Brush­ing up

Focus-Science and Technology - - Innovations -

I was fas­ci­nated by your ar­ti­cle about the work of Prof Richard Muller on the ori­gins of time (May, p38). I like the idea that time is made as a se­ries of ‘nows’, as space-time ex­pands fol­low­ing the Big Bang. With new space, new time has to also come into be­ing. It oc­curred to me, though, that there might not be any rea­son for each new ‘now’ to be the same size as the last one.

This would have a bear­ing on the cur­rent work on dark en­ergy and the ap­par­ent ac­cel­er­a­tion of the ex­pan­sion of the Uni­verse. If, as space ex­panded, the suc­ces­sive ‘nows’ were ac­tu­ally be­com­ing very slightly smaller over aeons, then the ex­pan­sion of the Uni­verse might not ac­tu­ally be speed­ing up, but only ap­pear to be. Ob­jects mov­ing at a steady speed through suc­ces­sively smaller chunks of time would ap­pear to be ac­cel­er­at­ing.

Do we need dark en­ergy to ex­plain this, or could it just be an arte­fact of the cre­ation of time it­self? Tim Cur­thew-San­ders, Lon­don

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