How Loop Quantum Gravity Could Match Anomalies in the CMB with Large Structures in the Modern Universe

The workings of the Universe.
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fred8615
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How Loop Quantum Gravity Could Match Anomalies in the CMB with Large Structures in the Modern Universe

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Our universe is best described by the LCDM model. That is an expanding universe filled with dark energy (Lambda), and dense clumps of cold dark matter (CDM). It is also sprinkled with regular matter that makes up planets, stars, and us, but that only makes up about 4% of the cosmos. While we don’t know what dark matter and dark energy are, we know how they behave, so the ?CDM model works exceptionally well. There’s just one small problem.

The LCDM is defined by several parameters, such as the value of the Hubble Constant, which determines how quickly the universe is expanding, or the baryon density parameter, which describes the scale at which galaxies cluster together. Several independent experiments have measured these parameters, and they get results that slightly disagree. For example, observations of distant galaxies give a Hubble Constant that is higher than the value found from the Cosmic Microwave Background (CMB). These disagreements are known as a tension in the LCDM model. It is perhaps the biggest problem in modern cosmology.

One way to address this problem is to look to new experiments, such as those involving gravitational wave astronomy. But so far, these haven’t made things better. Another path is to look toward new physics, specifically, theories that extend the standard model of particle physics.

Read more: https://www.universetoday.com/147301/ho ... -universe/
Frederick J. Barnett
"Someone's got to take the responsibility if the job's going to get done!! Do you think that's easy?!" Gregory Peck - The Guns Of Navarone

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