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Questions tagged [exotic-matter]

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Could there be states of matter that could avoid "matter decay"?

Regular structures of matter may decay over extremely long periods of time (especially if proton decay occurs, which is not proven but it remains a possibility) Even if that happens, are there any ...
vengaq's user avatar
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1 answer
111 views

Are pure quark stars possible?

Has it been established that structures formed from quarks (like quark stars: https://en.wikipedia.org/wiki/Quark_star) are possible in principle ? I have read about the possibility that inside ...
vengaq's user avatar
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Stable/metastable nuclei with excited nucleon states

I was reading about nucleon excited states such as the delta, and saw a passing comment that some nuclei may have a delta or N particle in place of an ordinary nucleon, and that said nuclei were “...
Steve Foster's user avatar
2 votes
0 answers
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Could the LHC create a strangelet by creating another multi-strange particle that then interacts with a nucleus?

I became interested in the discussions about potential catastrophic risk from colliders and I have some questions about it. I am particularly interested in the strange matter scenario, and there is ...
Alex319's user avatar
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What would happen if a multi-strange particle were absorbed by an atomic nucleus?

I have been reading about the hypothetical possibility of "strange matter consuming the Earth" and there is one thing I don't understand. I understand that it has been shown that it is ...
Alex319's user avatar
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Is there a list anywhere of known or hypothetical hypernuclei?

Does anyone have resources that include a list or set of descriptions of hypernuclei that been observed, or been proven to be possible hypothetically? Is it possible, even, that there is something ...
blacktopshaman's user avatar
3 votes
1 answer
540 views

What are strange metals?

What are strange metals? Are they something that we have really made, or just a theoretical idea? If they have been prepared in laboratory, then what are their properties (or if they are still a ...
user2800708's user avatar
3 votes
0 answers
83 views

Why is most of the matter in the universe made of hydrogen instead of helium? Or iron?

Hydrogen, while being the simplest element, is near a peak of the binding potential curve. Presumably in the first 1 second or less of the Big Bang timeline, densities and temperatures were such to ...
RC_23's user avatar
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Is it possible for there to exist metastable exotic atoms?

I've been quite fascinated with the invention and discovery of exotic atoms such as: positronium, and muonic hydrogen etc... Now I know positronium has a longer than usual lifetime because it is in a ...
Sidharth Ghoshal's user avatar
2 votes
0 answers
47 views

Mass curves spacetime. Is there any theorized "anti-mass" that counteracts this effect? [duplicate]

Things like faster-than-light travel have very good reasons for being believed theoretically impossible (e.g. they allow traveling backwards in time). Things like magnetic monopoles are seemingly ...
chausies's user avatar
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5 votes
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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 ...
Rexcirus's user avatar
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If the universe was dominated by antimatter instead of matter, would we physically notice?

I read that antimatter and matter are identical aside from their opposite charge and quantum number. Of course, the mystery of why matter dominates in our universe is an active field of research. But ...
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-1 votes
2 answers
332 views

What would happen if you dumped negative mass into an extremal black hole? [closed]

What would happen if you dumped negative mass into a near-extremal black hole? It appears to me that doing this would reduce the Black hole's mass without reducing the angular momentum or charge? ...
blademan9999's user avatar
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Strange matter and star quakes

If neutron stars are able to form into strange matter at its core, wouldn’t this be enough to disrupt it and cause noticeable star quakes? Edit: Could it cause it to go supernova? I also know that it ...
Jkt's user avatar
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1 answer
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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 ...
Jkt's user avatar
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1 vote
2 answers
555 views

Is $ud$ matter more dangerous than strange matter?

I have seen videos online about how dangerous strange matter is... which is something I have never understood since strange matter created in a lab always disappears very quickly. However I watched ...
Rick's user avatar
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1 vote
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One Dimensional Heterostructures

Van Der Walls Heterostructures stack different single layer materials together. However, just as a layer of various graphene sheets form graphite with weak bonding in between making the layers easily ...
Evamentality's user avatar
1 vote
1 answer
156 views

How can I "match" energy-momentum tensors in Einstein Field Equations?

