| Topic: |
Science > Physics |
| User: |
"Sanny" |
| Date: |
07 Jan 2008 12:03:20 PM |
| Object: |
Anti Matter Properties |
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
5. Animatter Repels Mass or is Attracted by Gravity?
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Bye
Sanny
Play Chess at: http://www.GetClub.com/Chess.html
.
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| User: "Hagar" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 02:26:25 PM |
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"Sanny" <softtanks@hotmail.com> wrote in message
news:7bda133b-795a-4680-ab0f-9eef888da4ea@s19g2000prg.googlegroups.com...
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
5. Animatter Repels Mass or is Attracted by Gravity?
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Bye
Sanny
Play Chess at: http://www.GetClub.com/Chess.html
Supposedly, right after the Big Bang there were 1,000,000 particles of
anti-matter for every 1,000,001 particles of matter. When the two were
finished annihilating each other, the 1 part per million of matter remained,
which is the Universe, as we see it today. Perhaps the leftovers of the
epic annihilation, which must have been the mother of all fireworks, are
what we think is Dark Matter. There is no natural anti-matter left in the
Cosmos, but it can be created in a lab.
.
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| User: "Golden Boar" |
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| Title: Re: Anti Matter Properties |
10 Jan 2008 05:16:25 PM |
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On 7 Jan, 20:26, "Hagar" <ha...@sahm.name> wrote:
"Sanny" <softta...@hotmail.com> wrote in message
news:7bda133b-795a-4680-ab0f-9eef888da4ea@s19g2000prg.googlegroups.com...
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
5. Animatter Repels Mass or is Attracted by Gravity?
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Bye
Sanny
Play Chess at:http://www.GetClub.com/Chess.html
Supposedly, right after the Big Bang there were 1,000,000 particles of
anti-matter for every 1,000,001 particles of matter. =A0When the two were
finished annihilating each other, the 1 part per million of matter remaine=
d,
which is the Universe, as we see it today. =A0Perhaps the leftovers of the=
epic annihilation, which must have been the mother of all fireworks, are
what we think is Dark Matter. =A0There is no natural anti-matter left in t=
he
Cosmos, but it can be created in a lab.- Hide quoted text -
- Show quoted text -
This is not necessarily true, and the absence of antimatter in the
universe is just a consequence of the definitions of matter and
antimatter.
How is matter defined?
How is antimatter defined?
If we class all negatively charged particles as antimatter and all
positively charged particles as matter, then a hydrogen atom would
consist of 2 particles of matter(2 up quarks) and 2 particles of
antimatter(down quark and electron).
Taking this definition to be true, then you can easily see that there
is no missing antimatter, and that there is a third type of matter,
neutral matter(the neutrino) which has no electric charge.
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| User: "Wordsmith" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 03:13:30 PM |
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On Jan 7, 1:26=A0pm, "Hagar" <ha...@sahm.name> wrote:
"Sanny" <softta...@hotmail.com> wrote in message
news:7bda133b-795a-4680-ab0f-9eef888da4ea@s19g2000prg.googlegroups.com...
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
5. Animatter Repels Mass or is Attracted by Gravity?
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Bye
Sanny
Play Chess at:http://www.GetClub.com/Chess.html
Supposedly, right after the Big Bang there were 1,000,000 particles of
anti-matter for every 1,000,001 particles of matter. =A0When the two were
finished annihilating each other, the 1 part per million of matter remaine=
d,
which is the Universe, as we see it today. =A0Perhaps the leftovers of the=
epic annihilation, which must have been the mother of all fireworks, are
what we think is Dark Matter. =A0There is no natural anti-matter left in t=
he
Cosmos, but it can be created in a lab.
Artificial antimatter? Someone may try to patent it.
W ; )
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| User: "jcon" |
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| Title: Re: Anti Matter Properties |
08 Jan 2008 10:45:38 PM |
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On Jan 7, 2:26 pm, "Hagar" <ha...@sahm.name> wrote:
"Sanny" <softta...@hotmail.com> wrote in message
news:7bda133b-795a-4680-ab0f-9eef888da4ea@s19g2000prg.googlegroups.com...
