black dwarf stars and dark matterHow can Y-dwarf stars have such a low temperature?Dark Matter 'Stars'Dark matter and black holeDid dark matter cause the formation of the Solar System?Are black holes in a binary system with white holes, and are they both wormholes?Do clouds of dark matter cool and contract?Direct Dark Matter Detection: relative velocity between WIMPs & NucleiWhen and where was WIMP dark matter formed?Overlap between experimental searches for axion and WIMP dark matterWhat is the theoretical lower mass limit for a white dwarf?
How to add power-LED to my small amplifier?
What do you call a Matrix-like slowdown and camera movement effect?
"which" command doesn't work / path of Safari?
How can bays and straits be determined in a procedurally generated map?
A newer friend of my brother's gave him a load of baseball cards that are supposedly extremely valuable. Is this a scam?
Why are only specific transaction types accepted into the mempool?
Banach space and Hilbert space topology
Possibly bubble sort algorithm
Is it possible to make sharp wind that can cut stuff from afar?
Email Account under attack (really) - anything I can do?
Chess with symmetric move-square
What do you call something that goes against the spirit of the law, but is legal when interpreting the law to the letter?
What makes Graph invariants so useful/important?
Could a US political party gain complete control over the government by removing checks & balances?
Japan - Plan around max visa duration
Why don't electron-positron collisions release infinite energy?
Is there a familial term for apples and pears?
black dwarf stars and dark matter
The use of multiple foreign keys on same column in SQL Server
What Brexit solution does the DUP want?
Why was the small council so happy for Tyrion to become the Master of Coin?
How old can references or sources in a thesis be?
Why did the Germans forbid the possession of pet pigeons in Rostov-on-Don in 1941?
whey we use polarized capacitor?
black dwarf stars and dark matter
How can Y-dwarf stars have such a low temperature?Dark Matter 'Stars'Dark matter and black holeDid dark matter cause the formation of the Solar System?Are black holes in a binary system with white holes, and are they both wormholes?Do clouds of dark matter cool and contract?Direct Dark Matter Detection: relative velocity between WIMPs & NucleiWhen and where was WIMP dark matter formed?Overlap between experimental searches for axion and WIMP dark matterWhat is the theoretical lower mass limit for a white dwarf?
$begingroup$
Today we understand that a black dwarf star represents a hypothetical star that is the result of the complete consumption of the energy of a white dwarf which is the remnant of a star of little or half mass (1 solar mass), once all its hydrogen has been consumed or expelled. This rest is a dense piece of "degenerated matter" that slowly cools and crystallizes by emission of heat radiation. So, if these objects (not yet observed) do not emit light but interact gravitationally with the surrounding matter, we can not say that dark matter may be black dwarf stars that are contained within the galactic halo? To discard weak interaction particles such as WIMP's or its opposite, the MACHO's ("massive compact halo objects")
astrophysics astronomy dark-matter stars wimps
asked 4 hours ago
jormansandovaljormansandoval
918719
$endgroup$
add a comment |
$begingroup$
Today we understand that a black dwarf star represents a hypothetical star that is the result of the complete consumption of the energy of a white dwarf which is the remnant of a star of little or half mass (1 solar mass), once all its hydrogen has been consumed or expelled. This rest is a dense piece of "degenerated matter" that slowly cools and crystallizes by emission of heat radiation. So, if these objects (not yet observed) do not emit light but interact gravitationally with the surrounding matter, we can not say that dark matter may be black dwarf stars that are contained within the galactic halo? To discard weak interaction particles such as WIMP's or its opposite, the MACHO's ("massive compact halo objects")
astrophysics astronomy dark-matter stars wimps
asked 4 hours ago
jormansandovaljormansandoval
918719
$endgroup$
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago
add a comment |
$begingroup$
Today we understand that a black dwarf star represents a hypothetical star that is the result of the complete consumption of the energy of a white dwarf which is the remnant of a star of little or half mass (1 solar mass), once all its hydrogen has been consumed or expelled. This rest is a dense piece of "degenerated matter" that slowly cools and crystallizes by emission of heat radiation. So, if these objects (not yet observed) do not emit light but interact gravitationally with the surrounding matter, we can not say that dark matter may be black dwarf stars that are contained within the galactic halo? To discard weak interaction particles such as WIMP's or its opposite, the MACHO's ("massive compact halo objects")
astrophysics astronomy dark-matter stars wimps
asked 4 hours ago
jormansandovaljormansandoval
918719
$endgroup$
Today we understand that a black dwarf star represents a hypothetical star that is the result of the complete consumption of the energy of a white dwarf which is the remnant of a star of little or half mass (1 solar mass), once all its hydrogen has been consumed or expelled. This rest is a dense piece of "degenerated matter" that slowly cools and crystallizes by emission of heat radiation. So, if these objects (not yet observed) do not emit light but interact gravitationally with the surrounding matter, we can not say that dark matter may be black dwarf stars that are contained within the galactic halo? To discard weak interaction particles such as WIMP's or its opposite, the MACHO's ("massive compact halo objects")
astrophysics astronomy dark-matter stars wimps
astrophysics astronomy dark-matter stars wimps
asked 4 hours ago
jormansandovaljormansandoval
918719
asked 4 hours ago
jormansandovaljormansandoval
918719
asked 4 hours ago
jormansandovaljormansandoval
918719
asked 4 hours ago
jormansandovaljormansandoval
918719
asked 4 hours ago
jormansandovaljormansandoval
918719
918719
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago
add a comment |
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
Three reasons:
As you correctly point out, black dwarfs are "hypothetical objects". There has been insufficient time since the first stars were born for white dwarfs to cool below about 3000 K. i.e. Whilst there are faint white dwarfs with luminosities below a few $10^-5 L_odot$, they are not invisible.
