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杨振宁回国养老享福?中科院院士:他回国做5项贡献
2017-09-19 17:22:00 中国青年网
当时无法得到实验验证。50年后,这个修正项随着冷原子物理学的发展而得到了实验证实。杨先生自己重新研究这个问题,用赝势方法将稀薄硬球玻色子多体系统从3 维分别推广到2维、4维和5维。
1969年,杨振宁 和他的弟弟杨振平将一维δ函数排斥势中的玻色子问题推进到有限温度。这是历史上首次得到的有相互作用的量子统计模型在有限温度(T >0)下的严格解。基于这个模型的结果也在冷原子系统中得到实验实现和验证,回归后,杨先生将其扩展到一维费米子系统,具有多个分量的粒子系统,推广到各种形式的束缚势,如一维谐波限制(harmonic trap)或其他限制(trap),排斥或有吸引力的δ函数势的作用,等等。这些推广并不是平庸的,有的具有相当难度,也都与冷原子物理研究紧密结合。
杨先生回到清华后,一共写了13篇纯物理研究文章,这些文章中多篇杨先生是唯一的作者,也有一些文章有合作者,一般是一个合作者,主要是马中骐。还有一些合作者帮杨先生做了一些计算,像香港中文大学的Wei B. B.。这说明这些理论研究文章是杨先生亲自研究和推导的,不像现在很多人,从40、50岁开始做老板,已不在科研一线做研究了。
回归后杨先生曾经向《物理评论快报》(PRL)投过一篇稿件,引起很不愉快的经历。第一位审稿人轻率地认为作者是与诺贝尔奖获得者同名的某位C N Yang,审稿极为马虎,似乎也完全忽视文章所研究系统存在受限势;第二位审稿人的意见是许多人常遇到的、无实质性批评内容的所谓“缺乏广泛兴趣”和“缺少新的物理”,加上编辑“明显傲慢自大和官僚化”的程式化答复,使得杨振宁这位PRL的创始人和多篇重要论文的作者,感到整个拒稿过程“funny and troubling”。为此,在杨振宁文集Selected Papers II With Commentaries 的附注中,杨先生原原本本地附上审稿人意见以及他与PRL编辑的两轮通信,力求改变这一错误的趋向[4]。之后,他的科研文章主要投给中国物理学会所属的《中国物理快报》(CPL)上,以实际行动表达了杨先生的价值观念:一项学术成果的价值并不等价于发表刊物的影响因子。作为CPL的主编,我经常可以收到杨先生于晚上11—12点发来的电子邮件,作为一个耄耋之年的科学家,杨先生的干劲与活力实在令人敬佩和惊叹!
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