Dark Matter(matter that doesn’t shine)
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What we don’t seeMissing energy: Dark Energy(energy that is not matter)
Missing matter: Dark Matter(matter that doesn’t shine)
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Supernovae as Standard Candles
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Big Bang 5 billion years ago Today
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Why is the Universe Accelerating?
• Einstein’s cosmological constant
• A new fluid called Dark Energy
• General Relativity is wrong
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Seeing the Invisible:Is there something in between us and
the wall and tree?
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Using the bending of light to see the invisible
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Just one Equation from General Relativity
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90 years ago
Eddington confirmed Einstein’s prediction during a solar eclipse
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Average galaxies together to measure weak gravitational shear
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Simulated Dark Matter Map
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Gravitational Lensing Map
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Universe was 0.2 Gyr old
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Universe was 1 Gyr old
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Universe was 4.7 Gyrs old
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Today (13.6 Gyr)
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Map in 3d
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Typical star used for finding telescope response
Typical galaxyused for lensing
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Gravitational Lensing
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Atmosphere and Telescope
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Pixelisation
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Noise
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www.great08challenge.info
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Results from the HST COSMOS Survey
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The Largest ever Survey with HST
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The Visible The Invisible
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In 3 Dimensions
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The Future
JDEM
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Future prospects
• Cosmic microwave background radiation– Distribution of dark matter at early times
• Distribution of galaxies – Some clues to distribution of matter
• Galaxy velocities– Galaxies fall towards dark matter clumps
• Gravitational lensing
The Dark Energy Survey
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The camera: DECam
Hexapod
Corrector Lenses
CCDReadout
Filters Shutter
Mechanical Interface of DECam Project to the Blanco
Focal plane (detector)
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Ground vs Space
weak lensing shear
space
ground
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HST COSMOS
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Why is the Universe Accelerating?
• Einstein’s cosmological constant
• A new fluid called Dark Energy
• General Relativity is wrong