Conservation of energy is maintained despite the expansion of space
the verdict
CONTESTED PARTIAL
refutedsupported
the weight of evidence
1 source for · 1 against
AS REPORTEDno primary record reached; this is what the reporting says
The available literature provides partial and conflicting perspectives on energy conservation in an expanding universe, noting that while local formulations or specific conditions exist, overall cosmological expansion introduces complications regarding global energy conservation.
other forms of energy in the Universe. In Special Relativity, the flux of energy and momentum … equation (gR3)- = -p(R3)- identically. The expansion energy is gained from the negative pressure … by Koo Sz Kron (1992). 1.3 The expansion law The expansion of the Universe means that
Cosmology, the physics of the universe : proceedings of the Eighth Physics Summer School : the Australian National University, Canberra, Australia, 16 January-3 February 1995 : Physics Summer School (8th : 1995 : Australian National University) : Free Download, Borrow, and Streaming : Internet Archive Skip to main content Keep the news in the Wayback Machine. Sign Fight for the Future's letter .
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Favorite Share Flag Flag this item for Graphic Violence Explicit Sexual Content Hate Speech Misinformation/Disinformation Marketing/Phishing/Advertising Misleading/Inaccurate/Missing Metadata texts Cosmology, the physics of the universe : proceedings of the Eighth Physics Summer School : the Australian National University, Canberra, Australia, 16 January-3 February 1995 by Physics Summer School (8th : 1995 : Australian National University) Publication date 1996 Topics Astrophysics -- Congresses , Cosmology -- Congresses Publisher Singapore ; River Edge, NJ : World Scientific Collection trent_university ; internetarchivebooks ; inlibrary ; printdisabled Contributor Internet Archive Language English Item Size 1.4G ix, 531 p.
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# Do Friedmann's equations really result in energy conservation?
Tags: general-relativity, energy, cosmology, energy-conservation, space-expansion
- Score: 0
- Views: 360
- Answers: 1
- Answered: yes
- Asked by: NeStack (157 rep)
- Asked: 2021-05-07
- Edited: 2021-05-07
- Site: physics
## Question
I was looking into Friedmann's equations for the evolution of the universe and encountered that if one combines them they result in
$$dE + dpV = 0$$
as noted here in equ. 29.11. and the author claims this is an expression of the first law of thermodynamics and the conservation of energy.
But wouldn't this equation say that while a volume of the universe (or the whole universe) is expanding it would lose energy, and this must hold for all volumes of the universe, so the universe as a whole must lose energy?
I am not sure if it makes a difference to this case, but also the actual first law of thermodynamics is formulated as
$$dE + dpV - dQ = 0$$
so we should actually also include the heat transfer, shouldn't we?
In some literature, it is said that the first equation expressed the local energy conservation. I am not sure how to understand that, but maybe this resolves my question, doe