CM2-3 - (CM2) Cosmology with the Cosmic Microwave Background: Implications of Planck and Other Experiments in Temperature and Polarization (CM3) Galaxy Clusters as probes for Cosmology and Dark Matter |
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Speaker |
Gupt, Brajesh |
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Coauthors |
Ashtekar, Abhay |
| Talk Title |
Power suppression at low multipoles in loop quantum cosmology |
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Abstract |
We investigate observational signatures of the Planck scale physics of loop quantum cosmology (LQC) on the cosmic microwave background (CMB) temperature anisotropy spectrum. Due to the modified dynamics in the pre-inflationary era the initial conditions for both the background and cosmological perturbations in LQC are different from those in the standard inflationary scenario. We find that such modifications can lead to observational signatures and provide a new window to explore the CMB anomalies. In particular, we show that LQC admits initial conditions for which the resulting power spectrum at the end of inflation has less power at large wavelengths. This leads to suppression of power in ($\mathcal C_\ell^{TT}$) at low multipoles (l < 30). We compare our results with the recent observational data and compute the consequences of the power suppression on TE and EE polarization spectrum at the corresponding scales, which are expected to be measured by future CMB observations. |
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