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
5. Animatter Repels Mass or is Attracted by Gravity?
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Bye
Sanny
Play Chess at:http://www.GetClub.com/Chess.html
Supposedly, right after the Big Bang there were 1,000,000 particles of
anti-matter for every 1,000,001 particles of matter. When the two were
finished annihilating each other, the 1 part per million of matter remained,
which is the Universe, as we see it today. Perhaps the leftovers of the
epic annihilation, which must have been the mother of all fireworks, are
what we think is Dark Matter. There is no natural anti-matter left in the
Cosmos, but it can be created in a lab.
Minor nit pick: Because we don't see the signature of H-antiH
annihilation,
we know there are no large amounts of antimatter
nearby (where "nearby" is on the scale of galactic superclusters),
but it's still *possible* that distant parts of the universe may
consist
of antimatter. Searching for the signature of this is the goal of
the AMS experiment:
http://ams.cern.ch/
....which, unfortunately, will probably never fly.
-jc
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| User: "Randy Poe" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 12:24:09 PM |
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On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
When a particle and antiparticle annihilate, energy is
released in the form of gammas (high-energy photons).
By conservation of energy, the energy of the gammas
is mc^2 plus whatever kinetic energy was present.
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
I suppose by looking for a lot of gamma radiation of particular
energies as it encountered and annihilated instellar matter.
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
For every particle there is an anti-particle.
A positron is an anti-electron. It has the mass and spin
of an electron (and other quantum numbers), but positive charge.
An antiproton has the mass and other quantum number of
a proton, but negative charge.
And so forth.
As to whether it gravitates like mass, the answer under
current theories is "yes", but the experiment hasn't been
done yet. There is at least one accelerator lab (Brookhaven,
I think) building up a supply of anti-hydrogen enough to
do the test, but as far as I know they haven't done it yet.
5. Animatter Repels Mass or is Attracted by Gravity?
No, the mass is positive and is supposed to gravitate like
anything else with that mass, under the standard model.
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Yes, but reverse the charge of everything. Positrons instead
of electrons, antiprotons instead of protons. (And antineutrons
instead of neutrons, which are uncharged). An antihydrogen
atom consists of a positron bound to an antiproton.
- Randy
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| User: "malibu" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 07:19:49 PM |
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On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
When a particle and antiparticle annihilate, energy is
released in the form of gammas (high-energy photons).
But what are the particle/antiparticle?
Matter of any kind is a combination of spin in two orthogonal planes.
There are two ways you can spin a spin;
clockwise or anti-clockwise. One is matter, the other antimatter.
By conservation of energy, the energy of the gammas
is mc^2 plus whatever kinetic energy was present.
I think less.
I think 2/3.
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
I suppose by looking for a lot of gamma radiation of particular
energies as it encountered and annihilated instellar matter.
3. Does Anti Matter gives Gravity just like Other Masses.
4. Does Anti Matter has a Mass.
For every particle there is an anti-particle.
A positron is an anti-electron. It has the mass and spin
of an electron (and other quantum numbers), but positive charge.
An antiproton has the mass and other quantum number of
a proton, but negative charge.
And so forth.
As to whether it gravitates like mass, the answer under
current theories is "yes", but the experiment hasn't been
done yet. There is at least one accelerator lab (Brookhaven,
I think) building up a supply of anti-hydrogen enough to
do the test, but as far as I know they haven't done it yet.
It gravitates equally.
5. Animatter Repels Mass or is Attracted by Gravity?
No, the mass is positive and is supposed to gravitate like
anything else with that mass, under the standard model.
6. What is the structure/ Molecules present in Antimatter? Does they
have electrons & Nucleus just like other Masses?
Yes, but reverse the charge of everything. Positrons instead
of electrons, antiprotons instead of protons. (And antineutrons
instead of neutrons, which are uncharged). An antihydrogen
atom consists of a positron bound to an antiproton.
- Randy
It's a reversing, but in the
sense of a mirroring. Up is still up,
but left is now right.
