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### A Short Review Of Loop Quantum Gravity

An outstanding open issue in our quest for physics beyond Einstein is the
unification of general relativity (GR) and quantum physics. 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 continuum breaks down. We present a brief overview of
the main ideas underlying LQG and highlight a few recent advances. This report
is addressed to non-experts. Apr 9, 2021 ... Abstract: An outstanding open issue in our quest for physics beyond Einstein is the unification of general relativity (GR) and quantum ...
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### Could Quantum Gravity Allow Us To Time Travel?

Some of the leading theories of quantum gravity prohibit it, while in others, time travel happens all the time. Sep 9, 2019 ... Therefore, it looks like loop quantum gravity does not allow time travel. Causal Set Theory. In causal set theory, all of space, time, and ...
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### The String-loop Theory That Might Finally Untangle The Universe | New ...

Could two rival theories of the make-up of the cosmos really be the same thing? Pulling at the threads could reveal a deeper reality Mar 8, 2017 ... The upstart contender, loop quantum gravity, has more modest aspirations – but could still change the face of physics as we know it.
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### Loop Quantum Cosmology | SpringerLink

One particular theory is loop quantum cosmology, an application of loop quantum gravity to homogeneous systems, which removes classical singularities.
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### What Is Spacetime Really Made Of? - Scientific American

Spacetime may emerge from a more fundamental reality. Figuring out how could unlock the most urgent goal in physics—a quantum theory of gravity Feb 1, 2022 ... While quantum physics treats space and time as immutable, ... both loop quantum gravity and string theory suggest spacetime emerges from ...
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### String Theory And Loop Quantum Gravity - Dummies

Loop quantum gravity is string theory’s biggest competitor. It gets less press than string theory, in part because it has a fundamentally more limited goal: a quantum theory of gravity. Loop quantum gravity performs this feat by trying to quantize space itself — in other words, treat space like it comes in small chunks.
In contrast, string theory starts with methods of particle physics and frequently hopes to not only provide a method of creating a quantum theory of gravity, but also explain all of particle physics, unifying gravity with the other forces at the same time. Oh, and it predicts extra dimensions, which is very cool!
It’s no wonder that loop quantum gravity has more trouble getting press.
The key insight of quantum physics is that some quantities in nature come in multiples of discrete values, called quanta. This principle has successfully been applied to all of physics, except for gravity. This is the motivation for the search for quant Mar 26, 2016 ... Loop quantum gravity is string theory's biggest competitor. It gets less press than string theory, in part because it has a fundamentally more ...
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### String Theory Meets Loop Quantum Gravity | Quanta Magazine

Two leading candidates for a “theory of everything,” long thought to be incompatible, may be two sides of the same coin. Jan 12, 2016 ... 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 ...
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### The Continuum Limit Of Loop Quantum Gravity-a Framework For Solving ...

The construction of a continuum limit for the dynamics of loop quantum
gravity is unavoidable to complete the theory. We explain that such a
construction is equivalent to obtaining the continuum physical Hilbert space,
which encodes the solutions of the theory. We present iterative coarse graining
methods to construct physical states in a truncation scheme and explain in
which sense this scheme represents a renormalization flow. We comment on the
role of diffeomorphism symmetry as an indicator for the continuum limit. ... the dynamics of loop quantum gravity is unavoidable to complete the theory. ... General Relativity and Quantum Cosmology (gr-qc); High Energy Physics ...
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### What Every Layperson Should Know About Quantum Loop Gravity

You might have heard about the theory of Loop Quantum gravity but what is it? How does it unify the laws of physics? Is it better than string theory? May 15, 2021 ... The big success of loop quantum gravity is that it manages to combine general relativity and quantum mechanics in their currently accepted forms ...
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**The pages related to loop quantum physics are also listed below: **

### Loop Quantum Gravity: Does Space-time Come In Tiny Chunks? | Space

Are there fundamental units of space-time at some unfathomably tiny scale? Feb 23, 2022 ... Einstein's theory of general relativity tells us that the warping of space and time is what we experience as the force of gravity. Quantum ...
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### The Illusion Of Time

Andrew Jaffe probes Carlo Rovelli’s study arguing that physics deconstructs our sense of time. Apr 16, 2018 ... Rovelli is one of the creators and champions of loop quantum gravity theory, one of several ongoing attempts to marry quantum mechanics with ...
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