北航一位名叫Tony Yuan的人在academia.com贴出一篇题为“Exploring the Accelerating Expansion of the Universe”的讨论文章： https://www.academia.edu/s/1a5b08b8da#comment_1355327 我偶尔点进去看到有一人的评论提到那个所谓的证明重力时间膨胀的著名的Shapiro实验，我就跟复的一贴指出时间从来不会膨胀，其中我就引用了本文中提到的爱因斯坦1912年的公式。 当时该讨论显示还有一个月才结束，想必北航人不缺钱。。。所以我还等着那位提到Shapiro实验的人会回复我的跟帖，但隔天，该讨论就结束了。。。 只有两方能提前结束一个讨论：Tony Yuan本人，或academia.com 提前结束的动机可能有两种：1）因为结束后之前没有参与讨论的人好像就不能再进去了，所以提前结束可能是为了不让更多的人看到讨论的内容；2）结束前，参与讨论的人仍可以修改自己的发言，结束后谁也不能再做修改，所以提前结束可能是将已有的发言冻结。 上面两种可能代表着完全相反的态度。前者是害怕更多的人看到已有的讨论，后者是将已有的发言冻结留着给已参与讨论的人及可能的后人看。。。。 你们认为是哪种可能呢？下面是那段对话： H R HARRISON 7 days ago Dear Tony Yuan, My first responce to your paper is related to the mention of the speed of gravity. As shown in my Basics of Post Newtonian Gravity ( found in my profile) I initialy reagrd ti speed of gravity to be the same the speed of light in mass free space.. The first additional term in my equation is based on eletromagnetics and is normal to the relavive velocity. This gives the accepted results on the precession of orbits in the Solar system. But there are a few other measurable effects that are not predicted. Another term is added wich acts in the direction of the relative velocity. The new equation now predictes all the well verified phenomena. The equation now predicts that the speed of light is reduced when passing through a gravity field. The speed of gravity is still constant. I have not found any way to test my ewuation when applied to dynamics outside the Solar system. Also I do not believe that your equations will work for the Solar system. H Ron Harrison Rongqing Dai 7 days ago About the so-called Shapiro delay, delay is the observed fact but the so-called time-dilation is just the tale.... The delay could be most plausibly caused by the longer path when light grazing the Sun, and maybe arguably the slower speed of light as well as your theory claims, but definitely not the dilation of time. Concerning the change of the speed of light in gravitational field, by Newtonian, we could expect that the speed of light would increase when approaching the massive object and decrease when departing the massive object instead of the opposite! Einstein claims in his 1912 article that [A clock will run faster when we bring it to a location where c is greater] which is consistent to the famous GR claim that time runs slower in gravity if the speed of light decreases in gravity as your theory claims.....but Einstein also contradicted this with the following formula in the same 1912 article: m ω^2 R = c^2 k mm’ /4πR^3 (1) where m is the mass of the object circulating another mass m', R is the distance, and ω is the angular velocity of m circulating m'. Now if m is the Earth, m' is the Sun, then ω would be the clock of ancient people around world to count seasons and years! From (1) we can conclude that the closer to a massive object, the faster the clock if the speed of light is constant, which contradicts the famous nowadays GR claim (which assumes a constant speed of light anywhere) that time goes slower in gravity. Of course, now you can say that a decreased speed of light would make (1) not contradict to the famous GR claim......but obviously a linear decrease would not do the job, even quadratically decrease would not be enough since that would only make ω independent of R, not increase with R. The problem is that if the speed of light would decrease faster than quadratically as gravity increases, we should have observed this effect in our earth environment, shouldn't we? |