John
Galaxy Model for the Atom
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| User: "Androcles" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 07:35:16 PM |
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"malibu" <vegan16@accesscomm.ca> wrote in message
news:1f4c27bf-a246-43c9-826f-66fa051e8fde@e4g2000hsg.googlegroups.com...
| On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
| > On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
| >
| > > Anti Matter is opposite of Matter and when interact with Matter it
| > > finshes itself.
| >
| > > 1. Does Mater + Antimatter reaction Exothermic? Or both combine to
| > > form Vaccume?
| >
| > When a particle and antiparticle annihilate, energy is
| > released in the form of gammas (high-energy photons).
| But what are the particle/antiparticle?
| Matter of any kind is a combination of spin in two orthogonal planes.
| There are two ways you can spin a spin;
| clockwise or anti-clockwise. One is matter, the other antimatter.
|
|
| > By conservation of energy, the energy of the gammas
| > is mc^2 plus whatever kinetic energy was present.
|
| I think less.
Sure. Nothing like stating the obvious, is there?
Do you think at all?, that's the question.
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| User: "malibu" |
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| Title: Re: Anti Matter Properties |
07 Jan 2008 07:42:12 PM |
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On Jan 7, 7:35 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
"malibu" <vega...@accesscomm.ca> wrote in message
news:1f4c27bf-a246-43c9-826f-66fa051e8fde@e4g2000hsg.googlegroups.com...
| On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
| > On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
| >
| > > Anti Matter is opposite of Matter and when interact with Matter it
| > > finshes itself.
| >
| > > 1. Does Mater + Antimatter reaction Exothermic? Or both combine to
| > > form Vaccume?
| >
| > When a particle and antiparticle annihilate, energy is
| > released in the form of gammas (high-energy photons).
| But what are the particle/antiparticle?
| Matter of any kind is a combination of spin in two orthogonal planes.
| There are two ways you can spin a spin;
| clockwise or anti-clockwise. One is matter, the other antimatter.
|
|
| > By conservation of energy, the energy of the gammas
| > is mc^2 plus whatever kinetic energy was present.
|
| I think less.
Sure. Nothing like stating the obvious, is there?
Do you think at all?, that's the question.
I think you have a 1:2 linked rotation where the precession
is 2 counterclockwise meeting the same standing wave with
opposite precession, and the oppositely-moving precessions
will cancel each other until each wave is 1:1. A photon.
Then two gamma ray photons will move away in a train,
but each will have opposite polarity, so they can be split.
I think.
John
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| User: "Androcles" |
|
| Title: Re: Anti Matter Properties |
07 Jan 2008 07:58:21 PM |
|
|
"malibu" <vegan16@accesscomm.ca> wrote in message
news:dd67d1ef-cfc6-4dbd-bebc-52f0b62893e2@j20g2000hsi.googlegroups.com...
| On Jan 7, 7:35 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
| > "malibu" <vega...@accesscomm.ca> wrote in message
| >
| > news:1f4c27bf-a246-43c9-826f-66fa051e8fde@e4g2000hsg.googlegroups.com...
| > | On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
| > | > On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
| > | >
| > | > > Anti Matter is opposite of Matter and when interact with Matter it
| > | > > finshes itself.
| > | >
| > | > > 1. Does Mater + Antimatter reaction Exothermic? Or both combine to
| > | > > form Vaccume?
| > | >
| > | > When a particle and antiparticle annihilate, energy is
| > | > released in the form of gammas (high-energy photons).
| > | But what are the particle/antiparticle?
| > | Matter of any kind is a combination of spin in two orthogonal planes.
| > | There are two ways you can spin a spin;
| > | clockwise or anti-clockwise. One is matter, the other antimatter.
| > |
| > |
| > | > By conservation of energy, the energy of the gammas
| > | > is mc^2 plus whatever kinetic energy was present.
| > |
| > | I think less.
| >
| > Sure. Nothing like stating the obvious, is there?
| > Do you think at all?, that's the question.
|
|
| I think you have a 1:2 linked rotation where the precession
| is 2 counterclockwise meeting the same standing wave with
| opposite precession, and the oppositely-moving precessions
| will cancel each other until each wave is 1:1. A photon.
|
| Then two gamma ray photons will move away in a train,
| but each will have opposite polarity, so they can be split.
|
| I think.
http://www.androcles01.pwp.blueyonder.co.uk/E%5E2/DeriveMC2.htm
.
