Search results
Results from the WOW.Com Content Network
Loop quantum gravity (LQG) is a tentative theory of quantum gravity that attempts to unify both general relativity and key quantum mechanics. The areas of research, which involve about 30 research groups worldwide, [1] share the basic physical assumptions and the mathematical description of quantum space.
Quantum mechanics tells us that the forces of nature come in discrete, tiny chunks. Gravity, the bending of space-time, is a force. So is space-time quantized as well?
In loop quantum gravity, or LQG, space-time is a network. The smooth background of Einstein’s theory of gravity is replaced by nodes and links to which quantum properties are assigned. In this way, space is built up of discrete chunks.
Loop quantum gravity (LQG) is a leading approach toward this goal. At its heart is the central lesson of GR: Gravity is a manifestation of spacetime geometry. Thus, the approach emphasizes the quantum nature of geometry and focuses on its implications in extreme regimes -- near the big bang and inside black holes -- where Einstein's smooth ...
Loop Quantum Gravity (LQG) and String Theory are two prominent theoretical frameworks in modern physics that aim to reconcile general relativity with quantum mechanics. While both approaches seek to provide a quantum theory of gravity, they differ in their fundamental assumptions, mathematical formalism, and predictions.
While GR comprehends gravity geometrically, LQG (in short, loop gravity) provides quantum picture of space-time with the aid of quantum theory. Therefore, LQG is also known as quantum geometry as it quantizes geometry and promotes geometric operators or geometric observables such as area and volume as quantum operators.
In Sections 3 and 4, I describe the non-fundamentality of time in two approaches to quantum gravity, namely the two-dimensional field theory—which is an approach to string theory—and loop quantum gravity. In Section 5, I argue that this non-fundamentality entails eternalism.
View a PDF of the paper titled Connecting Loop Quantum Gravity and String Theory via Quantum Geometry, by Deepak Vaid. We argue that String Theory and Loop Quantum Gravity can be thought of as describing different regimes of a single unified theory of quantum gravity.
This demonstration—simulating a simple LQG transition with linear optics—is the first step towards full-scale simulations of loop quantum gravity, which is currently intractable with classical...
A short review of loop quantum gravity. Reports on Progress in Physics. KEY ISSUES REVIEW. $VKRUWUHYLHZRIORRSTXDQWXPJUDYLW\. To cite this article: Abhay Ashtekar and Eugenio Bianchi 2021 Rep. Prog. Phys. 84 042001. View the article online for updates and enhancements. You may also like.