I) CONTEXT: When we study exotic solutions of Einstein Field Equations (EFE), such as Traversable Wormholes, the elementary modus operandi to extract some analysis is to deal with EFE in the following ...
M.N.Raia's user avatar
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0 answers
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Why is runaway motion predicted? [closed]

The theorethical concept of negative mass brings with it some interesting calculations, like how time supposedly speeds up around great negative masses. One of those effects, fir example, shows that ...
Mat NX's user avatar
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1 answer
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Are Dark Matter and Antimatter "states" of matter? What broad category do these fall into?

This question is more to do with what matter is and what matter is not. We know that there is something called matter, which is basically everything we see around us. 17 fundamental particles make up ...
Akhilesh Balaji's user avatar
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1 answer
642 views

Is there a difference between negative mass and negative energy?

I was recently reading a bit about negative mass and negative energy. Since mass and energy are linked by the famous equation $$E=mc^2$$ I would expect that the energy of any mass which is negative ...
jng224's user avatar
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Did researchers discover a new type of matter inside neutron stars?

I just read the University of Helsinki press release Researchers discover a new type of matter inside neutron stars on phys.org. It states that a Finnish research group has found strong evidence for ...
1 vote
0 answers
45 views

What do we know about the features of Dark Matter? [closed]

In 2020, how much information have we got about this matter? I'm just curious.
Oqtay Quliyev's user avatar
0 votes
1 answer
222 views

Alcubierre drive: what is the nature of exotic matter? [closed]

In connection with Alcubierre drive we often hear about necessity of an exotic matter in order to produce a negative energy density. I suspect that such matter has no place in standard particle model. ...
Martin Vesely's user avatar
2 votes
1 answer
209 views

In regards to the hypothetical Alcubierre Drive (hear me out), are energy costs consumed immediately, or during transit?

I am aware the Alcubierre Drive is highly hypothetical and likely cannot exist. However, there are significant quantities of research material into Warp Drives of many types, and presumably the answer ...
MrKred's user avatar
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1 vote
0 answers
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What if black holes consumed exotic matter? [closed]

I've just watched Kurzgesagt in a Nutshell and I've been thinking of exotic matter for a while. What if black holes tried to consume exotic matter?
Sci Pred's user avatar
2 votes
2 answers
386 views

What is the adiabatic index of stiff matter?

In relativity, "stiff matter" is described by the relation $p = \rho$, where $p$ is the fluid's pressure and $\rho$ is its total energy density. The sound velocity in stiff matter equals the velocity ...
Cham's user avatar
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1 vote
1 answer
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Physical meaning of the instability of NEC violating material

Stephen Hsu and Roman V. Buniy published a paper in which they demonstrated that, for a large class of different models, any materials or fields that violated the Null Energy Condition would be "...
CuriousDroid's user avatar
2 votes
0 answers
92 views

Can one show that hypernuclei are always unstable?

Normal atomic nuclei are composed of protons and neutrons, where the local interactions stabilize the neutrons that are unstable in isolation. Hypernuclei have one or more strange hadrons beside the ...
Anders Sandberg's user avatar
1 vote
2 answers
303 views

Minimum amount of negative energy required in warp drive spacetimes

In the pioneering work of Alcubierre, to power a warp drive-like geometry it is necessary to employ an amount of negative energy larger (in absolute value) than the whole observable universe mass. A ...
Rexcirus's user avatar
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2 votes
0 answers
434 views

If negative mass should exist, how would conservation of momentum work?

Imagine that a particle with negative mass has been discovered. It is known to obey both the equivalence principle and Newton's second law. This means that the particle is a subject to repulsive ...
csha's user avatar
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5 votes
1 answer
2k views

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 ...
rcw's user avatar
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0 answers
53 views

What elements would be created by bombarding quark matter with neutrons?

Assuming we managed to find or create either Strange Quark Matter or UpDown Quark Matter, I've read the suggestion that it would be stable, but that bombarding it with neutrons would cause it to break ...
freyley's user avatar
  • 101
0 votes
1 answer
584 views

Has experimental search for free fractional electric charge elementary particles been put to an end?