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| User: "malibu" |
|
| Title: Re: Anti Matter Properties |
07 Jan 2008 08:17:47 PM |
|
|
On Jan 7, 7:58 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
"malibu" <vega...@accesscomm.ca> wrote in message
news:dd67d1ef-cfc6-4dbd-bebc-52f0b62893e2@j20g2000hsi.googlegroups.com...
| On Jan 7, 7:35 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
| > "malibu" <vega...@accesscomm.ca> wrote in message
| >
| >news:1f4c27bf-a246-43c9-826f-66fa051e8fde@e4g2000hsg.googlegroups.com...
| > | On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
| > | > On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
| > | >
| > | > > Anti Matter is opposite of Matter and when interact with Matter it
| > | > > finshes itself.
| > | >
| > | > > 1. Does Mater + Antimatter reaction Exothermic? Or both combine to
| > | > > form Vaccume?
| > | >
| > | > When a particle and antiparticle annihilate, energy is
| > | > released in the form of gammas (high-energy photons).
| > | But what are the particle/antiparticle?
| > | Matter of any kind is a combination of spin in two orthogonal planes.
| > | There are two ways you can spin a spin;
| > | clockwise or anti-clockwise. One is matter, the other antimatter.
| > |
| > |
| > | > By conservation of energy, the energy of the gammas
| > | > is mc^2 plus whatever kinetic energy was present.
| > |
| > | I think less.
| >
| > Sure. Nothing like stating the obvious, is there?
| > Do you think at all?, that's the question.
|
|
| I think you have a 1:2 linked rotation where the precession
| is 2 counterclockwise meeting the same standing wave with
| opposite precession, and the oppositely-moving precessions
| will cancel each other until each wave is 1:1. A photon.
|
| Then two gamma ray photons will move away in a train,
| but each will have opposite polarity, so they can be split.
|
| I think.
http://www.androcles01.pwp.blueyonder.co.uk/E%5E2/DeriveMC2.htm
Yes, I was thinking the two photons
might just as well radiate opposite directions
with their opposite polarities
which would make them
one continuous wave with the center where
the annihilation happened.
That's better.
John
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| User: "Androcles" |
|
| Title: Re: Anti Matter Properties |
08 Jan 2008 03:50:22 AM |
|
|
"malibu" <vegan16@accesscomm.ca> wrote in message
news:b6ab2ebb-fb3b-4149-bc6a-c8b23b24a263@f47g2000hsd.googlegroups.com...
| On Jan 7, 7:58 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
| > "malibu" <vega...@accesscomm.ca> wrote in message
| >
| >
news:dd67d1ef-cfc6-4dbd-bebc-52f0b62893e2@j20g2000hsi.googlegroups.com...
| > | On Jan 7, 7:35 pm, "Androcles" <Engin...@hogwarts.physics_c> wrote:
| > | > "malibu" <vega...@accesscomm.ca> wrote in message
| > | >
| > |
news:1f4c27bf-a246-43c9-826f-66fa051e8fde@e4g2000hsg.googlegroups.com...
| > | > | On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
| > | > | > On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
| > | > | >
| > | > | > > Anti Matter is opposite of Matter and when interact with
Matter it
| > | > | > > finshes itself.
| > | > | >
| > | > | > > 1. Does Mater + Antimatter reaction Exothermic? Or both
combine to
| > | > | > > form Vaccume?
| > | > | >
| > | > | > When a particle and antiparticle annihilate, energy is
| > | > | > released in the form of gammas (high-energy photons).
| > | > | But what are the particle/antiparticle?
| > | > | Matter of any kind is a combination of spin in two orthogonal
planes.
| > | > | There are two ways you can spin a spin;
| > | > | clockwise or anti-clockwise. One is matter, the other antimatter.
| > | > |
| > | > |
| > | > | > By conservation of energy, the energy of the gammas
| > | > | > is mc^2 plus whatever kinetic energy was present.
| > | > |
| > | > | I think less.
| > | >
| > | > Sure. Nothing like stating the obvious, is there?
| > | > Do you think at all?, that's the question.
| > |
| > |
| > | I think you have a 1:2 linked rotation where the precession
| > | is 2 counterclockwise meeting the same standing wave with
| > | opposite precession, and the oppositely-moving precessions
| > | will cancel each other until each wave is 1:1. A photon.
| > |
| > | Then two gamma ray photons will move away in a train,
| > | but each will have opposite polarity, so they can be split.
| > |
| > | I think.
| >
| > http://www.androcles01.pwp.blueyonder.co.uk/E%5E2/DeriveMC2.htm
|
|
| Yes, I was thinking the two photons
| might just as well radiate opposite directions
| with their opposite polarities
| which would make them
| one continuous wave with the center where
| the annihilation happened.
|
| That's better.
