It seems that many physicists still don't know that Einstein's relativity is logically wrong and can be easily disproved through Lorentz Transformation of clock time i.e. our physical time between two inertial reference frames:
Let's look at the twin paradox which is designed to demonstrate that relative speed would generate time dilation as predicted by special relativity which claims that when the speed of a clock relative to an observer was close to the speed of light, the observer would see the clock slow down close to stop. But, it is pretty ironic as shown on Wikipedia, the final conclusion of the twin paradox becomes that, after a high speed space travel, it is the acceleration of the traveling twin (not his speed relative to his twin brother) that made him younger than his twin brother staying on the earth because both twins had experienced exactly the same speed relative to each other during the entire trip. Is it funny that the original argument that relative speed generates time dilation is completely lost, although relativists still think that the paradox has been solved? In fact, this paradox has simply confirmed that relative speed can never generate time dilation and special relativity is wrong.
Actually Einstein's relativity has already been disproved both theoretically and experimentally for more than four years. The fatal mistake of Einstein's relativity is that it uses Lorentz Transformation to redefine time and space, and the newly defined time is no longer the physical time we measure with physical clocks. The claim of the constant speed of light is very similar to the claim that everybody had the same height if the height is measured with a new ruler - an elastic band a ruler. Obviously, such claims do not make any sense.
In a physics theory, the physical time shown on a physical clock is T = tf/k where t is the theoretical time, f is the frequency of the clock and k is a reference frame independent calibration constant.
In Newton's mechanics, the absolute Galilean time makes frequency f a reference frame independent constant. Therefore, we can set k = f to make the clock show the theoretical time i.e. the absolute Galilean time t: T = tf/k = tf/f = t.
But in special relativity, the relative relativistic time makes frequency f a reference frame dependent variable and can't be eliminated by setting k = f in the clock formula. Thus, clock time can't be simply calculated by the formula: T = tf/k != t in special relativity. Therefore, we need to verify whether clock time T and relativistic time t have the same property in Lorentz Transformation.
When a clock is observed in another inertial reference frame, we have t' = rt and f' = f/r and T' = t'f'/k = rt(f/r)/k = tf/k = T, where r = 1/sqrt(1 - v^2/c^2), which means that the physical time T won't change with the change of the inertial reference frame, and is Lorentz invariant and absolute, completely different from relativistic time. That is, a clock still measures the absolute time in special relativity.
Some people may argue that relativistic time has to be shown on two clocks. OK, here is it.
If you have a clock (clock 1) with you and watch my clock (clock 2) in motion and both clocks are set to be synchronized to show the same physical time T relative to your inertial reference frame, you will see your clock time: T1 = tf1/k1 = T and my clock time: T2 = tf2/k2 = T, where t is relativistic time of your frame, f1 and f2 are the frequencies of clock 1 and clock 2 respectively observed in your inertial reference frame, k1 and k2 are calibration constants of the clocks. The two events:
(Clock1, T1=T, x1=0, y1=0, z1=0, t1=t)
and
(Clock2, T2=T, x2=vt, y2=0, z2=0, t2=t)
are simultaneous measured with both relativistic time t and clock time T in your reference frame. When these two clocks are observed by me in the moving inertial reference frame, according to special relativity, we can use Lorentz Transformation to get the events in my frame (x', y', z', t'):
(clock1, T1', x1'=-vt1', y1'=0, z1'=0, t1')
and
(clock2, T2', x2'=0, y2'=0, z2'=0, t2')
where
t1' = r(t1-vx1/c^2) = r(t-0) = rt
t2' = r(t2-vx2/c^2) = r(t-tv^2/c^2) = rt/r^2 = t/r
T1' = t1'f1'/k1 = (rt)(f1/r)/k1 = tf1/k1 = T1 = T
T2' = t2'f2'/k2 = (t/r)(rf2)/k2 = tf2/k2 = T2 = T
in which r = 1/sqrt(1-v^2/c^2).
That is, no matter observed from which inertial reference frame, the two events are still simultaneous measured with physical time T i.e. the two clocks are always synchronized measured with clock time T i.e. clock time T is absolute, but not synchronized measured with relativistic time t'. In real observations, we can only see clock time T but not relativistic time. Therefore, clock time is our physical time and absolute, totally different from relativistic time in Lorentz Transformation and thus relativistic time is a fake time without physical meaning. The change of the reference frame only makes changes of the relativistic time from t to t' and the relativistic frequency from f to f', which cancel each other in the formula: T= tf/k to make the physical time T unchanged. This proves that even in special relativity our physical time is still absolute. Therefore, special relativity based on the fake relativistic time is wrong.
That the physical time (i.e. clock time) is absolute has been clearly confirmed by the physical fact that all the atomic clocks on the GPS satellites are synchronized not only relative to the ground clocks but also relative to each other to show the same absolute physical time, which directly denies the claim of special relativity that clocks can never be synchronized relative to more than one inertial reference frame no matter how you correct them because "time is relative".
You will find the mathematical proofs that in special relativity, the real speed of light still follows Newton's velocity addition law, and both time dilation and length contraction are simply illusions in my peer-reviewed journal paper and conference paper which are available free of charge at:
https://www.researchgate.net/publication/297527784_Challenge_to_the_Special_Theory_of_Relativity and
https://www.researchgate.net/publication/297528348_Clock_Time_Is_Absolute_and_Universal