(Roughly) Daily

“Black holes are the seductive dragons of the universe”*…

 

Just when the confirmation of gravity waves seemed conclusively to affirm Einstein’s theory of general relativity…

If you thought regular black holes were about as weird and mysterious as space gets, think again, because for the first time, physicists have successfully simulated what would happen to black holes in a five-dimensional world, and the way they behave could threaten our fundamental understanding of how the Universe works.

The simulation has suggested that if our Universe is made up of five or more dimensions – something that scientists have struggled to confirm or disprove – Einstein’s general theory of relativity, the foundation of modern physics, would be wrong. In other words, five-dimensional black holes would contain gravity so intense, the laws of physics as we know them would fall apart…

“If naked singularities exist, general relativity breaks down,” said one of the team, Saran Tunyasuvunakool. “And if general relativity breaks down, it would throw everything upside down, because it would no longer have any predictive power – it could no longer be considered as a standalone theory to explain the Universe.”

If our Universe only has four dimensions, everything is cool, and ring-shaped black holes and naked singularity are not a thing. But physicists have proposed that our Universe could be made up of as many as 11 dimensions. The problem is that because humans can only perceive three, the only way we can possibly confirm the existence of more dimensions is through high-energy experiments such as the Large Hadron Collider…

More at “A five-dimensional black hole could ‘break’ general relativity, say physicists.”

 * Robert Coover, A Child Again

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As we marvel at models, we might send very carefully-crafted birthday greetings to Jacques de Vaucanson; he was born on this date in 1709.  A mechanical genius, de Vaucanson invented a number of machine tools still in use (e.g., the slide rest lathe) and created the first automated loom (the inspiration for Jacquard).  But he is better remembered as the creator of extraordinary automata.  Among his most famous creations:  The Flute Player (with hands gloved in skin) and The Tambourine Player, life-sized mechanical figures that played their instruments impressively.  But his masterpiece was The Digesting Duck; remarkably complex (it had 400 moving parts in each wing alone), it could flap its wings, drink water, eat grain– and defecate.

Sans…le canard de Vaucanson vous n’auriez rien qui fit ressouvenir de la gloire de la France.  (Without…the duck of Vaucanson, you will have nothing to remind you of the glory of France)

– Voltaire

 source

Written by LW

February 24, 2016 at 1:01 am

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