Hypothetical particles and states of matter that have not yet been encountered, but whose properties would be within the realm of mainstream physics if found to exist.
Questions tagged [exotic-matter]
71 questions
28
votes
2 answers
Building a wormhole
We regularly get questions about wormholes on this site. See for example Negative Energy and Wormholes and How would you connect a destination to a wormhole from your starting point to travel through it?. Various wormhole solutions are known, of…
John Rennie
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24
votes
5 answers
How does Positronium exist?
I've just recently heard of Positronium, an "element" with interesting properties formed by an electron and positron, and I was shocked to hear that physicists were actually working with this element, even if for a very short lifetime. I was always…
Nick
- 1,457
16
votes
5 answers
Does matter with negative mass exist?
Or does it exist mathematically?
Is it really inconsistent with a common-sense, mathematics or known physical laws?
As far as I understand, if it exists, it must be far away from the "positive" matter because of repelling force, so it explains why…
Serg
- 325
14
votes
2 answers
Calculating the mass of a wormhole
What would for an observer be the mass of an isolated wormhole (meaning that there is no gas and no mass of stars around it) if the wormhole mouth opposite to the observer reflects the light of a region from the galaxy it opens into.
Wormholes per…
Barnaby
- 347
10
votes
1 answer
Negative mass, or just the 'appearance' of negative mass? What's the acid test?
Breaking news here claim researchers at Washington State University have created negative mass by the characteristic that if you push it, it accelerates in the opposite direction.
The so called negative mass is a collection of rubidium atoms forming…
docscience
- 11,779
8
votes
1 answer
Negative Energy and Wormholes
Apparently to create wormholes you need negative energy/matter. Say you had negative matter/energy, how would it be applied towards making a wormhole?
Karric
- 123
6
votes
4 answers
What is negative Energy/Exotic Energy?
So I have been researching around a little as I am highly interested in Astrophysics and I came across an energy I have never heard of before; negative energy also commonly known as exotic energy. Now I started to research this however I found the…
Alex Wiley
- 163
6
votes
1 answer
Are quantum "virtual negative-energy particles" the same as "negative energy density" in EFEs?
Question is fairly straightforward. Quantum theory describes negative energy in the form of the Casimir effect and virtual negative energy particles. In the Einstein field equations, negative energy is where energy density is negative.
What I'm…
crockpotveggies
- 207
5
votes
2 answers
Which features of the Morris-Thorne wormhole require exotic matter?
This particular solution has some features that make gives it more utility for humans, such as time stability, enough size for someone to transverse it and other things made for humans. Could an advanced civilization abandon some of these to just…
5
votes
0 answers
Violations of the Achronal averaged null energy condition
Many energy conditions have been shown to be violated in the past in semiclassical gravity, for instance when considering Klein-Gordon quantum scalar fields. Victims include the WEC (Weak Energy Condition), NEC (Null Energy Condition), SEC (Strong…
Rexcirus
- 5,191
5
votes
1 answer
Are white holes made of exotic matter
I have recently watched Kurzgesagt in a Nutshell's video on Wormholes https://www.youtube.com/watch?v=9P6rdqiybaw and I have been thinking about white holes, and exotic matter.
As I understand, white holes are an exact opposite of black holes, Black…
rcw
- 107
4
votes
3 answers
Wormhole traversability in general relativity
It is well known that stable, traversable wormholes require exotic matter that violate the dominant energy conditions.
For the purpose of the question, let's assume enough exotic matter can be created for a brief period of time, where the wormhole…
lurscher
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4
votes
1 answer
Strange Matter and Neutron Stars
If strange matter is theoretically able to be created in the core of some neutron stars, why don’t we see whole strange stars? Strange matter converts all matter to itself, so it should turn the star into a big blob of strange matter.
Although, if…
Jkt
- 61
4
votes
1 answer
Exotic Matter: Stabilizing Wormholes
Background
I know wormholes are still hypothetical but this is pertaining to exotic matter and it's effect on wormholes. Reading through various sources, they all specify that if wormholes exist, they would collapse almost instantaneously and that…
Qubic Lens
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4
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What is the name of matter with $w = - \frac{1}{3}$?
What kind of "matter" is described by the following thermodynamic relation ?
\begin{equation}\tag{1}
p = -\, \frac{1}{3} \; \rho,
\end{equation}
Where $p$ and $\rho$ are the pressure and density respectively. The sign is important here. This isn't…
Cham
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