Questions tagged [matter]

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204 views

How can a negative strangelet convert matter in strange matter?

How can a strangelet convert matter into strange matter? Because strange quarks are heavier than up and down quarks wouldn't you loose energy by converting regular matter into strange matter? And are ...
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536 views

Richard Feynman - QED: The Strange Theory of Matter and Light

After reading the book QED: The Strange Theory of Light and Matter, an adaptation of four lectures Richard Feynman gave at the University of Auckland, I gained a greater understanding of QED. I am not ...
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3answers
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Why is there matter when all of it should have annihilated with antimatter?

The theory is that after the Big Bang, photons turned into matter and antimatter particle pairs, but they should have all annihilated with each other. Since there would be an equal amount of matter ...
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What is the critical volume/mass of non-deuterated water that appears blue to our eyes?

A glass of water appears clear, but a swimming pool appears blue. At some point there must be a switch and I am wondering if anyone knows what that point is (or if its so gradual we can't tell). Does ...
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1answer
73 views

contradiction between total photon energy in the universe and early matter antimatter ratio

When looking at the energy count in the Universe, on one hand we are told dark energy 68%, dark matter 27%, regular matter 5%, neutrinos and photons a very small fraction (trace like). https://en....
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Is space not truly an empty vacuum but instead made up of densely packed particles of matter and antimatter?

In the livescience.com article Superpowered Chinese Lasers Could Soon Rip Open Raw Vacuum I read that quantum electrodynamics states that the vacuum of space isn't empty, rather it's made of densely ...
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25 views

What can we expect to observe if we were able to observe de Broglie wavelength of massive bodies?

I have seen the famous question where they ask us calculate the de Broglie wavelength of a moving ball but it comes out to be too small and hence we conclude that it is too small to measure by known ...
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Why don't matter bosons, like any non-ionized atoms with even numbers of protons and neutrons, fall through each other like ghosts?

Obviously, two chunks of pure Iron-56 won't pass through each other like photons go right through each other... Why is that?
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1answer
52 views

Are energy and momentum imposed by purely geometrical properties of spacetime?

If we defined spacetime as a purely geometrical (not physical) structure of the kind that is in general relativity (a 4-dimensional Lorentzian manifold), would it automatically have properties that ...
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41 views

What would happen if our galaxy and an identical anti-matter galaxy annihilated each other?

What would happen if every bit of matter in our galaxy annihilated with an anti-matter equivalent at the same time? Such as that stars completely annihilated with identical antimatter stars, planets ...
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De-Broglie Wavelength and the Pilot Wave Theory

I researched a lot of questions on De-Broglie waves on this website and discovered a dense fog of confusion amongst everyone. Louis De-Broglie proposed "Matter Waves" and a simple equation describing ...
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1answer
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What is the minimum amount of matter do I need to call it “bulk” matter?

I had been reading about bulk properties, but was confused what should the minimum amount of matter be for these properties to hold. For eg: Intensive thermodynamic variables will not remain ...
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100 views

Does dark-matter attract itself with gravity as light-matter does, and if so where are the dark stars and galaxies?

Does dark-matter interact with gravity like light-matter does, or does dark matter interact only with light-matter via gravity?
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Acceleration from scalar-matter coupling in classical field theory

I have came across a text where an interaction term in a classical Lagrangian is presented that couples a matter density $\rho$ and a scalar field $\phi$ as \begin{equation} \mathcal{L}_{\text{int}} =...
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69 views

If matter cannot be transformed into information, why do we say that information about matter is lost when we talk about black hole paradox?

In this question it is said that matter cannot be transformed into information: Can matter be converted to information? But when we talk about black hole information paradox, we say that matter ...
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Can strongly radiating matter cause dark matter to clump?

Ordinary matter clumps under gravitational attraction only when it loses energy through radiation. Dark matter supposedly doesn't clump since it can only exchange energy with itself and ordinary ...
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How were the particles created from the vacuum state, in the beginning of the universe?

How were the particles created from the vacuum state, in the beginning of the universe? If the particles are created when some energy is supplied to vacuum state, then how were particles created? ...
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1answer
55 views

Would “gravity” and the “law of gravity” have a meaning in a universe without matter?

I was discussing the fact that if there was no matter in the universe, just vacuum and radiation, can we say that anything called gravity wouldn't exist? In that universe, the Friedman equations ...
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122 views

How do trace element abundances show that dark matter exists in both baryonic and non - baryonic forms?

I can't seem to find an answer to this question anywhere, any help would be greatly appreciated. Thanks in advance.
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126 views

Dirac representation between matter and anti-matter

If $|\psi \rangle$ represents a wavefunction through a column matrix and $\langle \psi |$ represents the dual vector in a row matrix and $|\psi \rangle \langle \psi | = \rho $ is the probability ...
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71 views

Is the Accretion Disk of a Black Hole just an illusion?

