Can I feed enough spin up electrons to a black hole to affect its angular momentum?How can a particle with no size have angular momentum?Why can't I just think the spin as rotating?What the quantum spin refers to? How we calculate the angular momentum $omega$ from the spin quantum number?What is the significance of electron spin quantum number?What's is the origin of Orbital Angular Momentum of electrons in atoms?How does the Gordon Decomposition of Dirac Current give rise to spin angular momentum?Orbital angular momentum of electronsWhat all has intrinsic spin?Relationship Between Magnetic Dipole Moment and Spin Angular MomentumWhat is the angular momentum of an electron? And how can it be zero?
Is this homebrew race based on the Draco Volans lizard species balanced?
Can commander tax be proliferated?
How did Captain America use this power?
Stark VS Thanos
Pressure to defend the relevance of one's area of mathematics
How to efficiently calculate prefix sum of frequencies of characters in a string?
When do aircrafts become solarcrafts?
Any examples of headwear for races with animal ears?
Was Unix ever a single-user OS?
Loading but not using TikZ changes a file
Accidentally deleted the "/usr/share" folder
Visa for volunteering in England
Short story about people living in a different time streams
Why are notes ordered like they are on a piano?
Copy line and insert it in a new position with sed or awk
Floor tile layout process?
What happens if I start too many background jobs?
Does hiding behind 5-ft-wide cover give full cover?
Selecting a secure PIN for building access
Shoteh in the gemara
Change active object through scripting
Visualizing a complicated Region
Geometry - Proving a common centroid.
You look catfish vs You look like a catfish?
Can I feed enough spin up electrons to a black hole to affect its angular momentum?
How can a particle with no size have angular momentum?Why can't I just think the spin as rotating?What the quantum spin refers to? How we calculate the angular momentum $omega$ from the spin quantum number?What is the significance of electron spin quantum number?What's is the origin of Orbital Angular Momentum of electrons in atoms?How does the Gordon Decomposition of Dirac Current give rise to spin angular momentum?Orbital angular momentum of electronsWhat all has intrinsic spin?Relationship Between Magnetic Dipole Moment and Spin Angular MomentumWhat is the angular momentum of an electron? And how can it be zero?
$begingroup$
I was reading classical spin vs quantum field spin. I know spin in quantum mechanics is just a quantum number. But what happens if I try to intentionally feed many electrons all in the same spin state into a rotating 5 solar mass blackhole? Can I affect its angular momentum eventually?
black-holes angular-momentum electrons conservation-laws quantum-spin
edited Apr 23 at 20:35
Jens
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
$endgroup$
add a comment |
$begingroup$
I was reading classical spin vs quantum field spin. I know spin in quantum mechanics is just a quantum number. But what happens if I try to intentionally feed many electrons all in the same spin state into a rotating 5 solar mass blackhole? Can I affect its angular momentum eventually?
black-holes angular-momentum electrons conservation-laws quantum-spin
edited Apr 23 at 20:35
Jens
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
$endgroup$
add a comment |
$begingroup$
I was reading classical spin vs quantum field spin. I know spin in quantum mechanics is just a quantum number. But what happens if I try to intentionally feed many electrons all in the same spin state into a rotating 5 solar mass blackhole? Can I affect its angular momentum eventually?
black-holes angular-momentum electrons conservation-laws quantum-spin
edited Apr 23 at 20:35
Jens
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
$endgroup$
I was reading classical spin vs quantum field spin. I know spin in quantum mechanics is just a quantum number. But what happens if I try to intentionally feed many electrons all in the same spin state into a rotating 5 solar mass blackhole? Can I affect its angular momentum eventually?
black-holes angular-momentum electrons conservation-laws quantum-spin
black-holes angular-momentum electrons conservation-laws quantum-spin
edited Apr 23 at 20:35
Jens
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
edited Apr 23 at 20:35
Jens
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
edited Apr 23 at 20:35
Jens
2,44811632
edited Apr 23 at 20:35
Jens
2,44811632
edited Apr 23 at 20:35
Jens
2,44811632
2,44811632
asked Apr 22 at 10:45
user6760user6760
3,16612145
asked Apr 22 at 10:45
user6760user6760
3,16612145
asked Apr 22 at 10:45
user6760user6760
3,16612145
3,16612145
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
I infer that you are asking whether spin angular momentum can accumulate to a macroscopically significant amount.
