Lin, Yu-Hsiang 林裕翔



Home Institution

Physics Department, National Taiwan University




R821, Astro-Math Bldg.




+886 932 128368


The Center for Theoretical Sciences, National Taiwan University, Theory Award, 2012.

Selected Publications

[1] Yu-Hsiang Lin, Ab initio investigation on the infrared cuto of the primordial power spectrum, Master thesis, National Taiwan University (2011).
[2] Mariam Bouhmadi-López, Pisin Chen, Yu-Chien Huang, and Yu-Hsiang Lin, Slow-roll inflation preceded by a topological defect phase à la Chaplygin gas, Phys. Rev. D 87, 103513 (2013).


I would love to share with you some words, which I find perfectly describe the way I like physics. It’s from Richard Feynman in a letter to Barbara Kyle on October 20, 1965, collected in the book “Perfectly Reasonable Deviations from the Beaten Track.”


Thinking I understand geometry and wanting to cut a piece of wood to fit the diagonal of a five foot square, I try to figure out how long it must be. Not being very expert, I get infinity – useless – nor does it help to say it may be zero because they are both circles. It is not philosophy we are after, but the behavior of real things. So in despair, I measure it directly – lo, it is near to seven feet – neither infinity nor zero. So we have measured these things for which our theory gives such absurd answers. We seek a better theory or understanding that will give us numbers close to what we measure. We are seeking the formula that gives the square root of fifty.

[End of quote]

Although I had not read these words when I was thirteen or something, they do describe rightly what I felt at some first moments when I encountered physics and mathematics. It is the surprising fact that there ARE actually some ways to find the square root of fifty, and that once you find the way you are immediately able to address on many other phenomena of the world, from the area of a triangle to the distance between the two opposite corners of the room, that impressed me. There are some hidden rules behind the world. Through the key, you see a world that other people may have never seen.