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Constraining isocurvature perturbations with cosmic microwave background polarization
1Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.
Physical Review Letters
|November 3, 2001
Summary
Cosmic Microwave Background polarization data, particularly from the PLANCK mission, will strongly limit primordial isocurvature modes. This will enable accurate universe curvature determination without assuming adiabaticity.
Area of Science:
- Cosmology
- Astrophysics
- Cosmic Microwave Background Radiation
Background:
- Primordial isocurvature modes are a key feature in early universe models.
- Constraining these modes is crucial for understanding cosmic evolution.
- Current data limitations affect the precision of cosmological parameter estimation.
Purpose of the Study:
- To examine the role of cosmic microwave background (CMB) polarization data in constraining primordial isocurvature modes.
- To assess the capabilities of missions like MAP and PLANCK in this regard.
- To investigate the impact of isocurvature modes on universe curvature measurements.
Main Methods:
- Analysis of simulated data from future CMB missions (PLANCK, MAP).
- Investigating the degeneracy between isocurvature modes and standard cosmological parameters.
- Comparing results with existing observational data (BOOMERANG).
Main Results:
- The MAP mission will be unable to simultaneously constrain isocurvature modes and cosmological parameters.
- The PLANCK mission is expected to set strong limits on isocurvature modes.
- Allowing for isocurvature modes causes the BOOMERANG measurement of universe curvature to fail.
Conclusions:
- CMB polarization data is vital for constraining isocurvature modes.
- Future missions like PLANCK will provide unprecedented limits.
- Accurate universe curvature determination requires accounting for or constraining isocurvature modes.