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Questions tagged [matter]

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1answer
72 views

Basic energy question

How do we know something contain energy or not? P.S.: I don't really understand how energy should be interpreted. Until today I always thought that energy is some kind of magic that makes stuff ...
4
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2answers
82 views

Physical mechanism by which the body removes weight during long-term human weight loss [duplicate]

I'm trying to confirm the method by which the body physically loses weight during "long-term" weight loss. I'm specifying "long-term" here because obviously there are lots of ways to temporarily lose ...
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0answers
39 views

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}} =...
3
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1answer
198 views

Temperature Required to give Particles of Matter Speed comparable to the speed of light

We know that at 0 K, particles of matter almost stop vibrating/moving completely. Also, as we increase temperature of the system, the particles gain energy (in the ...
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1answer
115 views

Could matter in the universe come from some process other than the decay of inflaton field?

Could matter in the universe come from some process other than the decay of inflaton field? Do we have any theoretical reasons that support the idea that matter was created from the decay of ...
1
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1answer
53 views

Physics of Oil Stains - Why?

You accidentally put an oil stain on your clothes and try to wash it with cold water. Why is it difficult to do? P.S. This question was asked in class by my physics instructor, with a peculiar ...
-2
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1answer
137 views

Do photons apply gravity? [duplicate]

Matter curves space time . as its mass grows the curvature of space-time grows. This curvature procedure of space time is to my opinion what slows down and prevents from mass to reach the speed of ...
2
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1answer
63 views

How do liquid metals work?

So in solid metals they atoms give off electrons, which are delocalised and hold together all the metal atoms. But that's not the case in liquid metals, right? What holds together the individual atoms ...
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0answers
62 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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0answers
40 views

Space expansion and conservation of energy [duplicate]

The phrase of 'expansion of universe' , as we are led to believe, is mostly referring to an expansion in space. But is space expanding in the sense that the space between two particles is increasing ...
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0answers
37 views

How do fabrics become stretchy? [closed]

What makes stretchyness happen? I know it has something to do with the way the threads are sewed together, right?
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2answers
117 views

Can't we stop the time? [duplicate]

Time is called as a measurement of difference between two or more incidents. So if we stop happening incidents can't we stop the TIME? Eventhough it's impractical, I mean if we reduce the temperature ...
3
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1answer
104 views

Baryon asymmetry still going on

I read these questions and answers and it made me curious. Baryon asymmetry Why do we believe baryon asymmetry? Why does matter-antimatter asymmetry only refer to baryon asymmetry? How does ...
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2answers
591 views

What kind of matter are black holes made of?

Imagine a black hole originally formed from, for example, Rubidium atoms. On the other hand, one made from, for example, Helium atoms. Will it be there any difference between the two? Or perhaps once ...
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1answer
45 views

Escaping a Blackhole

On reading hawking radiation, I know that either a matter or an anti-matter is able to escape a black hole, causing it to evaporate away soon. On this thought, I am curious that would it be possible ...
1
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1answer
119 views

How does mass affect the expansion of space?

I'm a layman and I'm curious to understand how mass affects the expansion of space and whether the expansion of space is uniform everywhere in the universe. From looking at redshifts it seems we have ...
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0answers
19 views

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 ...
-2
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1answer
99 views

How can tiny black holes exist? [closed]

If Black Holes are a function of mass being crushed, how can black holes be theoretically formed in particle accelerators?
2
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1answer
46 views

Does energy to matter+antimatter conversion increase the amount of information?

If I am not mistaken; when matter and antimatter annihilate each other and release energy, all the information except the total amount of mass, becomes lost. So, can we say that the reversed process ...
1
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0answers
35 views

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? ...
-2
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1answer
162 views

Difference between a law and a theory [duplicate]

What is the difference between a law and a theory? Some seem to think that a law is a single relationship or a single equation, while a theory is an explanatory framework in which these laws come ...
2
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1answer
88 views

Where is the “Bremsstrahlung” before the annihilation of an electron and a positron?

When an electron and a positron meet, they annihilate each other, converting into two gamma rays. Unless all of them hit in a straight line (very unlikely), they should emit Bremsstrahlung before the ...
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1answer
43 views

Is there scientific evidence that point towards the cause of differently distributed matter through out the Universe? [closed]

If we know from discoveries from cosmology prove that ordinary matter and dark matter are still not enough to explain the structure of the universe and its distribution of matter. There should be a ...
2
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0answers
48 views

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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1answer
54 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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2answers
193 views

If all matter ceased movement, would time still pass? [closed]

I was reading The Black Hole War, by Leonard Susskind, when I came across a section describing the moving and relative bending of time. If time is a property of the movement of all matter in relation ...
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3answers
185 views

Can there be energy without mass?