Did you notice your pelvis goes in the opposite direction to
the hula hoop?
.
|
|
|
|
|
|
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| User: "The TimeLord" |
|
| Title: Re: Anti Matter Properties |
07 Jan 2008 11:05:56 PM |
|
|
malibu wrote in sci.physics.relativity:
On Jan 7, 12:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
Anti Matter is opposite of Matter and when interact with Matter it
finshes itself.
1. Does Mater + Antimatter reaction Exothermic? Or both combine to
form Vaccume?
When a particle and antiparticle annihilate, energy is
released in the form of gammas (high-energy photons).
But what are the particle/antiparticle?
A particle is essentially anything quantum mechanics says it is. An
antiparticle is what annihilates with its corresponding particle.
Example: electron/positron yielding two 511 keV photons.
Matter of any kind is a combination of spin in two orthogonal planes.
Not necessarily. Bosons are particles that can possibly exist in a
spin=0 state.
There are two ways you can spin a spin;
Not necessarily. Again, bosons can have spin=0,1,2,... There is also
evidence for fermions of spin=3/2. For each spin there can be plus or
minus. So for a spin=3/2 particle there are four ways to spin: -3/2,
-1/2, +1/2, +3/2.
clockwise or anti-clockwise. One is matter, the other antimatter.
No. Spin has nothing to do with whether it is matter or antimatter.
Otherwise helium electrons would be in trouble in the 1s orbital.
By conservation of energy, the energy of the gammas
is mc^2 plus whatever kinetic energy was present.
I think less.
I think 2/3.
You think wrong. Otherwise the law of conservation of energy would be
invalid. Note that an electron and positron annihilate to give two 511
keV photons thus conserving energy by E = mc^2 = hf.
[...]
--
// The TimeLord says:
// Pogo 2.0 = We have met the aliens, and they are us!
.
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| User: "studio" |
|
| Title: Re: Anti Matter Properties |
07 Jan 2008 04:45:46 PM |
|
|
On Jan 7, 1:24=A0pm, Randy Poe <poespam-t...@yahoo.com> wrote:
On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
I suppose by looking for a lot of gamma radiation of particular
energies as it encountered and annihilated instellar matter.
Couldn't a black hole be considered an anti-matter star?
.
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|
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| User: "The TimeLord" |
|
| Title: Re: Anti Matter Properties |
07 Jan 2008 11:12:24 PM |
|
|
studio wrote in sci.physics.relativity:
On Jan 7, 1:24 pm, Randy Poe <poespam-t...@yahoo.com> wrote:
On Jan 7, 1:03 pm, Sanny <softta...@hotmail.com> wrote:
2. Is Antimatter present in the Universe. Say a star is made up of
Antimatter, How will we tell it is built using Antimatter?
I suppose by looking for a lot of gamma radiation of particular
energies as it encountered and annihilated instellar matter.
Couldn't a black hole be considered an anti-matter star?
Not necessarily. A black hole is defined by the fact that all its mass
is contained within its event-horizon. Since the distance to the
event-horizon depends on the mass of the black hole and both matter
and antimatter have positive mass, you really would not be able to
distinguish between a black hole made of matter and one made of
antimatter.
Theoretically you should be able to distinguish between the two if the
black hole had some charge, since then the event horizon size and
shape would be slightly abnormal. However, to date there is no
evidence for black holes with any charge existing. This sort of makes
sense since black holes seem to either come from stars or are at the
centers of galaxies. In both of those situations any excess charge
would dissipate before it became an issue with the black hole. So
naturally you never would have a chance to observe a charged black
hole, whether it is matter or antimatter.
--
// The TimeLord says:
// Pogo 2.0 = We have met the aliens, and they are us!
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