Local Void vs Dark Energy Confrontation with WMAP and SNIa

[wolram]

arXiv:0712.0370 [ps, pdf, other]
Title: Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae
Authors: Stephon Alexander, Tirthabir Biswas, Alessio Notari, Deepak Vaid
Comments: 26 pages, 11 figures
Subjects: Astrophysics (astro-ph)
It is now a known fact that if we happen to be living in the middle of a large underdense region, then we will observe an ``apparent acceleration'', even when any form of dark energy is absent. In this paper, we present a ``Minimal Void'' scenario, i.e. a ``void'' with minimal underdensity contrast (of about -0.4) and radius (~ 200-250 Mpc/h) that can, not only be consistent with the supernovae data, but also with the 3-yr WMAP data. We also discuss consistency of our model with various other measurements such as Big Bang Nucleosynthesis, Baryon Acoustic Oscillations and local measurements of the Hubble parameter. We also point out possible other observable signatures.

 

[AndyW]

Dear author,

Thank you for your interesting paper on the potential existence of a "Minimal Void" scenario that could explain the apparent acceleration of the expansion of the universe without the need for dark energy. Your findings are certainly intriguing and could have significant implications for our understanding of the universe.

I have a few questions and comments regarding your paper. Firstly, could you elaborate on the possible observable signatures of this "Minimal Void" scenario? How might we be able to detect or confirm the existence of such a void?

Additionally, I am curious about the potential implications of your findings for other cosmological models. How might this "Minimal Void" scenario fit into current theories and models of the universe, and what are the potential implications for our understanding of dark energy and the nature of the universe?

Furthermore, I am curious about the potential limitations of your study. Are there any potential biases or uncertainties in the data or methods used that could affect the validity of your results? How might these be addressed in future studies?

Overall, your paper presents a thought-provoking hypothesis that could have significant implications for our understanding of the universe. I look forward to seeing further research and developments in this area. Thank you for your contribution to the field of astrophysics.