Is there any Matter identified as being without mass? I have heard that Photon's meet this description.
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0answers
706 views

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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4answers
556 views

Are bosons matter?

The title explains the question. Are bosons matter? As I have seen, there are three answers to this question: No, only fermions are matter. Yes, but only those with mass. Yes, all bosons are matter. ...
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1answer
110 views

If energy and matter are equivalent, is matter low entropy?

$E = mc^2$ tells us that energy and matter are interchangeable, and this lines up with quantum field theory. If that's the case, would that mean that matter is a low entropy form of energy? And to ...
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1answer
186 views

Solving the Friedmann Equation for a specific universe

Suppose instead of the cosmological constant there is a quantum field with equation state parameter $w = -1/2$. Assume also it is a flat universe with only this quantum field ($Q$) and with non ...
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0answers
59 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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2answers
99 views

Do gravitational sources move along ‘geodesics’?

Assume we have a system of say two bodies which are orbiting each other. Now assume that we wish to find an equation of the orbits of the two gravitational sources. Do they follow a ‘geodesical’ path, ...
6
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4answers
423 views

Which one is more fundamental in nature: matter or radiation?

I am following a geometric perspective on abelian gauge theory as done in the lecture notes by Timo Weigand, chapter 6, pp 165-167, here: http://www.thphys.uni-heidelberg.de/~weigand/QFT1-13-14/...
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1answer
97 views

What if the “actual” force to accelerate an object was hypothetically 400 x what it currently is? [closed]

Since f=ma, and we derive whatever the force it takes to accelerate a specific mass at a specific acceleration as a unit of force. I understand this ratio of actual force will always be the same in ...
1
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1answer
493 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 ...
0
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1answer
315 views

Ground state of the Jaynes-Cummings hamiltonian

Equation (5) in beautiful paper (link) on Jaynes-Cummings Hamiltonian gives energy levels $$E_n = n \hbar \omega \pm 2 g \sqrt{n}, \text{ where } n=0, 1, 2, \ldots$$ But eigenstates in Equation (4) ...
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2answers
3k views

Can energy exist without matter? [closed]

Is it theoretically possible that energy will be in space without any matter/antimatter/etc in that space? Is it theoretically possible that space will exist with only energy in it and without ...
-2
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2answers
133 views

Is it possible that in a black hole still is some 'normal' matter?

The singularity is usual the infinite density of pure energy. But if normal matter like protons and electrons falls beyond the event horizon does this háve to turn into this infinite density of pure ...
9
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4answers
3k views

Where does matter go after reaching singularity in uncharged black holes?

I am a layman in physics and just read about black holes on the internet. I read that matter encounters geodesic incompleteness in the singularity in an uncharged black hole. I heard an analogy of ...
24
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3answers
7k views

Is it possible to obtain antiwater from antihydrogen and antioxygen atoms? And how is its property w.r.t. the ordinary water?

I am interested in experimental physics and looking for information about the above question.
0
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1answer
708 views

What would strange and charm matter look like?

Scientists have studied and detected the different types of quark matter over the last decades, from up to strange. While we obviously know how matter composed solely of up and down matter looks like, ...
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1answer
111 views

Black hole's time effect and matter (or energy) position

Ok, so after I've read a few (around 50 :P ) articles on subject of black holes. There are a few gaps in my understanding of it. Please follow my reasoning, I bet there is a mistake in there, and I ...
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3answers
129 views

Dust in Spherically Symmetric Gravitational Potential

How can I describe dust in a spherically symmetric gravitational field? I thought of using Schwarzschild, but then I found out that it is a solution of the Einstein Field Equations in Vacuum.
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2answers
155 views

When an atom is smashed what happens to the subatomic particles created? [closed]

Since in theory matter can't be created or destroyed except through a nuclear reaction, what happens to an atom's subatomic particles when it is smashed?
2
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2answers
120 views

Possible quantum states and eternity [closed]

According to a TED talk by Sean Carroll (about 12' 40" in) if our universe is going to expand forever according the observed expansion rate we have calculated and the possible quantum states for our ...
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1answer
72 views

Age of the first universe according eternal inflation model

In the eternal inflation our universe has the approximate age of 13.7 billion years.the question is; what's the age of the first universe that was made according this theory ?thanks
2
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2answers
261 views

What property (besides charge) of antimatter is different than matter?

There must be a property that is different other than charge. When two oppositely charged matter particles interact, they do not annihilate. I'm told that two neutrally charged matter/antimatter ...
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0answers
158 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 ...
0
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2answers
68 views

Does the same amount of laser energy ablate more material if delivered at higher power?

Consider laser cutting. Will 1 Joule of energy penetrate deeper into material if it is delivered at 100 Watts rather than 50 Watts? Consider alternative: suppose you can to cut up to 6 mm thick PMMA ...