Does vacuum energy rely on the existence of matter?

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Discussion Overview

The discussion revolves around the nature of vacuum energy and its potential existence in a universe devoid of matter. Participants explore theoretical implications, definitions of matter, and the relationship between vacuum energy and electromagnetic fields, engaging in both conceptual and philosophical reasoning.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Philosophical

Main Points Raised

  • Some participants propose that vacuum energy can exist independently of matter, suggesting that it is a fundamental aspect of the electromagnetic field.
  • Others argue that the existence of vacuum energy may rely on the presence of charged particles, as the electromagnetic field is tied to these particles.
  • A participant questions the definition of matter, asking whether entities like gravitons or hypothetical constructs like Boltzmann brains qualify as matter.
  • Some express difficulty in conceptualizing a universe without matter, positing that spacetime itself is dependent on the existence of matter to facilitate events.
  • Another viewpoint suggests that vacuum fluctuations are a consequence of quantum mechanics, which may persist regardless of the presence of matter.
  • There is a contention regarding whether the electromagnetic field can exist without charged particles, with some asserting that a flat electromagnetic field would imply no vacuum energy.
  • A participant highlights that mass does not create the electromagnetic field but rather allows for its measurable expressions, indicating a distinction between the field and its manifestations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether vacuum energy can exist without matter. Multiple competing views are presented, with some asserting its independence from matter and others arguing for a necessary connection.

Contextual Notes

Definitions of matter and the implications of a universe devoid of it are not fully resolved, leading to varying interpretations of the relationship between vacuum energy and electromagnetic fields.

diffusion
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From what I understand, vacuum energy is a form of energy that exists in freespace, even when completely devoid of matter. So, I have two questions:

1. Can vacuum energy exist if there were no matter anywhere in the universe?

2. If so, where does this vacuum energy come from?
 
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diffusion said:
From what I understand, vacuum energy is a form of energy that exists in freespace, even when completely devoid of matter. So, I have two questions:

1. Can vacuum energy exist if there were no matter anywhere in the universe?

2. If so, where does this vacuum energy come from?

what do you include in your idea of matter? are gravitons matter? are "Boltzmann brains", if they exist, matter? if space has a nonzero temperature does this require the existence of some sort of matter? I find it hard to imagine a universe without matter.

================

I guess one reason I find it hard to imagine a spacetime with "no matter anywhere" is that
spacetime is basically a network of relationships between events-----some version of matter seems to be required in order for there to be events:confused:
without matter, no events----without events, no spacetime

maybe someone else can see more clearly what you are talking about, and give a better answer
 
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well, vacuum energy is caused by the uncertainty fluctuation of an electromagnetic field, so I guess you're asking... if there were no charged particles, would the electromagnetic field still exist... well, I would say that the fact that vacuum energy exists in the first place gives the field a real existence, so I would imagine that it would still exist and fluctuations in it would still occur... unless of course the existence of the vacuum fluctuations relies on the em gauge symmetry being local (I don't see why it would) in which case they, like all other em phenomena, would cease
 
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marcus said:
what do you include in your idea of matter? are gravitons matter? are "Boltzmann brains", if they exist, matter? if space has a nonzero temperature does this require the existence of some sort of matter? I find it hard to imagine a universe without matter.

================

I guess one reason I find it hard to imagine a spacetime with "no matter anywhere" is that
spacetime is basically a network of relationships between events-----some version of matter seems to be required in order for there to be events:confused:
without matter, no events----without events, no spacetime

maybe someone else can see more clearly what you are talking about, and give a better answer

I know, its slightly confusing, but I was asked this question in an astronomy class and must write a paragraph on it. I suppose matter is defined as anything that has mass and is made of fundamental particles such as quarks. Let's say no matter ever existed anywhere in the first place, and suppose all that is left to make up the "universe" is a completely flat, empty spacetime with no mass or radiation of any kind: could vacuum energy exist then?
 
SpitfireAce said:
well, vacuum energy is caused by the uncertainty fluctuation of an electromagnetic field, so I guess you're asking... if there were no charged particles, would the electromagnetic field still exist...

I suppose this answers the question actually. No matter = no charged particles = no electromagnetic field = no vacuum energy, assuming charged particles or any other form of matter never existed in the first place.
 
well, that's like saying that space-time doesn't exist without matter... I think it would, it would just be flat (non-local)... well, the electromagnetic field is the same... if there were no charged particles the electro-magnetic field would be flat and a have a value of 0... the reason that the vacuum energy exists in the first place is because the uncertainty principle prohibits you from knowing the position (field value) and momentum (energy) of the field... if the electro-magnetic field is flat and the energy is 0, you know both at any given point... thus the energy at anyone point in the field never drops down to exactly 0, but fluctuates around... these fluctuations are "vacuum energy"... so the field, with or without charged particles, would fluctuate according to quantum mechanics... all the classical electromagnetic phenomena like light depend on there being charged particles (local field) and thus would not exist (just like gravity wouldn't exist without massive objects)... but vacuum energy doesn't depend on whether or not charged particles exist in the field, it only depends on the Rules of Quantum Mechanics, which would still exist without matter... that's my reasoning... but this is pretty philosophical since our physics is based on a world with matter...
 
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I don't think that the source of the electromagnetic field phenomena is created by mass. Mass just enables an expression of the electromagnetic field that we can measure. Because all we detect is the expression of the magnetic field, we tend to confuse the expression with the field itself.
 
Because the field has the ability to make expressions, it must contain that which is expressed.
 

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