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Particle decays and stability on the de Sitter universe

机译:de Sitter宇宙上的粒子衰减和稳定性

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We study particle decay in de Sitter space-time as given by first-order perturbation theory in a Lagrangian interacting quantum field theory. We study in detail the adiabatic limit of the perturbative amplitude and compute the "phase space" coefficient exactly in the case of two equal particles produced in the disintegration. We show that for fields with masses above a critical mass m_c there is no such thing as particle stability, so that decays forbidden in flat space-time do occur here. The lifetime of such a particle also turns out to be independent of its velocity when that lifetime is comparable with de Sitter radius. Particles with mass lower than critical have a completely different behavior: the masses of their decay products must obey quantification rules, and their lifetime is zero.
机译:我们研究了拉格朗日相互作用量子场理论中一阶扰动理论给出的de Sitter时空中的粒子衰减。我们详细研究了摄动振幅的绝热极限,并精确计算了在崩解中产生两个相等粒子的情况下的“相空间”系数。我们表明,对于质量高于临界质量m_c的场,不存在诸如粒子稳定性之类的东西,因此,在平坦的时空中确实会发生衰变。当该粒子的寿命与de Sitter半径相当时,其寿命也与速度无关。质量低于临界值的粒子具有完全不同的行为:其衰变产物的质量必须服从量化规则,其寿命为零。

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