Questions tagged [matter]
The matter tag has no usage guidance.
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1answer
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Are particles an abstraction of energy, or their matters do indeed exist?
I'm trying to understand from where the first particles in quantum mechanics came from, and while doing research I got this information from an article about the origin of matter:
In the beginning,...
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1answer
28 views
Probability of Photoelectric and Campton decrease as photon energy increases, WHY? [on hold]
Why Probability of Photoelectric and Campton decrease as photon energy increases??
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1answer
67 views
What happen if an electron meets another electron? [duplicate]
A person give me an idea for my physical problem, and I think the answer of this question would be the next step for its answer
I only want to know what they are doing with each other if they meet ...
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1answer
69 views
If energy can't order itself, how did energy get ordered or made? [duplicate]
In the universe we see that hydrogen (bound up energy) is found in a highly concentrated ordered state in some places and it's highly dispersed in most other places. There is a natural progression ...
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2answers
27 views
What decides ductility of a substance- youngs modulus or the plastic limit of the substance? [closed]
Given two materials A and B such that a has higher young modulus as well as plastic
limit than B , which of the two is more ductile?
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2answers
65 views
Are matter and energy dependent on each other? [closed]
If matter creates energy and energy creates matter can one exist without the other?
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0answers
37 views
Matter Anti-matter Imbalance
If both matter and antimatter could still 'pouring out', why do we assume that there is an overall Matter Anti-matter Imbalance? Could not antimatter possibly come out during a different time as ...
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2answers
78 views
How can 0-dimensional particles or 1-dimensional strings be 3D matter? [closed]
According to the latest information we got
String theory is a theoretical framework in which the point-like
particles of particle physics are replaced by one-dimensional objects
called strings....
1
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1answer
43 views
Working with Reciprocial Lattice
In solid matter physics the lattice structure can equivalently be described via standard Bravais modelling but also by considering it's reciprocial lattice. Mathematically the reciprocial lattice can ...
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2answers
70 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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0answers
10 views
Is visible light-matter-energy a constant quantity, and is dark-matter-energy proportional to space-volume?
Since light-matter and dark-matter interact via gravity but do not collide; do they have different relationships to space: ie that light-matter quantity is independent of space-volume while dark-...
0
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1answer
51 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
68 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
31 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
181 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
96 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
39 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 ...
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1answer
72 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
39 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
47 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
36 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
34 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
83 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
81 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 ...
2
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2answers
269 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 ...
0
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1answer
36 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
88 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
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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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0answers
99 views
Why does it even need a matter / antimatter asymmetry? (No mixed visible universe) [duplicate]
Summary: Why can't the missing antimatter simply be outside the observable universe?
Always when I hear about the big bang mystery why there is only matter left, it is said that there needs to have ...
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1answer
84 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
43 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 ...
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0answers
31 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?
...
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1answer
126 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
71 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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0answers
20 views
Does inelastic scattering dominate elastic scattering in real metals at room temperature?
Does inelastic scattering dominate elastic scattering in real metals at room temperature?
Is it safe to assume the the elastic relaxation time is much larger than the inelastic when using Sommerfeld ...
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1answer
42 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
35 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
130 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
120 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
695 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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3answers
255 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.
...
1
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1answer
73 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
101 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
36 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
70 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, ...
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4answers
392 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
80 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 ...
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1answer
301 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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1answer
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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) ...
