Further analysis of a cosmological model with quintessence and scalar dark matter

By T. Matos, L. Arturo Ureña‐López. 2000

227 citations recorded by the source corpus.

We present the complete solution to a $95%$ scalar field cosmological model in which the dark matter is modeled by a scalar field $\ensuremath{\Phi}$ with the scalar potential $V(\ensuremath{\Phi}{)=V}_{0}[\mathrm{cosh}(\ensuremath{\lambda}\sqrt{{\ensuremath{\kappa}}_{0}}\ensuremath{\Phi})\ensuremath{-}1]$ and the dark energy is modeled by a scalar field \ensuremath{\Psi}, endowed with the scalar potential $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{V}(\ensuremath{\Psi})={V}_{0}[\mathrm{sinh}(\ensuremath{\alpha}\sqrt{{\ensuremath{\kappa}}_{0}}\ensuremath{\Psi}){]}^{\ensuremath{\beta}}.$ This model has only two free parameters, \ensuremath{\lambda} and the equation of state ${\ensuremath{\omega}}_{\ensuremath{\Psi}}.$ With these potentials, the fine-tuning and cosmic coincidence problems are ameliorated for both dark matter and dark energy and the model agrees with astronomical observations. For the scalar dark matter, we clarify the meaning of a scalar Jeans length and then the model predicts a suppression of the mass power spectrum for small scales having a wave number $kg{k}_{\mathrm{min},\ensuremath{\Phi}},$ where ${k}_{\mathrm{min},\ensuremath{\Phi}}\ensuremath{\simeq}4.5h$ ${\mathrm{Mpc}}^{\ensuremath{-}1}$ for $\ensuremath{\lambda}\ensuremath{\simeq}20.28.$ This last fact could help to explain the death of dwarf galaxies and the smoothness of galaxy core halos. From this, all parameters of the scalar dark matter potential are completely determined. The dark matter consists of an ultralight particle, whose mass is ${m}_{\ensuremath{\Phi}}\ensuremath{\simeq}1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}23}$ eV and all the success of the standard cold dark matter model is recovered. This implies that a scalar field could also be a good candidate the dark matter of the Universe.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8592649d7eca5efeaad736ea536d75d66657994e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Angular Momentum and Vortex Formation in Bose-Einstein-Condensed Cold Dark Matter Haloes (2011, background): “…(1983); Baldeschi, Gelmini & Ruffini (1983); Khlopov, Malomed & Zeldovich (1985); Membrado, Pacheco & Sañude (1989); Press, Ryden & Spergel (1990); Widrow & Kaiser (1993); Sin (1994); Schunck (1998); Lee & Koh (1996); Schunck, Fuchs & Mielke (2006) and Matos & Ureña-López (2001) to name a few.”
f(R) Theories Of Gravity (2008, methodology): “…matter using scalar fields (Alcubierre et al., 2002a,b; Bernal and Guzman, 2006a,b,c; Bernal and Matos, 2005; Cervantes-Cota et al., 2007a,b; Matos and Guzman, 2000; Matos et al., 2001; Matos and Urena-Lopez, 2001, 2007; Rodriguez-Meza and Cervantes-Cota, 2004; Rodriguez-Meza et al., 2005, 2007).”
Flat central density profiles from scalar field dark matter halos (2003, methodology): “Furthermore, it predicts a sharp cut-off in the mass power spectrum due to its quadratic nature, thus explaining the observed dearth of dwarf galaxies, in contrast with the possible excess predicted by high resolution N-body simulations with standard CDM, see Matos and Ureña-López 2001.”
Gravitational Cooling of Self-gravitating Bose Condensates (2006, background): “One principal idea is that scalar fields can form Bose condensates and then are able to form structure (Hu et al. 2000; Arbey et al. 2001, 2002, 2003; Matos & Ureña-López 2001).”