Is the energy and mass of the universe constant?

Click For Summary
SUMMARY

The discussion confirms that, according to current accepted cosmological models, the mass and energy of the universe remain constant. Participants clarify that while speed is a scalar quantity, velocity, which is a vector, is more relevant when discussing motion in the universe. The conversation also touches on the implications of these concepts for understanding the total speed of matter over time, suggesting that assumptions about speed require a static reference point for accurate measurement.

PREREQUISITES
  • Understanding of basic physics concepts, particularly mass and energy conservation
  • Familiarity with scalar and vector quantities in physics
  • Knowledge of cosmological models and theories
  • Basic grasp of motion and reference frames in physics
NEXT STEPS
  • Research the implications of mass-energy equivalence in modern physics
  • Explore different cosmological models, including the Standard Model of Cosmology
  • Study the differences between scalar and vector quantities in physics
  • Investigate new theories in cosmology that challenge traditional views on mass and energy
USEFUL FOR

Students of physics, cosmologists, and anyone interested in the fundamental principles governing the universe's mass and energy dynamics.

azzkika
Messages
60
Reaction score
0
Is the energy and mass of the universe constant??

is the energy and mass of the universe constant??

if so does this mean that the total speed of all matter, if totalled, is the same irrespective of time??

if not, does it mean the sum total of speed of matter will increase or reduce correspondingly to increase or reduction of energy??

or is such an assumption impossible without a static point to measure speed??
 
Last edited:
Space news on Phys.org


Of course the speed will not be the same, as speed is a scalar. Velocity, on the other hand, is a vector and is more what I think you had in mind. Mass and energy in the universe remains constant under all current "Accepted" cosmological models (although not some of the newer proposed theories).

V
 

Similar threads

Undergrad Does the amount of hidden mass remain constant?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Hubble Constant, Dark Energy and the Expanding Universe
  • · Replies 20 ·
Replies
20
Views
5K
Undergrad Dark energy contributing to, or modifying, mass estimates?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Gravitational Instability and accelerated explanation of Universe?
  • · Replies 19 ·
Replies
19
Views
3K
Undergrad Questions on the consequence of an evolving dark energy parameter
  • · Replies 1 ·
Replies
1
Views
3K
High School Does dark energy or cosmic inflation explain flatness?
  • · Replies 37 ·
2
Replies
37
Views
6K
High School Why doesn't cosmic inflation violate conservation of energy?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Questions about Negative Pressure and Vacuum Energy
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Does the Universe's Expansion lead to Critical Mass < 1?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Do particles leave behind an image when crossing cosmo event horizon?
  • · Replies 14 ·
Replies
14
Views
4K