Does Positronium Form in the Universe ?

Details Does Positronium Form in the Universe ? Does Positronium Form in the Universe ?

2004-05-14

arxiv.org/abs/astro-ph/0405273v1

JCAP 0406 (2004) 003

Astronomy and Astrophysics

Astrophysics

13 pages, to appear in JCAP

Scientific paper

10.1088/1475-7516/2004/06/003

Positronium (the bound state of electron and positron) has been thought to be formed after proton decay ($>10^{34}$yr) through collisional recombination and then decays by pair annihilation, thereby changing the matter content of the universe. We revisit the issue of the formation of positronium in the long-term future of the universe in light of recent indication that the universe is dominated by dark energy and dark matter. We find that if the equation of state of dark energy $w$ is less than -1/3 (including the cosmological constant $w=-1$), then the formation of positronium would not be possible, while it is possible through bound-bound transitions for $-1/3\siml w\siml-0.2$, or through collisional recombination for $w\simg-0.2$. The radiation from $\epm$ pair annihilation cannot dominate over $\epm$, while that from proton decay will dominate over baryon and $\epm$ for a while but not over dark matter.

Affiliated with

Also associated with

No associations

Rating

Does Positronium Form in the Universe ? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Does Positronium Form in the Universe ?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Does Positronium Form in the Universe ? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-671039