Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Astronomy and Cosmology
Cosmology
"Energy is not conserved" vs. energy is conserved: Friedmann Equations
Reply to thread
Message
[QUOTE="PeterDonis, post: 6867755, member: 197831"] What Carroll means is that there is no global "energy" that is conserved in the spacetime that describes our universe (or indeed in any non-stationary spacetime). That equation is not an equation of global energy conservation. It is an equation of local stress-energy conservation. Local conservation of stress-energy is guaranteed by the Einstein Field Equation and applies to any spacetime. Sort of. See above. It isn't, at least not in the sense you are used to. You can do thermodynamics in curved spacetime, but it's more complicated than ordinary thermodynamics. And it will still end up telling you that there is no global conserved energy in a non-stationary curved spacetime. [/QUOTE]
Insert quotes…
Post reply
Forums
Astronomy and Cosmology
Cosmology
"Energy is not conserved" vs. energy is conserved: Friedmann Equations
Back
Top