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A new look at the accelerating universe.
1Physics Department, P.O. Box 413, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA. leonard@uwm.edu
Physical Review Letters
|February 15, 2001
Summary
A new vacuum-dominated cold dark matter (VCDM) model with zero cosmological constant aligns with cosmic microwave background radiation and supernova data. This model offers an alternative to the standard cosmological model with a small, non-zero cosmological constant.
Area of Science:
- Cosmology
- Theoretical Physics
- Astrophysics
Background:
- The standard cosmological model incorporates a small, non-zero cosmological constant.
- Observational data from cosmic microwave background radiation and supernovae provide crucial tests for cosmological models.
Purpose of the Study:
- To investigate a novel cosmological model (VCDM) with a zero cosmological constant, utilizing vacuum energy from a quantized free scalar field.
- To compare the VCDM model's performance against observational data with the standard cosmological model.
Main Methods:
- Analysis of cosmic microwave background radiation (CMBR) power spectrum.
- Analysis of Type Ia supernova (SNe-Ia) data.
- Parameter fitting for the VCDM model.
Main Results:
- The VCDM model demonstrates agreement with CMBR and SNe-Ia data comparable to the standard model.
- The VCDM model yields a ratio of vacuum pressure to vacuum energy density less than -1.
- A specific set of VCDM parameters provides an excellent fit to both CMBR and SNe-Ia observations.
Conclusions:
- The VCDM model presents a viable alternative to the standard cosmological model.
- Vacuum energy from a simple quantized scalar field can effectively explain cosmological observations without a cosmological constant.