Linked Questions
79
votes
6
answers
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Is the total energy of the universe zero?
In popular science books and articles, I keep running into the claim that the total energy of the Universe is zero, "because the positive energy of matter is cancelled out by the negative energy of ...
user1265
33
votes
3
answers
20k
views
Is the law of conservation of energy still valid?
Is the law of conservation of energy still valid or have there been experiments showing that energy could be created or lost?
user11151
20
votes
5
answers
25k
views
Is the total energy of the universe constant?
If total energy is conserved just transformed and never newly created, is there a sum of all energies that is constant? Why is it probably not that easy?
- 1,053
9
votes
4
answers
3k
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Why was more dark energy created during the creation of the Universe than normal energy?
I would like to know if there is an agreed upon explanation within the field of physics as to why more dark energy than normal energy was created during the creation of the Universe.
More is unknown ...
user300400
3
votes
1
answer
3k
views
What is the source of energy of the universe?
For example, our human body obtains the energy for work by food, water etc for the nutrition, the plants require water, fertilizer for nutrition to produce food, machines require fuel to work, may it ...
- 41
4
votes
3
answers
400
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Is it always possible to define energy of a system? [closed]
Does the concept of energy always exist for any physical system?
If yes is there a proof?
If no, any counterexamples?
- 372
1
vote
2
answers
311
views
Is it possible that black holes might devour all masses of the universe?
I am only an interested layman in cosmology and GR. In recent years, we have learned that black holes indeed exist in the universe and that almost all galaxies contain massive black holes in their ...
- 17.1k
0
votes
3
answers
236
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Are these conservation laws always true?
Imagine a system of particles with the internal force on $i^{th}$ particle due to $j^{th}$ particle being given as $f_{ij}$
From the derivation of law of conservation of momentum and law conservation ...
- 2,020
-3
votes
1
answer
461
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The Zero Energy Hypothesis and its consequences for particle creation and dualist interactionism
Most attacks on the possibility of dualist interaction cite the conservation of energy as a definitive objection. I have attempted to investigate the validity of this objection, and have found a ...
- 65
3
votes
1
answer
170
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Baryon asymmetry still going on
I read these questions and answers and it made me curious.
Baryon asymmetry
Why do we believe baryon asymmetry?
Why does matter-antimatter asymmetry only refer to baryon asymmetry?
How does ...
- 29.3k
1
vote
1
answer
290
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What is meant by “Energy is exactly conserved locally in GR. Inflation and Dark Energy isn't an exception to this.”?
In Ben Crowell’s comments in these threads
Attractive gravity has negative energy, what about repulsive gravity in the inflation phase?
Does the fact that energy is not conserved in cosmology open ...
- 855
0
votes
1
answer
167
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How does an expanding universe and a constant-density vacuum energy not violate energy conservation? [duplicate]
As per the title. I'm probably thinking too naively in a classical way, but intuitively it seems to me that:
the presence of vacuum energy at fixed density throughout all space and,
an expanding ...
