Teleparallelism and Quantum Mechanics
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1 Workshop Challenges of New Physics in Space Campos do Jordão, April 2009 Teleparallelism and Quantum Mechanics Raissa F. P. Mendes
2 Gravity is the manifestation of space-time curvature
3 Curvature: R ρ θμν = μ Γ ρ θν ν Γ ρ θμ + Γ ρ σμγ σ θν Γ ρ σνγ σ θμ Torsion: T ρ μν = Γ ρ νμ Γ ρ μν = 0 (GR) Curvature Torsion General Relativity: Γ ρ μν=½ g σρ ( μ g ρν ν g ρμ ρ g μν )
4 Einstein-Cartan Theory Curvature: R ρ θμν = μ Γ ρ θν ν Γ ρ θμ + Γ ρ σμγ σ θν Γ ρ σνγ σ θμ Source: Energy and Momentum Torsion: T ρ μν = Γ ρ νμ Γ ρ μν Source: Spin New Physics!
5 Teleparallelism or Teleparallel Equivalent of General Relativity Curvature: R ρ θμν = μ Γ ρ θν ν Γ ρ θμ + Γ ρ σμγ σ θν Γ ρ σνγ σ θμ Torsion: T ρ μν = Γ ρ νμ Γ ρ μν = 0 (TEGR) Torsion in TEGR is associated with the same degrees of freedom as curvature in GR Alternative and Equivalent Theory
6 Foundations of Teleparallelism Tetrad field g=g μν dx μ dx ν h a = h aμ μ η=η ab dx a dx b η ab = g μν h a μ h b ν Physical meaning: The tetrad field establishes a class of observers
7 Foundations of Teleparallelism - Gauge theory for the translation group T(4) Energy and momentum, the sources of gravity, are conserved if the physical system is invariant under translations in space-time (Noether s Theorem) - Fundamental field: gauge potential B μ = B a μ P a (P a = a, the generators of infinitesimal translations) - Gauge potential as the non-trivial part of the tetrad field: h a μ = μ x a + B a μ Gravity Inertial effects
8 Foundations of Teleparallelism - Torsion tensor: T a μν = μ h a ν ν h a μ = μ B a ν ν B a μ Field strength of the theory Weitzenböck connection: Γ ρ μν = h aρ μ h a ν R ρ θμν=0 - Lagrangian density: L= h/2k² (T ρ μνt ρ μν + 1/4 T ρ μνt νμ ρ 1/2T ρμρ T νμ ν ) = ½ k -2 ( g) ½ R μ (2h k -2 T νμ ν) h = det(h a μ) = ( g) ½ and k = 8πG/c 4.
9 Teleparallelism and Quantum Mechanics Hamiltonian Formulation of TEGR Starting point for quantization iħ { } [ ] iħċ = [C,H] - Hamiltonian density: h a μ and Π aμ = δl/δh aμ L = h aμ Π aμ H Lagrange multipliers J. W. Maluf, J. F. R. Neto, 2001 H = h a0 C a + α ik Χ ik + β k Χ k 0 First class constraints Non-polynomial dependency on the canonical variables
10 Teleparallelism and Quantum Mechanics Uncertainty Principle (non-locality) QM Equivalence Principle (local equivalence of gravity and inertia) GR
11 Teleparallelism and Quantum Mechanics - Gravity and Universality Weak Equivalence Principle: m g = m i No mass-dependency in the equations
12 Teleparallelism and Quantum Mechanics - COW experiment R. Colella, A. W. Overhauser and S. A. Werner, 1974 Mass-dependency Teleparallelism suitable description not dependent on EP R. Aldrovandi, J. G. Pereira, K. H. Vu, 2005
13 Teleparallelism and Quantum Mechanics - Equation of motion particle of mass m in a gravitational field du a /ds = T b acu b u c - If m g m i P μ ν ( μ x a + α B a μ) du a /ds = αt a νμu a u μ (P μ ν = δ μ ν u μ u ν and α = m g /m i ) Solvable for the gauge potential - Correspondent relativistic equation: du μ /ds ω λ μνu λ u ν = (m g m i )/m g P ν μ ν x a du a /ds Deviation of geodesic motion
14 Comments and conclusions - GR and TEGR are alternative and empirically equivalent geometrical formulations for describing Gravity, in which curvature, in one side, and torsion, in the other, plays the fundamental role. - TEGR can be formulated as a gauge-like theory for T(4). - The Hamiltonian formulation of Teleparallelism can be carried out, but technical and conceptual difficulties for the construction of the quantum theory remain here, as in GR. - Conceptually, the TEGR may have some advantages over GR, since its interpretation does not depend no strongly on the Equivalence Principle and on the Universality of Gravity.
15 Comments and conclusions - What is the role of torsion in the description of Gravity? - Unnecessary geometrical entity? (GR) - Necessary to describe the spin interaction with the gravitational field (relevant to small scale gravitational phenomena)? (EC) - Associated with the same degrees of freedom of curvature in the description of Gravity? (TEGR) - Other?...
16 More References... [1] R. Aldrovandi e J. G. Pereira, An introduction to Teleparallel Gravity. [2] H. I. Arcos, V. C. Andrade, J. G. Pereira, Torsion and Gravitation: A New View, International Journal of Modern Physics D, Cingapura, v. 13, n. 5, p , [3] J. W. Maluf, J. F. da Rocha Neto, Phys. Rev. D64, (2001). [4] J. W. Maluf, S. C. Ulhoa, F. F. Faria, The Pound-Rebka experiment and torsion in the Schwarzschild spacetime [arxiv: v1]
17
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