# Tag Info

1

Believe it or not, this was actually a theory held back in the 1990's! Astronomers back then thought that GRBs were the direct result of anti-matter-matter collisions (between anti-matter comets and matter comets) that were taking place in the Oort cloud. This 1996 article by Chuck Dermer (paywall), titled Gamma-ray bursts from comet-antimatter comet ...

0

Here is a thesis trying to fit the spectra of the observed gamma rays, and if you read the conclusions you will see that there are various sources. One has to distinguish antimatter as low in energy as a positron, which can also appear from decays of isotopes: The observed distribution of gamma rays is consistent with the standard picture where the ...

-1

Because a photon is a packet of electromagnetic energy, so it must be interacted by the same field or any of electric or magnetic field. As nucleus has a certain electric field by which photon's field actually interacts and the result of this interaction is pair production-to conserve energy momentum and charge.

1

A proton has a positive charge so by charge conservation it is not possible to reduce a proton to uncharged radiation particles such as photons (assuming that is what you mean by "pure-energy") Because of gauge invariance charge conservation is likely to hold good in all future physics, but we can't be totally sure of that. It is possible that some charged ...

0

The simple answer to the main question is, yes. There are two ways to annihilate matter without using anti-matter. One is called fission, and the other is called fusion. Although only some of the matter is converted into energy in either of these processes, the efficiency of the "annihilation" is not in the main question. If 100% annihilation is required, ...

0

The antineutrinos do indeed form a doublet. The particle-antiparticle conjugation operator is usually denoted by $\hat{C}$ and is defined through: $$\hat{ C}: \psi \rightarrow \psi ^c = C \bar{\psi} ^T$$ where $C \equiv i \gamma _2 \gamma _0$. So given a neutrino you can always get its complex conjugate with this operator: ...

0

You're asking about the leptonic sector of the standard model of Glashow, Salam, and Weinberg*, in particular the lightest generation $(\nu_e,e)$, of which there are three, sometimes denoted: \begin{align} L_e &= \frac{1-\gamma_5}{2}\left(\begin{matrix}\nu_e \\ e\end{matrix}\right) & L_\mu &= \frac{1-\gamma_5}{2}\left(\begin{matrix}\nu_\mu \\ ...

13

The definition of an antiparticle is dependent on having the opposite quantum numbers of the particle so that they can annihilate, i.e. the sum of the conserved quantum numbers are zero. Thus the answer by @mpv is adequate. The implication of your question is then: is baryon number conservation a strict law or an emergent law that may be violated at some ...

2

I just started here so I don't have the rep. to comment and I don't have the time for a full answer, but the black hole idea mentioned in the comments above is a fine answer. See, for example, http://arxiv.org/abs/0908.1803v1 and How would a black hole power plant work?

16

I am assuming that by "energy" you mean photons. So you want to transform protons into photons. It is not possible. It would violate several conservation laws - mainly the charge conservation (protons are positively charged), but also baryon number conservation. The antiparticle is necessary to cancel these quantum charges to make the transition possible.

2

Elementary particles differ in flavour from their antiparticles, so conservation laws do, indeed, restrict whether particles or antiparticles can be produced in certain processes. (Compare, e.g., the photon, which has zero for all its flavour quantum numbers, and is identical to its antiparticle.) For example, when a neutron decays, the result is a proton, ...

1

There are two possible Feynman graphs for Bhabha scattering at tree level. I have shown them below. Are you asking what will go wrong if these two are modified like shown below. If this is what you are asking then the only thing that we should be concerned about is the conservation of charge at each vertex point. We can ...

-1

Energy would exhibit both positive as well as negative energy if it were a living entity. So first one must answer is time alive? To solve any equasion shouldn't you know the values of all propertys within it?Idetify the propertys first. Only then could you solve it.

3

There are various theories about how the matter anti-matter asymmetry arose. See this search for lots of related questions. It's generally believed that the Big Bang formed almost equal quantities of matter and anti-matter, but there was a very small inbalance i.e. there was slightly more matter. The anti-matter all annihilated with matter to leave normal ...

Top 50 recent answers are included