Since Quantum Chromo-Dynamics theory has been supposed to explain quarks confinement, has experimental search for free fractional electric charge elementary particles been put to an end? If not, what ...
laboussoleestmonpays's user avatar
1 vote
2 answers
130 views

Can nuclei ever "liquify"?

I've been reading about degenerate matter and how extreme temperatures and pressures can impact the way it organizes itself. Plasma is a type of matter where the energy of the matter allows electrons ...
user189728's user avatar
2 votes
2 answers
273 views

What is the difference between a deuterium nucleus and a sexaquark?

Assume a sexaquark contains 3 up and 3 down quarks. What is the difference between this and a deuterium nucleus containing a proton bound to a neutron? Is there any difference?
user avatar
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0 answers
53 views

Can the three dimensional analogue of a cross cap exist without exotic matter?

Let us topologically construct the 3D analogue of a Cross-cap. What we start with 3D euclidean space, and then remove a solid torus. This torus will have an axis of symmetry. We glue each point on the ...
Christopher King's user avatar
3 votes
2 answers
545 views

Can the mouths of a worm-hole be torus shaped?

Theoretically, most wormholes should have spherical mouths (if they exist). Could have a wormhole have torus-shaped mouths? What about other shapes?
Christopher King's user avatar
0 votes
0 answers
52 views

Theoretical basis for wormholes [duplicate]

From what little I know about general relativity, energy (and equivalently mass) distorts and curves spacetime due to the Einstien Field Equations. I also know "wormholes" are theoretically solutions ...
Nico A's user avatar
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3 votes
2 answers
468 views

Would a Cavorite-like material violate any conservation laws?

This post addresses a similar question, but rather than using gravitons as a means of propulsion, my question addresses the blocking of gravitational fields using a hypothetical passive material such ...
docscience's user avatar
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4 votes
1 answer
3k views

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, ...
Qubic Lens's user avatar
8 votes
1 answer
2k views

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 ...
docscience's user avatar
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1 vote
1 answer
178 views

Obtaining exotic matter (formula) in the process of computer simulation

It is theoretically be possible to obtain exotic matter on the basis of ordinary matter? Assume that we have infinite computational resources. Is there a way to simulate the process of obtaining ...
Aurelio's user avatar
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1 vote
0 answers
287 views

How do time crystals not contradict thermodynamics?

Given that one of the basic properties of time crystals is that they move without any energy being applied, does that not mean that it's producing more energy than it's receiving? How does that not ...
DonielF's user avatar
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1 vote
0 answers
86 views

Appearance of room-temperature strange matter

Assuming strange matter is stable at zero pressure, how might a chunk of room-temperature strange matter look? Assume it's in a zero-gravity vacuum. Would it be transparent or opaque? Would it appear ...
MackTuesday's user avatar
3 votes
2 answers
253 views

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 ...
Cham's user avatar
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-1 votes
1 answer
51 views

If all matter expanded [closed]

I know this is impossible (?), but what would happen if the electron orbit swelled, the gluons extended, and quarks lost density in relation to the gluons, would that affect the universe as we know it?...
nelomad's user avatar
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0 answers
325 views

Why is there no negative mass? [duplicate]

We know that the entire matter has a property called mass. Charge is also a property of matter. If negative charge can exist, why don't negative mass exist? Also, like charges repel each other. Then ...
Srikar Anand Yellapragada's user avatar
4 votes
2 answers
4k views

How likely is negative energy to exist?

Negative Energy is the exact opposite of ordinary energy as it would move in the opposite direction from its momentum and accelerate in the opposite direction of an applied force. It would also warp ...
Anders Gustafson's user avatar
0 votes
1 answer
3k views

What are negative and positive energies? [closed]

So I have a few questions related to the negative and positive energy topic. 1)What do we mean by negative and positive energies in physics? 2)I have seen in a minute physics video that we need ...
Bhavesh's user avatar
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