As a matter of fact, I recently learnt that as an object is approaching a black hole, to an outside observer the object seems to be getting slower and slower and will cross the event horizon after an ...
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1answer
603 views

Lagrangian density for classical electrodynamics in matter

I've been unable to find any references for the lagrangian density in presence of matter. It's a lot easier to find this expressions in vacuum, but, when it comes to matter, I couldn't find any clear ...
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2answers
40 views

Can we add matter and antimatter to the universe?

Sorry if this is a basic question, or there is a glaringly large hole in my reasoning, I am not smart, and saw a documentary and did some googling, after which I decided to ask people with actual ...
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How does matter and energy exist in a block universe?

If we suppose that the block universe is indeed true, and that the past, present and future exist simultaneously, then what happens to matter and energy? If matter and energy cannot be created nor ...
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24 views

Could antimatter have disapeared from the universe simmilarly as observed matter from collisions of black holes?

As matter inside a neutron star or black hole can vanish through collisions could be possible that antimatter did so more than matter in the very beginning of the universe through a high energetic ...
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“Solids have distinct boundaries” meaning

That may sound very silly questions but believe me I'm unable to understand that . I'm unable to visualise how solid can be said to have distinct boundaries . Please help me so I can make the picture ...
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Given a random distribution of matter in the universe, what's the frequency of permutations of ordered matter?

I know matter isn't purely randomly distributed since it clumps together from various forces acting on it constantly, but I just want to discuss randomly distributed matter. Unless, there is a way to ...
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When Matter condensed — the condenser

Did gluons, quarks, and electrons first appear at the same age of the universe or was one first?
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Magnetoelectric effect

I am trying to find a concise and clear paper/book/reference in which there is a proof of the fact that any chiral molecule shows magnetoelectric effect. Could someone help please?
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19 views

Are all of the objects that composed the Bose-Einstein condensates absolutely can't be distinguished from each other?

Are all of the objects (e.g. photons or bosons) that composed Bose-Einstein condensates (BECs) literally can't be distinguished from each other? It was said several times on the Internet and many ...
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35 views

Incorporating matter effects on active-sterile neutrino oscillation with mathematica

I recently wanted to study the effect of a constant matter potential on a simple 2-flavor active-sterile neutrino oscillation system using Wolfram Mathematica, but I encountered a big problem in the ...
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1answer
67 views

What if there was no baryon-antibaryon asymmetry in our universe?

We know that the universe goes through different evolutionary phases: radiation, matter and later dark energy epoch. What would happen if there was no baryon-antibaryon asymmetry? How would the ...
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Matter Standing Waves means 0 probability?

de Broglie standing waves are waves that represent the probability of finding an electron somewhere. In an atom, these waves must become standing waves in order to ensure that no destructive ...
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2answers
37 views

What happens if matter particle and antimatter particle both carry no charge were to collide elastically?

I read that particle carrying charge is able to interact with photon so that when electron and positron collides they may be converted into pure photons, then what about neutron-antineutron collision? ...
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1answer
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Neutrino oscillation in earths matter: electron-, proton- and neutron density

I want to incorporate an estimate of a matter effect in atmospheric neutrino oscillations into a model including active and sterile neutrinos. Since neutrinos are not only created in the atmosphere ...
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Clarification on Phase wave derivation in De Broglie's paper

De Broglie's paper refers to his theorem A periodic phenomenon is seen by a stationary observer to exhibit the frequency $ν_1=h^{-1}m_0c^2\sqrt{1-\beta^2}$ that appears constantly in phase ...
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What exactly is Excitonium matter?

After 50 years of theories and thwarted attempts, scientists have finally proved the existence of a new form of matter. The never-before-detected condensate is called excitonium, a name first coined ...
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68 views

Why the rate of Z boson decays produce 3 generations of matter?

I read a tons of article about Z boson, I know it is a carrier of weak force similar to photon except it is much much more massive than an electron and it is extremely short lived. Sadly almost all ...
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161 views

Liquification of gas

During the process of liquification of gas the volume of gas suddenly decreases in the region BC. what happens in the gas which causes such an abrupt change in its volume at a constant pressure?
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Does the knowledge of a material's atomic structure provide sufficient data to predict its behavior with matter?

What are the properties of a material on an atomic point of view that define its behavior? The whole world around us consists of atoms of varying numbers of electrons, protons and neutrons. Suppose ...
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364 views

Does the analogous saying: “matter is essentially 'condensed' energy” have any merit?

Einstein in his derivation of special relativity came upon the equivalence of energy and matter, and given the right circumstances, the relation can go either way - matter can become energy, and ...
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Do stress and strain contradict each other?

According to the book Engineering Physics by R.K Gaur and S.L Gupta Strain: Strain is a fractional deformation produced in the body when it is subjected to set of deforming forces. Stress: The ...
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Asymmetry vs. Simple Statistics WRT Matter / Antimatter Ratios

I'm not clear on why physicists suspect, and are looking for, an asymmetry in nature that favors matter over antimatter. Here's a simple thought experiment to illustrate my confusion: Assume I have ...