Quadratic gravity theory introduces additional transient ghost particles that can travel back in time

came across this today

quantum gravity

Old ‘Ghost’ Theory of Quantum Gravity Makes a Comeback​

By Charlie Wood November 17, 2025 Has the secret to understanding gravity been hiding in plain sight for nearly 50 years?

When physicists first invented quantum field theory and tried to use it to ask questions about electrons and photons, their calculations went infinite because each term in a sum tried to account for a never-ending continuum of ever-smaller ripples. But a sum of infinite terms was no answer at all. ​

​

this trick, known as renormalization, was a way of blurring out the smallest ripples in a field and including only their net effects. In the case of the electromagnetic field, this works because the impact of the small ripples is limited; the smaller the ripples get, the less they influence the larger ripples. ​

Stelle figured out that he could modify Einstein’s equation so that space-time... ​

Read more