# Basic Relativity: An Introductory Essay by Péter Hraskó

By Péter Hraskó

This short provides a brand new approach of introducing relativity conception, within which difficult relativistic results corresponding to time dilation and Lorentz contraction are defined ahead of the dialogue of Lorentz-transformation. The thought of relativistic mass is proven to contradict the spirit of relativity thought and the genuine importance of the mass-energy relation is contrasted with the preferred view of it. the writer discusses the dual paradox from the viewpoint of either siblings. final yet no longer least, the basics of basic relativity are defined, together with the new Gravity Probe B experiment.

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5 the boxes play the role of bodies whose internal energy may be manipulated by means of devices within them and whose mass is measured by the stretch of the spring they are hooked upon. 13 The mass of the latter box is, therefore, greater than that of the former by an amount K=c2 , where K is the kinetic energy of the particles. So the difference in the weights of the boxes is equal to ! 2Mc2 2 ð1:10:2Þ g pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ À 2Mc 1 À v2 =c2 where v is the velocity of the particles. This difference is compensated for by the weight placed at the top of the left box.

This is the reason why t3 turns out smaller than t1. The coordinate time t is obviously identical to the proper time of the cannon C, resting in the origin of K, and so the moments t1 and t3 are independent of the coordinate system chosen. 4), in this domain t3 \t2 : Since vk [ c2/V it is true a fortiori in the domain v [ vk. 48 2 The Lorentz-Transformation (a) (b) Fig. 5 Illustration of the causality paradox As we see, superluminal signals are a potential source of the causality paradox. The paradox itself consists in reversal of the time order within a causally related timelike pair of events (E1 and E3 in the example).

4 correspond to motion of I 0 with positive velocity (V [ 0; b [ 0). In the opposite case (V \0; b\0) the time axis is rotated in counterclockwise, the x-axis in clockwise direction. The primed axes Fig. 6 Spacetime Diagrams 45 Fig. 4 Representation of Lorentz-transformation on the Minkowski diagram will then make an obtuse angle with each other. Since primed and unprimed frames are equivalent, rectilinear coordinates are by no means distinguished with respect to the oblique ones. If, for example, the primed coordinates are taken in the vertical and horizontal direction then the unprimed coordinates will make an obtuse angle between them.