Tags » Loop Quantum Gravity

Black holes are 'portals to other universes,' according to new quantum results

Black holes may not end in a crushing singularity as previously thought, but rather open up passageways into whole other universes.

According to Albert Einstein’s theory of general relativity, black holes are uninhabitable chasms of spacetime that end in a “singularity,” or a mass of infinite density. 657 more words


Propagation in the absence of classical spacetime

Written by Madhavan Varadarajan

At the Planck scale of 10−33cm, where the very notion of classical spacetime ceases to exist due to large quantum fluctuations of spacetime geometry, can meaning be given to the notion of “causality”? 864 more words


The possible emptiness of a final theory

Written by Jesper Møller Grimstrup, an independent danish theoretical physicist. He has collaborated with the mathematician Johannes Aastrup for more than a decade developing what they now call quantum holonomy theory. 968 more words


From Ethan Siegel: "Dimensional Reduction: The Key To Physics' Greatest Mystery?"

From Ethan Siegel

Jul 26, 2016
Sabine Hossenfelder

A visualization of a 3-torus model of space, where lines or sheets in series could reproduce a larger-dimensional structure. 1,403 more words

Basic Research

Book review: Covariant Loop Quantum Gravity, an elementary introduction to quantum gravity and spinfoam theory

Review of “Covariant Loop Quantum Gravity, an elementary introduction to quantum gravity and spinfoam theory” by Carlo Rovelli and Francesca Vidotto

One of the central problems of contemporary physics is finding a theory that allows for describing the quantum behavior of the gravitational field. 1,133 more words

Quantum Gravity

Why So Complicated?

From: Danish researchers looking to crowdfund ‘Theory of Everything’

Never to be a jerk about it, but I’m already dissuaded, based upon the annotation under the main post image there… 1,504 more words


Book Review: The Singular Universe and the Reality of Time

Review of “The Singular Universe and the Reality of Time” by Roberto Mangabeira Unger and Lee Smolin

The Singular Universe is effectively two separate books held together by some common ideas. 2,401 more words