AT2 - Extended Theories of Gravity and Quantum Cosmology |
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Speaker |
Esposito, Giampiero |
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Coauthors |
D. Bini, C. Kiefer, M. Kramer, F. Pessina |
| Talk Title |
Is there a quantum gravity effect on the cosmic microwave background power spectrum? |
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Abstract |
An assessment is made of recent attempts to evaluate how quantum gravity may affect the anisotropy spectrum of the cosmic microwave background. A perturbative scheme for the solution of the Wheeler-DeWitt equation has been found to allow for enhancement of power at large scales, whereas the alternative predicts a suppression of power at large scales. Both effects are corrections which, although conceptually interesting, turn out to be too small to be detected. Another scheme relies upon a Born-Oppenheimer analysis. By using a perturbative approach to the nonlinear ordinary differential equation obeyed by the two-point function for scalar fluctuations, a new family of power spectra has been obtained and studied. |
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