Questions tagged [exotic-matter]

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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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If mass changes when we go in the speed of light . So it breaks law of matter which states that matter can't be created or destroy [closed]

When go at the speed of light the mass constantly started to change which is not possible if law of matter is correct
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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. ...
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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 ...
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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?
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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 ...
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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 "...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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?
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?...
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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 ...
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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 ...
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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 ...
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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 ...
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Can we find exotic energy from outer space which is several times powerful than nuclear energy?If antimatter how? [closed]

Some thing Like we see in sci fi films
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Dark Energy and Wormhole stability

Is it possible that the "negative energy" needed to create stable wormholes as theorized by Morris and Thorne (?) could be dark energy? Could this be the "exotic" negative energy matter referred to?
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How stable is a tablespoon of neutrons once removed from a neutron star? [duplicate]

I've often heard public lectures describing the degenerate, exotic matter left behind after a star collapses but fails to go supernova; one that has found its way to become a neutron star. The speaker ...
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Travelling through a worm hole

In every documentary I've seen about worm holes, I have noticed that they usually say that according to the General Theory of Relativity, there could exist worm holes called traversable wormholes; ...
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Exotic matter out of a "squeezed" vacuum?

In the light of the current warp field experiments by NASA I found this paper: https://arxiv.org/abs/1005.5682 Could this actually lead to the creation of exotic matter or at least strengthen the case ...
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Motivation for Negative Mass

Lately I've been reading a little bit (mostly here and on Wikipedia) about exotic matter, particularly matter with a negative mass. This question appears to be the original question on the site of the ...
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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 ...
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