Dark Energy as a Modification of the Friedmann Equation

Details Dark Energy as a Modification of the Friedmann Equation Dark Energy as a Modification of the Friedmann Equation

2003-01-25

arxiv.org/abs/astro-ph/0301510v1

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures

Scientific paper

Dark energy could actually be the manifestation of a modification to the Friedmann equation arising from new physics (e.g., extra dimensions). Writing the correction as $(1-\Omega_M)H^\alpha /H_0^{\alpha -2}$, we explore the phenomenology and detectability of such. We show that: (i) $\alpha$ must be $\la 1$; (ii) such a correction behaves like dark energy with equation-of-state $w_{\rm eff} = -1 + {\alpha \over 2}$ in the recent past ($10^4> z\gg 1$) and $w=-1$ in the distant future and can mimic $w<-1$ without violating the weak-energy condition; (iii) $w_{\rm eff}$ changes, $dz/dw|_{z\sim 0.5} \sim {\cal O}(0.2)$, which is likely detectable; and (iv) a future supernova experiment like SNAP that can determine $w$ with precision $\sigma_w$, could determine $\alpha$ to precision $\sigma_\alpha \approx 2 \sigma_w$.

Affiliated with

Also associated with

No associations

Rating

Dark Energy as a Modification of the Friedmann Equation 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 Dark Energy as a Modification of the Friedmann Equation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark Energy as a Modification of the Friedmann Equation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-715326