We propose a new picture of nature in which there are only two fundamental universal constantsè ē (≡e/c) andh(≡ħ/c). Our theory is developed within the framework of a new four-dimensional symmetry which is constructed on the basis of the Poincaré-Einstein principle of relativity for the laws of physics and the Newtonian concept of time. We obtain a new space-light transformation law, a velocity-addition law, and so on. In this symmetry scheme, the speed of light is constant and is completely relative. (...) The new theory is logically self-consistent, and it moreover is in agreement with all previously established experimental facts, such as the “lifetime dilatation” of unstable particles, the Michelson-Morley experiment, etc. There is a difference relative to the usual theory, though, in that our theory predicts a new law for the Dopplerfrequency shift, which can be tested experimentally by measuring the second-order frequency shift. (shrink)

It has been widely held that presentism cannot easily accommodate Einstein’s Special Theory of Relativity account of the relativity of simultaneity because presentism privileges successively unique times ontologically. Recently Brogaard and Marlow argued that presentism does not deserve the attribution of this defect because it may well be that Einstein’s account of the relativity of simultaneity is defective, leaving it open to establishing a view of absolutist simultaneity friendlier to presentism. Specifically Brogaard and Marlow present an argument against one of (...) Einstein’s most famous accounts of the relativity of simultaneity, and moreover raise doubts about whether Einstein availed himself of absolutist frames in some of his explanations of relativity. I will dismiss both of these charges, and thus argue that the complaint against presentism from SR stands. (shrink)