Theoretical Question 3: Quantum effects of gravity
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1 36th International Physics Olympiad Salamanca, Spain 3 12 July 2005 ooo Theoretical Question 3: Quantum effects of gravity
2 tennis balls Th.Q. 3: Quantum effects of gravity. Classical description
3 tennis balls Classically, the cavity behaves as a vertical velocity selector Th.Q. 3: Quantum effects of gravity. Classical description
4 tennis balls Classically, the cavity behaves as a vertical velocity selector 1. Balls with high v z will eventually hit the absorber: v z (z) < v max (z) (energy conservation) Th.Q. 3: Quantum effects of gravity. Classical description
5 tennis balls Classically, the cavity behaves as a vertical velocity selector 1. Balls with high v z will eventually hit the absorber: v z (z) < v max (z) (energy conservation) 2. One up-down cycle is necessary in order to select velocities minimum time and length t c, L c Th.Q. 3: Quantum effects of gravity. Classical description
6 tennis balls Classically, the cavity behaves as a vertical velocity selector 1. Balls with high v z will eventually hit the absorber: v z (z) < v max (z) (energy conservation) 2. One up-down cycle is necessary in order to select velocities minimum time and length t c, L c 3. Number of balls at D: N c 0 dz 2v max (z) Th.Q. 3: Quantum effects of gravity. Classical description
7 tennis balls Classically, the cavity behaves as a vertical velocity selector 1. Balls with high v z will eventually hit the absorber: v z (z) < v max (z) (energy conservation) 2. One up-down cycle is necessary in order to select velocities minimum time and length t c, L c 3. Number of balls at D: N c 0 dz 2v max (z) Th.Q. 3: Quantum effects of gravity. Classical description
8 neutrons For neutrons (mv z h), the cavity behaves as an energy selector 1. Balls with high v z will eventually hit the absorber: v z (z) < v max (z) (energy conservation) 2. One up-down cycle is necessary in order to select velocities minimum time and length t c, L c 3. Number of balls at D: N c 0 dz 2v max (z) Th.Q. 3: Quantum effects of gravity. Classical Quantum description
9 neutrons For neutrons (mv z h), the cavity behaves as an energy selector 1. Energy levels E n = E 1 n 2/3 (BS quantization rule PROVIDED) 2. One up-down cycle is necessary in order to select velocities minimum time and length t c, L c 3. Number of balls at D: N c 0 dz 2v max (z) Th.Q. 3: Quantum effects of gravity. Classical Quantum description
10 neutrons For neutrons (mv z h), the cavity behaves as an energy selector 1. Energy levels E n = E 1 n 2/3 (BS quantization rule provided) 2. Time necessary to observe the first quantum level (Uncertainty relations: t h/ E h/e 1 ) 3. Number of balls at D: N c 0 dz 2v max (z) Th.Q. 3: Quantum effects of gravity. Classical Quantum description
11 neutrons For neutrons (mv z h), the cavity behaves as an energy selector 1. Energy levels E n = E 1 n 2/3 (BS quantization rule PROVIDED) 2. Time necessary to observe the first quantum level (Uncertainty relations: t h/ E h/e 1 ) 3. Number of neutrons at D: N q = 0 dz I(z) (intensity proportional to (amplitude) 2 ) Th.Q. 3: Quantum effects of gravity. Quantum description
12 Sketch of experimental data for neutron counting: N eight of the absorber Only the first quantum sharp increase is analysed Th.Q. 3: Quantum effects of gravity.
13 Sketch of experimental data for neutron counting: N eight of the absorber Only the first quantum sharp increase is analysed Th.Q. 3: Quantum effects of gravity.
14 Sketch of experimental data for neutron counting: N eight of the absorber Only the first quantum sharp increase is analysed Th.Q. 3: Quantum effects of gravity.
15 Objective: Compare classical and quantum predictions for neutrons in the Earth s gravitational field Main references: V. V. Nesvizhevsky et al., (Measurement of) quantum states of neutrons in the Earth s gravitational field, Nature 415 (2002) 297; Phys. Rev. D67 (2003) Th.Q. 3: Quantum effects of gravity.
16 Precedent: Electron interference 5th Iberoamerican Physics Olympiad, Jaca 2000, Spain 24th International Physics Olympiad, Williamsburgh 1993, U.S.A. Th.Q. 3: Quantum effects of gravity.
17 Concepts involved: Energy conservation eisenberg s uncertainty relations Energy levels of quantum systems Waves: intensity proportional to (amplitude) 2 Th.Q. 3: Quantum effects of gravity.
18 36th International Physics Olympiad Salamanca, Spain 3 12 July 2005 ooo Theoretical Question 3: Quantum effects of gravity
~ Preamble
Vijay A Singh,Praveen Pathak and K Krishna Chaitanya* Homi Bhabha Centre For Science Education (TIFRI, V N Purav Marg, Mankhurd Mumbai400088, India. * Physics Department Indian Institute of Technology
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