Quantized space-time and redshift.

Click For Summary
SUMMARY

The discussion centers on the implications of quantized space-time in Loop Quantum Gravity (LQG) and its relation to redshift. Participants argue that if space-time is quantized at the Planck scale, light from distant stars, originating in younger domains, must traverse larger units of space-time, resulting in redshift due to energy conservation. The conversation highlights the significance of the invariant speed of light and the potential for mass to distort space-time, affecting light's properties without invoking gravitational effects. The consensus is that while the concept is complex, it is a valid exploration of the relationship between space-time quantization and redshift.

PREREQUISITES
  • Understanding of Loop Quantum Gravity (LQG)
  • Familiarity with the Planck scale and its implications
  • Knowledge of redshift and its cosmological significance
  • Basic principles of General Relativity and Lorentz transformations
NEXT STEPS
  • Research the implications of quantized space-time in Loop Quantum Gravity
  • Study the relationship between redshift and the Doppler effect
  • Explore the concept of gravitational lensing and its effects on light
  • Investigate the latest findings in quantum gravity and its impact on cosmology
USEFUL FOR

Astronomers, physicists, and researchers interested in the intersection of quantum mechanics and cosmology, particularly those exploring the nature of space-time and redshift phenomena.

  • #31
turbo-1 said:
Here's a link to an article about a bright young Greek Physicist working in Canada. There are still experiments in the works that might probe the fine structure of spacetime...GLAST (scheduled for 2006) may be able to detect whether gamma rays of very short wavelength can be slowed by interference with space-time at very small scales.

http://www.greece.gr/GLOBAL_GREECE/SPOTLIGHT/thinkingatthespeedoflight.stm?content_ID=16
One piece of good news - for some of us! - is that the only likely accessible* regime where LQG, String/M Theory, whatever, may be tested (in the next century or three) is high energy astrophysics (and gravity wave detectors) - GLAST, AMANDA, the various cosmic ray observatories (including the gamma ones); LISA, LIGO, ... If history is any guide, anyone of these will quite likely turn up quite unanticipated phenomena (and maybe also constrain some 'unified physics' out of the ballpark), showing yet again that the universe is richer, more complex, more wonderful than we puny Homo sap. mammals can even imagine.

*some possible 'local' ones: investigations into short-range deviations from inverse square for gravity, something unexpected from the LHC, even a 'routine' two-more-decimal-points study of something already 'well known'
 
Last edited by a moderator:

Similar threads

Undergrad Challenges to the Redshift Method and Hubble's Law
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Energy conservation in Doppler (NOT cosmological) redshifts?
  • · Replies 13 ·
Replies
13
Views
3K
Graduate How deep in a gravitational well are we?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Chunks of action smaller than Planck's constant
  • · Replies 2 ·
Replies
2
Views
1K
Graduate How do you convert the Pound–Rebka redshift into time variation?
  • · Replies 6 ·
Replies
6
Views
780
Undergrad Galaxy MoM-z14 - furthest observed object
  • · Replies 9 ·
Replies
9
Views
1K
High School Detecting cosmological redshift in an empty part of the Universe
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Is Space-Time Continuous or Quantized?
  • · Replies 10 ·
Replies
10
Views
3K
High School Consequences of the Existence of Gravitational Waves?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Photons and Space-Time Expansion
  • · Replies 5 ·
Replies
5
Views
2K