The best-known attempt is doubly special relativity, which posits that the Planck length is also the same in all reference frames, and is associated with the work of Giovanni Amelino-Camelia and João Magueijo.
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The speed of light is a dimensional quantity and so, as has been emphasized in this context by João Magueijo, it cannot be measured.
In 2009, he published A Brilliant Darkness, an account of the life and science of vanished physicist Ettore Majorana.
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In 1998, Magueijo teamed with Andreas Albrecht to work on the varying speed of light (VSL) theory of cosmology, which proposes that the speed of light was much higher in the early universe, of 60 orders of magnitude faster than its present value.
João Gilberto | João Pessoa | João Bosco | Maria João | João Roque | Maria Joao | João Goulart | João Cabral de Melo Neto | São João River | São João de Meriti | João Vieira Pinto | João Sousa | Joao Roque | João Pinto | João Magueijo | João Havelange | João Botelho | Maria João Rodrigues | João Saldanha | João Reis | João Paulo de Oliveira | João N'Tyamba | João Maria Ferreira do Amaral II | João Gordo | João Gonçalves Filho | João de Deus | João de Castro | João Batista Vilanova Artigas | Cemitério São João Batista | Alberto João Jardim |