Microlensing experiments rule out "massive compact halo objects", like cold white dwarfs or black holes as a significant contributor to dark matter.
Most of the dark matter needs to be non baryonic and to interact very weakly with normal matter in order to form the structures that we see today in the universe; and to reconcile the inferred primordial abundances of helium, deuterium and lithium with the total amount of matter deduced to be in galaxies and clusters of galaxies. Cold white dwarfs are baryonic, so cannot represent the bulk of dark matter.
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
);
);
, "mathjax-editing");
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%2f471183%2fblack-dwarf-stars-and-dark-matter%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Three reasons:
As you correctly point out, black dwarfs are "hypothetical objects". There has been insufficient time since the first stars were born for white dwarfs to cool below about 3000 K. i.e. Whilst there are faint white dwarfs with luminosities below a few $10^-5 L_odot$, they are not invisible.
Microlensing experiments rule out "massive compact halo objects", like cold white dwarfs or black holes as a significant contributor to dark matter.
Most of the dark matter needs to be non baryonic and to interact very weakly with normal matter in order to form the structures that we see today in the universe; and to reconcile the inferred primordial abundances of helium, deuterium and lithium with the total amount of matter deduced to be in galaxies and clusters of galaxies. Cold white dwarfs are baryonic, so cannot represent the bulk of dark matter.
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
$endgroup$
add a comment |
$begingroup$
Three reasons:
As you correctly point out, black dwarfs are "hypothetical objects". There has been insufficient time since the first stars were born for white dwarfs to cool below about 3000 K. i.e. Whilst there are faint white dwarfs with luminosities below a few $10^-5 L_odot$, they are not invisible.
Microlensing experiments rule out "massive compact halo objects", like cold white dwarfs or black holes as a significant contributor to dark matter.
Most of the dark matter needs to be non baryonic and to interact very weakly with normal matter in order to form the structures that we see today in the universe; and to reconcile the inferred primordial abundances of helium, deuterium and lithium with the total amount of matter deduced to be in galaxies and clusters of galaxies. Cold white dwarfs are baryonic, so cannot represent the bulk of dark matter.
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
$endgroup$
add a comment |
$begingroup$
Three reasons:
As you correctly point out, black dwarfs are "hypothetical objects". There has been insufficient time since the first stars were born for white dwarfs to cool below about 3000 K. i.e. Whilst there are faint white dwarfs with luminosities below a few $10^-5 L_odot$, they are not invisible.
Microlensing experiments rule out "massive compact halo objects", like cold white dwarfs or black holes as a significant contributor to dark matter.
Most of the dark matter needs to be non baryonic and to interact very weakly with normal matter in order to form the structures that we see today in the universe; and to reconcile the inferred primordial abundances of helium, deuterium and lithium with the total amount of matter deduced to be in galaxies and clusters of galaxies. Cold white dwarfs are baryonic, so cannot represent the bulk of dark matter.
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
$endgroup$
Three reasons:
As you correctly point out, black dwarfs are "hypothetical objects". There has been insufficient time since the first stars were born for white dwarfs to cool below about 3000 K. i.e. Whilst there are faint white dwarfs with luminosities below a few $10^-5 L_odot$, they are not invisible.
Microlensing experiments rule out "massive compact halo objects", like cold white dwarfs or black holes as a significant contributor to dark matter.
Most of the dark matter needs to be non baryonic and to interact very weakly with normal matter in order to form the structures that we see today in the universe; and to reconcile the inferred primordial abundances of helium, deuterium and lithium with the total amount of matter deduced to be in galaxies and clusters of galaxies. Cold white dwarfs are baryonic, so cannot represent the bulk of dark matter.
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
answered 4 hours ago
Rob JeffriesRob Jeffries
70.3k7142243
70.3k7142243
add a comment |
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%2f471183%2fblack-dwarf-stars-and-dark-matter%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
$begingroup$
I'm pretty sure the "degenerated matter" of the black dwarf is still made of baryons, so it is not dark matter.
$endgroup$
– N. Steinle
4 hours ago