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  "path": "/threads/quadratic-gravity-theory-introduces-additional-transient-ghost-particles-that-can-travel-back-in-time.2634581/",
  "publishedAt": "2026-05-06T05:23:28.000Z",
  "site": "https://forums.anandtech.com",
  "tags": [
    "OT Discussion Club",
    "quantum gravity",
    "Charlie Wood",
    "renormalization",
    "Read more"
  ],
  "textContent": "came across this today\n\nquantum gravity\n\n\n### Old ‘Ghost’ Theory of Quantum Gravity Makes a Comeback​\n\n _By_ Charlie Wood\n_November 17, 2025\nHas the secret to understanding gravity been hiding in plain sight for nearly 50 years?_\n\n\n\n_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._ ​\n\n​\n\n _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._ ​\n\n _Stelle figured out that he could modify Einstein’s equation so that space-time..._ ​\n\n\nRead more",
  "title": "Quadratic gravity theory introduces additional transient ghost particles that can travel back in time"
}