New research suggests that the very structure of space-time may be an emergent phenomenon, arising from the entanglement of quantum information. This challenges our fundamental understanding of gravity and the universe.
An article exploring the revival of quadratic gravity, a 1977 theory initially dismissed for its negative-energy "ghost" particles, which physicists now believe may be manageable and even offer insights into quantum gravity and cosmic inflation.
Quadratic gravity is renormalizable, meaning it avoids infinities that plague other quantum gravity theories, and it offers new predictions and insights into cosmic inflation and the nature of space-time. Researchers are exploring modifications to quantum field theory rules to accommodate these ghost particles without violating fundamental principles like unitarity and causality. The theory is gaining renewed interest as alternative approaches like string theory falter, and it may offer a path toward understanding gravity at a quantum level.
Quadratic gravity is renormalizable, meaning it avoids infinities that plague other quantum gravity theories, and it offers new predictions and insights into cosmic inflation and the nature of space-time. Researchers are exploring modifications to quantum field theory rules to accommodate these ghost particles without violating fundamental principles like unitarity and causality. The theory is gaining renewed interest as alternative approaches like string theory falter, and it may offer a path toward understanding gravity at a quantum level.
A recent study proposes that the universe functions as a vast quantum gravity computer, processing information at the Planck scale at an incredible rate, potentially influencing how physicists view cosmic interactions and energy conservation.
This article presents a white paper summarizing current knowledge on quantum gravity phenomenology and its multi-messenger signals. It provides an overview of the field, discusses experimental and observational signatures, and identifies key questions and challenges.
