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A Model for Structure Formation Seeded by Gravitationally Produced Matter.
The Astrophysical Journal
|December 22, 1999
Summary
This study introduces a new dark matter model with relativistic fluid behavior, differing from standard cold dark matter. Its predictions align with current data but offer distinct features for future observational tests.
Area of Science:
- Cosmology
- Particle Physics
- Astrophysics
Background:
- The standard cosmological model relies on cold dark matter (CDM) and adiabatic fluctuations.
- Previous models have not fully explained the observed distribution of matter and radiation.
Purpose of the Study:
- To propose and analyze a new cosmological model incorporating a dark matter component with relativistic fluid properties.
- To investigate the implications of this model for the early universe and large-scale structure formation.
Main Methods:
- Developing a theoretical model where dark matter behaves as a relativistic ideal fluid, potentially a scalar field with a quartic potential.
- Analyzing the implications of gravitational production of this component during inflation.
- Calculating the power spectra of mass and radiation distributions within this new model.
Main Results:
- The model's predicted power spectra for mass and radiation are consistent with current observational data.
- Significant deviations from the standard adiabatic cold dark matter model are identified.
Conclusions:
- The proposed dark matter model offers a viable alternative to the standard CDM paradigm.
- The identified differences provide a clear pathway for future observational experiments to test and potentially confirm this new model.