A universe-less-ordinary
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A Universe Less Ordinary Searching for Extra Dimensions in the Background Bernard Leong Theoretical Physicist “for hire” in Hackerspace SG @bleongcw / bleongcw (at) gmail.com 1
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Modern ideas in theoretical physics revolve around the concept of extra-dimensions and the attempt to unify the four fundamental forces of nature with string theories. Our Universe has been a great & extraordinary laboratory where we formulate hypotheses to disprove these ideas. Can we find extra dimensions via the cosmic microwave background radiation left over from the first three minutes in our Universe? How do we test such an idea using modern satellite technologies like Planck and WMAP? The story started from a doctorate thesis & ends with a satellite that has been recently launched into space.
Transcript of A universe-less-ordinary
A Universe Less OrdinarySearching for Extra Dimensions in the Background
Bernard LeongTheoretical Physicist “for hire” in Hackerspace SG
@bleongcw / bleongcw (at) gmail.com
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Disclaimers: I shall not answer ...
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Disclaimers: I shall not answer ...
If God created the world, who created God?
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or when Stephen says something about God....
Disclaimers: I shall not answer ...
If God created the world, who created God?
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What I am going to talk about...
Credit to Huifen & Chew Lin for this XKCD art
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What I am going to talk about...
Why are we searching for extra dimensions?
Credit to Huifen & Chew Lin for this XKCD art
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What I am going to talk about...
Why are we searching for extra dimensions?
What is the story of Our Universe so far?
Credit to Huifen & Chew Lin for this XKCD art
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What I am going to talk about...
Why are we searching for extra dimensions?
What is the story of Our Universe so far?
How do we find extra dimensions in the cosmic microwave background?
Credit to Huifen & Chew Lin for this XKCD art
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Strongvs Electromagnetic
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Strongvs Electromagnetic
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Strongvs Weak
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Strongvs Electromagnetic
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Strongvs Weak
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Strongvs Gravity
1039
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Strongvs Electromagnetic
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Strongvs Weak
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Strongvs Gravity
1039
Why is gravity so “weak”?
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Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
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Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
5
Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
5
Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
5
Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
String or M-Theory
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Energy (GeV)
Coup
ling
Stre
ngth
Strong Nuclear Force
Weak Nuclear Force
Electromagnetism
103 1016
Gravity
?
1018
or Loop Quantum Gravity
String or M-Theory
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Small & Large Extra Dimensions
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Small & Large Extra Dimensions
Kaluza Klein Theory (1920s)
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Small & Large Extra Dimensions
Kaluza Klein Theory (1920s)
Arkani-Hamed, Dvali & Dimopolous (ADD)Randall-Sundrum (RS)
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Small & Large Extra Dimensions
Kaluza Klein Theory (1920s)
Arkani-Hamed, Dvali & Dimopolous (ADD)Randall-Sundrum (RS)
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“Matter teaches Space how to bend &Space teaches matter how to move.”
- J. A. Wheeler“Relativistische Zeitdiiatation eines künstlichen Satelliten”, Friedwardt Winterberg, Astronautica Acta (1955)
General Relativity in a nutshell
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Source: WMAP
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Source: WMAP & Planck Satellite Images
Temperature for the fluctuations:
0.0005K
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The first peak measures the curvature of the universe:Our Universe
is flat
Gravitational Waves
interacting with CMB
Cosmic Microwave
Background Power
Spectrum
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Extra dimensions act as a brake and slow down the effect of gravity on polarization. If no polarization signal is observed, one possibility is that the extra
dimension is inhibiting the gravitational wave.
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A few yearslater ...
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A few yearslater ...
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Phys.Rev. D66 (2002) 104010
A few yearslater ...
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“The subject is a very much difficult and intricate one than at first, one is inclined to think and I feel that I have not succeeded in catching the keynote. When that is found, the various results
here given will no doubt appear in their real connection with one another, perhaps even as immediate consequences of a thoroughly adequate conception of the question.”
- Tait
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