Born in 1911, Olivier Costa de Beauregard gravitated towards theoretical physics. He became one of the collaborators of Nobel Laureate Louis de Broglie, the progenitor of wave mechanics.
However, Costa de Beauregard always nurtured a great intellectual freedom. Confronted with the peculiarities of quantum mechanics (which seemed to impose 'magical' instantaneous communications at a distance between particles), he rejected dogmas and sought a solution respecting Einstein's theory of Relativity.
By proposing that information could travel to the past (retrocausality), he collided head-on with the orthodox scientific community of his time. His connections with parapsychology and his desire to integrate 'consciousness' into the equations of physics often relegated him to the margins of dominant academic recognition.
Today, with advances in quantum entanglement and new reflections on the arrow of time, his pioneering works are widely rehabilitated and studied.
He proposed the most elegant explanation of the EPR paradox: information between two entangled particles does not travel instantaneously through space, but journeys to the past (along the light cone) to their common origin, before ascending through time to the other particle. This is the renowned spatio-temporal 'zigzag.'
This is his major contribution. Since the fundamental equations of physics are time-symmetric (they function equally well forwards and backwards), Costa de Beauregard argues that nature does not prohibit inverse causality.
In our macroscopic world, thermodynamics dictates that cause precedes effect. But at the fundamental quantum level, an advanced wave can travel from the future to the present. Thus, the future actively participates in shaping the current state of the universe.
If the future can influence the past, how does this manifest for us? Costa de Beauregard hypothesized that the human mind (the psyche) functions as a 'well' or magnet for these retrocausal waves.
Synchronistic events (those impossible coincidences that respond to our thoughts) would literally be information or influences sent from our own future, which our consciousness captures in the present. Quantum physics here offers a rational framework to explain the phenomena described by Carl Jung.
His principal essay where he poetically popularizes the idea of a universe where the arrow of time is but a statistical illusion and where the future reacts upon the past.
A more academic work exploring in depth the temporal symmetry and the relativistic foundations of the universe.