离未来突然出现的压力奇点还有多远？
How far is it to a sudden future singularity of pressure?
摘要：
我们讨论的约束来自当前的观测Ia型超新星的宇宙学模型，允许突然未来的压力奇点（与比例因子和能量密度经常）。我们表明，这样一个突然的奇点可能会发生在不久的将来（例如在一千万年内），它的预测在宇宙演化的当前时刻不能区分，与当前的观测数据，从未来演化的标准精髓场景给出的预测。幸运的是，突然的未来奇点的特征只是无限潮汐力的瞬间峰值;没有测地线不完全性，这意味着宇宙的演化最终可能会继续下去，直到另一个“更严重”的奇点，如大挤压或大撕裂。
英文摘要：
We discuss the constraints coming from current observations of type Ia supernovae on cosmological models which allow sudden future singularities of pressure (with the scale factor and the energy density regular). We show that such a sudden singularity may happen in the very near future (e.g. within ten million years) and its prediction at the present moment of cosmic evolution cannot be distinguished, with current observational data, from the prediction given by the standard quintessence scenario of future evolution. Fortunately, sudden future singularities are characterized by a momentary peak of infinite tidal forces only; there is no geodesic incompletness which means that the evolution of the universe may eventually be continued throughout until another ``more serious'' singularity such as Big-Crunch or Big-Rip.
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