最近发表了一篇关于双生子佯谬的论文，其内容摘要如下：

        双生子“悖论”的核心是双生子运动对称性的疑难，即双生子的对称性是如何被打破的。有的作者将年龄老化差异的原因归结为加速度，也有人认为加速度不应该是年龄老化差异的源，而参照系的切换才是。 到目前为止，在这个问题上还没有达成一致。 实际上，加速度和参照系切换都不应被视为老化差异的根源。 作者提出了一个思想实验，其中两艘非常长的航天飞船以接近光速的速度向相反方向移动，来讨论老化差异的真正原因。 作者发现，造成双生子“悖论”中老化差异的真正原因是目的地选择的不对称性。 人们总是在宇宙中而不是在宇宙飞船中选择他们的目的地。 从这个意义上说，我们的宇宙中有一个优越的参考系。

Abstract

Physicists have employed various approaches to solve the “paradox” and offered a consistent conclusion that the traveller twin is younger than the homebody twin. However, some authors attribute the cause of differential aging to acceleration, while others believe that acceleration should not be regarded as the source of differential aging, but frame switch is. So far there is no agreement on this issue. Actually, acceleration and frame switch should not be regarded as the source of differential aging. The author will introduce a thought experiment in which two very long spacecraft are moving in opposite directions at a speed close to the speed of light to discuss the real cause of differential aging. The author found that the real cause of differential aging in the twin “paradox” is because of the asymmetry of destination choice. People always choose their destinations in the universe rather than in spacecraft. The destinations are always stationary relative to the homebody twin and moving relative to the traveller twin. Once we choose a destination in a reference frame, the distance is the proper length in this reference frame, but the distance will contract in another moving reference frame, thus the recording time will be shorter.

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