Cosmologic philosophy: Einstein theory proven again (Introduction)

by David Turell , Sunday, January 03, 2021, 23:14 (1206 days ago) @ David Turell

Spacetime dragging by a pulsar:

https://www.sciencenews.org/article/wobbling-orbit-pulsar-proves-einstein-right-again-r...

"A twist in the fabric of spacetime — predicted by the physicist’s theory of general relativity — is causing the orbit of one stellar corpse to teeter around another stellar corpse, researchers report. And the relativistic corkscrew is helping astronomers reconstruct the final days of these two long-dead stars.

"According to general relativity, any spinning mass drags spacetime around with it, like a hand mixer in molasses. One way to see this “frame dragging” is to keep a careful eye on anything circling the spinning object on a tilted orbit — the spacetime maelstrom will make the orbit wobble, or precess.

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"Over those two decades, the orbit of the pulsar has been slowly precessing, astronomers report. The precession isn’t much — the orbit’s tilt drifts by just 0.0004 degrees per year. But it matches what researchers expect if the neighboring white dwarf whips up spacetime as it spins. Vivek Venkatraman Krishnan, an astrophysicist at the Max Planck Institute for Radio Astronomy in Bonn, Germany, and colleagues report the results in the Jan. 31 Science.

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"The pulsar precession helps researchers piece together the final moments in the lives of both stars. Relativistic wobbling occurs only if the orbit of the pulsar and the spin of the white dwarf are misaligned, something which is usually smoothed over by an exchange of mass between the dying stars. “This immediately tells us that the orbit was tilted due to the supernova explosion that produced the pulsar,” Venkatraman Krishnan says.

"Normally, the supernova would go off and then the progenitor of the white dwarf would dump gas on the pulsar after the explosion, aligning spin to orbit. But in this case, the opposite happened: The pulsar’s progenitor dumped gas on the white dwarf and then the supernova occurred."

Comment: It is high time to accept Einstein is never wrong.