Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-05-07
Phys.Rev. D66 (2002) 081301
Physics
High Energy Physics
High Energy Physics - Theory
Revised to match the published version. Minor changes and a reference added
Scientific paper
10.1103/PhysRevD.66.081301
Cosmological observations suggest the existence of two different kinds of energy densities dominating at small ($ \lesssim 500$ Mpc) and large ($\gtrsim 1000 $ Mpc) scales. The dark matter component, which dominates at small scales, contributes $\Omega_m \approx 0.35$ and has an equation of state $p=0$ while the dark energy component, which dominates at large scales, contributes $\Omega_V \approx 0.65$ and has an equation of state $p\simeq -\rho$. It is usual to postulate wimps for the first component and some form of scalar field or cosmological constant for the second component. We explore the possibility of a scalar field with a Lagrangian $L =- V(\phi) \sqrt{1 - \del^i \phi \del_i \phi}$ acting as {\it both} clustered dark matter and smoother dark energy and having a scale dependent equation of state. This model predicts a relation between the ratio $ r = \rho_V/\rho_{\rm DM}$ of the energy densities of the two dark components and expansion rate $n$ of the universe (with $a(t) \propto t^n$) in the form $n = (2/3) (1+r) $. For $r \approx 2$, we get $n \approx 2$ which is consistent with observations.
Choudhury Tirthankar Roy
Padmanabhan Thanu
No associations
LandOfFree
Can the clustered dark matter and the smooth dark energy arise from the same scalar field ? 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 Can the clustered dark matter and the smooth dark energy arise from the same scalar field ?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can the clustered dark matter and the smooth dark energy arise from the same scalar field ? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-658630