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Emerging Hawking-Like Radiation from Gravitational Bremsstrahlung Beyond the Planck Scale
Marcello Ciafaloni1, Dimitri Colferai1, Gabriele Veneziano2
1Dipartimento di Fisica, Università di Firenze and INFN, Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy.
Physical Review Letters
|November 10, 2015
Summary
Graviton bremsstrahlung in high-energy gravitational scattering produces sub-Planckian energies, similar to Hawking radiation. This spin-2 particle
Area of Science:
- Theoretical physics
- Quantum gravity
- High-energy physics
Background:
- Gravitational scattering at trans-Planckian energies is poorly understood.
- The graviton's spin-2 nature is crucial for its interactions.
Purpose of the Study:
- To analyze graviton bremsstrahlung in high-energy gravitational scattering.
- To connect quantum effects to observable scattering phenomena.
Main Methods:
- Analysis of graviton bremsstrahlung using helicity-transformation phases.
- Investigating scattering at small deflection angles and trans-Planckian energies (E≫M(P)).
Main Results:
- Bremsstrahlung spectrum exhibits deeply sub-Planckian energies (M(P)^2/E).
- Observed suppressed fragmentation region and reduced rapidity plateau.
- Results align with classical scattering estimates.
Conclusions:
- The spin-2 nature of gravitons dictates bremsstrahlung characteristics.
- Sub-Planckian energy production in scattering is a key prediction.
- This work bridges quantum and classical descriptions of gravity.
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