Trapped in an infinite extra dimension
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1 Trapped in an infinite extra dimension Damien George Nikhef theory group Nikhef Jamboree th December 2009 Amsterdam
2 Extra dimensions D.P. George Trapped in an infinite extra dimension 2/11 Beyond the standard model and general relativity what else could there be?
3 Extra dimensions D.P. George Trapped in an infinite extra dimension 2/11 Beyond the standard model and general relativity what else could there be? Perhaps an extra dimension, an extra direction in space. We are thinking about an infinitely large extra dimension. z y x w?
4 How do I think about this? D.P. George Trapped in an infinite extra dimension 3/11 An infinite extra dimension? Pool table: Balls only travel in two directions. Trapped to the table. But the table exists in 3D!
5 How do I think about this? D.P. George Trapped in an infinite extra dimension 3/11 An infinite extra dimension? Pool table: Balls only travel in two directions. Trapped to the table. But the table exists in 3D! Certain things in pool (ball spin) can be explained easily using 3D. Imagine our universe is the table. Perhaps we can describe things better if we accept 4D (plus time). How to test? Hit the balls hard and with spin they may come off the table: disappear into the extra dimension!
6 The very first extra-dimensional world D.P. George Trapped in an infinite extra dimension 4/ : Gunnar Nordström extended Newton s law of gravity to include special relativity (scalar gravity, before Einstein s tensor GR, 1916). Unification of forces: Nordström then combined his gravity with electromagnetism (1914).
7 The very first extra-dimensional world D.P. George Trapped in an infinite extra dimension 4/ : Gunnar Nordström extended Newton s law of gravity to include special relativity (scalar gravity, before Einstein s tensor GR, 1916). Unification of forces: Nordström then combined his gravity with electromagnetism (1914). 4D electromagnetism becomes 5D: } φ 4D part EM vector potential = A gravity potential } extra dim d Only works if dw φ = d dw A = d dw (...) = 0 we can t move in ED.
8 The very first extra-dimensional world D.P. George Trapped in an infinite extra dimension 4/ : Gunnar Nordström extended Newton s law of gravity to include special relativity (scalar gravity, before Einstein s tensor GR, 1916). Unification of forces: Nordström then combined his gravity with electromagnetism (1914). 4D electromagnetism becomes 5D: } φ 4D part EM vector potential = A gravity potential } extra dim d Only works if dw φ = d dw A = d dw (...) = 0 we can t move in ED. Nordström: It is shown that a unifying treatment of the electromagnetic and gravitational fields is possible if one considers the four dimensional spacetime-world to be a surface in a five dimensional world.
9 Extra dimensions today D.P. George Trapped in an infinite extra dimension 5/11 95 years later implement this idea seriously. We have general relativity and the standard model. How to make sure that particles cannot move in ED?
10 Extra dimensions today D.P. George Trapped in an infinite extra dimension 5/11 95 years later implement this idea seriously. We have general relativity and the standard model. How to make sure that particles cannot move in ED? Use a domain wall as a trap in the extra dimension. DW forms as solution of scalar field (a kink).
11 Quantum mechanical well D.P. George Trapped in an infinite extra dimension 6/11 Domain wall acts like a trap for particles, just like QM well. potential ground state Ψ(x, t) = n=modes f n (x) e ient f n (x) are eigenfunctions of the Hamiltonian.
12 Quantum mechanical well D.P. George Trapped in an infinite extra dimension 6/11 Domain wall acts like a trap for particles, just like QM well. potential ground state Ψ(x, t) = n=modes f n (x) e ient f n (x) are eigenfunctions of the Hamiltonian. Ψ(5D) = n=modes f n are extra-dimensional profiles. Ground state ψ 0 corresponds to our 4D particles. f n (extra dimension) ψ n (4D)
13 Trapping gravity and matter Gravity trapping by volcano potential. (Randall-Sundrum warped metric.) extra dimension Fermion trapping; only left-chiral in ground state. Higgs trapping; ground state has negative mass. effective potential 0 L R effective potential extra dimension extra dimension D.P. George Trapped in an infinite extra dimension 7/11
14 Trapping gauge bosons D.P. George Trapped in an infinite extra dimension 8/11 Superconductor repel magnetic field SU(2) U(1) SU(2) Dual superconductor repel electric field Trap U(1) EM fields with SU(2) bulk. dual superconductor dual superconductor (Dvali-Shifman mechanism.)
15 Grand unification D.P. George Trapped in an infinite extra dimension 9/11 Now need to build the SM. Based on gauge group SU(3) SU(2) U(1). To trap SM gauge fields, bulk needs to contain, and be larger, than SM. Naturally leads to grand unification (GUT models).
16 Grand unification D.P. George Trapped in an infinite extra dimension 9/11 Now need to build the SM. Based on gauge group SU(3) SU(2) U(1). To trap SM gauge fields, bulk needs to contain, and be larger, than SM. Naturally leads to grand unification (GUT models). Simplest choice is SU(5). SM SU(5) bulk SU(5) bulk grand unification + gauge boson trapping
17 Properties of unification Grand unification trapped bosons. Choice of GUT group: SU(5), SO(10), E 6,.... Split fermions and Higgs: matter located at different places along extra dimension. Proton decay suppressed by split fermions. Particle masses depend on overlap with Higgs in extra dimension. e c L u c L q L d c L ll extra dimension D.P. George Trapped in an infinite extra dimension 10/11
18 Summary Infinite extra dimension? domain wall formation trapped particles natural grand unification Realistic, testable model: mass related to location in ED Kaluza-Klein modes at high energies, particles disappear into ED cosmology changed at early time (universe is then 5D) modifications to gravity (very small) Rich framework for future investigation: CKM mixing (overlap integrals) neutrinos add supersymmetry D.P. George Trapped in an infinite extra dimension 11/11
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