A universe-less-ordinary

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

Disclaimers: I shall not answer ... 2

Disclaimers: I shall not answer ... If God created the world, who created God? 2

Disclaimers: I shall not answer ... If God created the world, who created God? or when Stephen says something about God.... 2

What I am going to talk about... Credit to Huifen & Chew Lin for this XKCD art 3

What I am going to talk about... Why are we searching for extra dimensions? Credit to Huifen & Chew Lin for this XKCD art 3

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 3

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 3

Strong vs Electromagnetic 102 4

Strong vs Electromagnetic 102 Strong vs Weak 105 4

Strong vs Electromagnetic 102 Strong vs Weak 105 Strong vs Gravity 1039 4

Strong vs Electromagnetic 102 Strong vs Weak 105 Strong vs Gravity 1039 Why is gravity so “weak”? 4

Coupling Strength ? Strong Nuclear Force Weak Nuclear Force Gravity Electromagnetism 10 3 10 16 10 18 Energy (GeV) 5

Coupling Strength ? Strong Nuclear Force Weak Nuclear Force String or M- Theory Gravity Electromagnetism 10 3 10 16 10 18 Energy (GeV) 5

Coupling Strength ? Strong Nuclear Force Weak Nuclear Force String or M- Theory Gravity Electromagnetism or Loop Quantum Gravity 10 3 10 16 10 18 Energy (GeV) 5

Small & Large Extra Dimensions 6

Small & Large Extra Dimensions Kaluza Klein Theory (1920s) 6

Small & Large Extra Dimensions Kaluza Klein Theory (1920s) Arkani-Hamed, Dvali & Dimopolous (ADD) Randall-Sundrum (RS) 6

General Relativity in a nutshell “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) 7

Source: WMAP 9

Temperature for the ﬂuctuations: 0.0005K Source: WMAP & Planck Satellite Images 11

Cosmic The ﬁrst peak Microwave measures the Background curvature of Power the universe: Spectrum Our Universe is ﬂat Gravitational Waves interacting with CMB 13

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. 17

A few years later ... 18

A few years later ... Phys.Rev. D66 (2002) 104010 18

“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 19

A universe-less-ordinary

by Bernard Leong on Sep 16, 2010

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