It is generally claimed that spin angular momentum does not have a classical counterpart. So maybe there is no connection with macroscopic angular momentum at all? In fact, there is a connection with macroscopic angular momentum, which is vividly demonstrated by an effect called the 'Einstein-De Haas effect'. I'll get to that in a second.
About the black hole in your thought experiment: my guess is that you added that element to the picture because nothing escapes a black hole. That is, the fact that the electrons enter a black hole ensures that it is a one way trip.
Check out this youtube video titled Einstein De Haas effect, uploaded by the University of Michigan Demo lab
The demo shows a torsion pendulum.
The amplitude of the swing is back and forth around a vertical axis. The amplitude of the swing increases because the swing is pumped. The current in the surrounding coil is reversed in resonance with the natural frequency of the torsion pendulum. The Einstein De Haas effect is very small, the resonance setup accumulates the effect to a significant amplitude.
The particular metal in the setup, presumably iron, has a significant population of electrons with a spin that can be reoriented by an external magnetic field. Every time the current is reversed the direction of the magnetic field is reversed, and the alignable electrons realign. But angular momentum cannot change, so the electrons must exchange angular momentum with external mass.
I find the Einstein De Haas effect fascinating: you get to see a quantum effect accumulate to a level where you see a physical consequence with the unaided eye.
answered Apr 22 at 11:45
CleonisCleonis
2,446714
$endgroup$
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
add a comment |
$begingroup$
A single electron will already alter the angular momentum of a black hole by exactly $hbar/2$.
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
$endgroup$
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "151"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f474317%2fcan-i-feed-enough-spin-up-electrons-to-a-black-hole-to-affect-its-angular-moment%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
I infer that you are asking whether spin angular momentum can accumulate to a macroscopically significant amount.
It is generally claimed that spin angular momentum does not have a classical counterpart. So maybe there is no connection with macroscopic angular momentum at all? In fact, there is a connection with macroscopic angular momentum, which is vividly demonstrated by an effect called the 'Einstein-De Haas effect'. I'll get to that in a second.
About the black hole in your thought experiment: my guess is that you added that element to the picture because nothing escapes a black hole. That is, the fact that the electrons enter a black hole ensures that it is a one way trip.
Check out this youtube video titled Einstein De Haas effect, uploaded by the University of Michigan Demo lab
The demo shows a torsion pendulum.
The amplitude of the swing is back and forth around a vertical axis. The amplitude of the swing increases because the swing is pumped. The current in the surrounding coil is reversed in resonance with the natural frequency of the torsion pendulum. The Einstein De Haas effect is very small, the resonance setup accumulates the effect to a significant amplitude.
The particular metal in the setup, presumably iron, has a significant population of electrons with a spin that can be reoriented by an external magnetic field. Every time the current is reversed the direction of the magnetic field is reversed, and the alignable electrons realign. But angular momentum cannot change, so the electrons must exchange angular momentum with external mass.
I find the Einstein De Haas effect fascinating: you get to see a quantum effect accumulate to a level where you see a physical consequence with the unaided eye.
answered Apr 22 at 11:45
CleonisCleonis
2,446714
$endgroup$
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
add a comment |
$begingroup$
I infer that you are asking whether spin angular momentum can accumulate to a macroscopically significant amount.
It is generally claimed that spin angular momentum does not have a classical counterpart. So maybe there is no connection with macroscopic angular momentum at all? In fact, there is a connection with macroscopic angular momentum, which is vividly demonstrated by an effect called the 'Einstein-De Haas effect'. I'll get to that in a second.
About the black hole in your thought experiment: my guess is that you added that element to the picture because nothing escapes a black hole. That is, the fact that the electrons enter a black hole ensures that it is a one way trip.
Check out this youtube video titled Einstein De Haas effect, uploaded by the University of Michigan Demo lab
The demo shows a torsion pendulum.
The amplitude of the swing is back and forth around a vertical axis. The amplitude of the swing increases because the swing is pumped. The current in the surrounding coil is reversed in resonance with the natural frequency of the torsion pendulum. The Einstein De Haas effect is very small, the resonance setup accumulates the effect to a significant amplitude.
The particular metal in the setup, presumably iron, has a significant population of electrons with a spin that can be reoriented by an external magnetic field. Every time the current is reversed the direction of the magnetic field is reversed, and the alignable electrons realign. But angular momentum cannot change, so the electrons must exchange angular momentum with external mass.
I find the Einstein De Haas effect fascinating: you get to see a quantum effect accumulate to a level where you see a physical consequence with the unaided eye.
answered Apr 22 at 11:45
CleonisCleonis
2,446714
$endgroup$
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
add a comment |
$begingroup$
I infer that you are asking whether spin angular momentum can accumulate to a macroscopically significant amount.
