Effects of modified gravity on B-mode polarization - INSPIRE

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Effects of modified gravity on B-mode polarization

Luca Amendola
(
- Heidelberg U.
)
,
Guillermo Ballesteros
(
- Heidelberg U.
)
,
Valeria Pettorino
(
- Heidelberg U.
)

May 27, 2014

13 pages

Published in:

Phys.Rev.D 90 (2014) 043009

Published: Aug 20, 2014

e-Print:

1405.7004 [astro-ph.CO]

DOI:

10.1103/PhysRevD.90.043009

View in:

ADS Abstract Service

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Abstract: (APS)

We explore the impact of modified gravity on B-modes, identifying two main separate effects: lensing and propagation of tensor modes. The location of the inflationary peak of the BB spectrum depends on the speed of gravitational waves; the amplitude of the lensing contribution depends on the anisotropic stress. We single out these effects using the quasistatic regime and considering models for which the background and the growth of matter perturbations are standard. Using available data we obtain that the gravitational wave speed is compatible with the speed of light and constrained to within about 10%.

Note:

15 pages, 8 figures. Discussion expanded. Typos corrected. To appear in Phys. Rev. D

95.36.+x
04.30.-w
04.50.Kd
98.80.-k
gravitation: model
metric: perturbation
gravitation: lens
cosmic background radiation: polarization
cosmic background radiation: power spectrum
gravitational radiation

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