It is generally claimed that spin angular momentum does not have a classical counterpart. So maybe there is no connection with macroscopic angular momentum at all? In fact, there is a connection with macroscopic angular momentum, which is vividly demonstrated by an effect called the 'Einstein-De Haas effect'. I'll get to that in a second.
About the black hole in your thought experiment: my guess is that you added that element to the picture because nothing escapes a black hole. That is, the fact that the electrons enter a black hole ensures that it is a one way trip.
Check out this youtube video titled Einstein De Haas effect, uploaded by the University of Michigan Demo lab
The demo shows a torsion pendulum.
The amplitude of the swing is back and forth around a vertical axis. The amplitude of the swing increases because the swing is pumped. The current in the surrounding coil is reversed in resonance with the natural frequency of the torsion pendulum. The Einstein De Haas effect is very small, the resonance setup accumulates the effect to a significant amplitude.
The particular metal in the setup, presumably iron, has a significant population of electrons with a spin that can be reoriented by an external magnetic field. Every time the current is reversed the direction of the magnetic field is reversed, and the alignable electrons realign. But angular momentum cannot change, so the electrons must exchange angular momentum with external mass.
I find the Einstein De Haas effect fascinating: you get to see a quantum effect accumulate to a level where you see a physical consequence with the unaided eye.
answered Apr 22 at 11:45
CleonisCleonis
2,446714
$endgroup$
I infer that you are asking whether spin angular momentum can accumulate to a macroscopically significant amount.
It is generally claimed that spin angular momentum does not have a classical counterpart. So maybe there is no connection with macroscopic angular momentum at all? In fact, there is a connection with macroscopic angular momentum, which is vividly demonstrated by an effect called the 'Einstein-De Haas effect'. I'll get to that in a second.
About the black hole in your thought experiment: my guess is that you added that element to the picture because nothing escapes a black hole. That is, the fact that the electrons enter a black hole ensures that it is a one way trip.
Check out this youtube video titled Einstein De Haas effect, uploaded by the University of Michigan Demo lab
The demo shows a torsion pendulum.
The amplitude of the swing is back and forth around a vertical axis. The amplitude of the swing increases because the swing is pumped. The current in the surrounding coil is reversed in resonance with the natural frequency of the torsion pendulum. The Einstein De Haas effect is very small, the resonance setup accumulates the effect to a significant amplitude.
The particular metal in the setup, presumably iron, has a significant population of electrons with a spin that can be reoriented by an external magnetic field. Every time the current is reversed the direction of the magnetic field is reversed, and the alignable electrons realign. But angular momentum cannot change, so the electrons must exchange angular momentum with external mass.
I find the Einstein De Haas effect fascinating: you get to see a quantum effect accumulate to a level where you see a physical consequence with the unaided eye.
answered Apr 22 at 11:45
CleonisCleonis
2,446714
edited Apr 22 at 14:17
answered Apr 22 at 11:45
CleonisCleonis
2,446714
answered Apr 22 at 11:45
CleonisCleonis
2,446714
answered Apr 22 at 11:45
CleonisCleonis
2,446714
2,446714
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
add a comment |
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
$begingroup$
there's something about adding "Einstein" to a name that seems to double its coolness to me... "Einstein Rosen Bridge" ... "Bose Einstein Condensate" ... Einstein-De Haas Effect" ...
$endgroup$
– Michael
Apr 22 at 19:07
add a comment |
$begingroup$
A single electron will already alter the angular momentum of a black hole by exactly $hbar/2$.
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
$endgroup$
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
add a comment |
$begingroup$
A single electron will already alter the angular momentum of a black hole by exactly $hbar/2$.
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
$endgroup$
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
add a comment |
$begingroup$
A single electron will already alter the angular momentum of a black hole by exactly $hbar/2$.
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
$endgroup$
A single electron will already alter the angular momentum of a black hole by exactly $hbar/2$.
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
edited Apr 22 at 12:49
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
answered Apr 22 at 10:58
my2ctsmy2cts
6,1032721
6,1032721
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
add a comment |
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
$begingroup$
This is not given unless measured, because QM and GR don't play well together. And surely you can't measure such a small change.
$endgroup$
– safesphere
Apr 23 at 4:03
add a comment |
Thanks for contributing an answer to Physics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f474317%2fcan-i-feed-enough-spin-up-electrons-to-a-black-hole-to-affect-its-angular-moment%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
