AP2 - Neutrino Physics Astrophysics and Cosmology |
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Speaker |
Lattanzi, Massimiliano |
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Co-autors |
R. Benini, G. Montani |
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Talk Title |
On the Propagation of Gravitational Waves across the Universe: Interaction with the Neutrino Component. |
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Abstract |
The stochastic background of primordial gravitational waves is a target for several experiments, spanning many orders of magnitude in frequency. At large wavelengths, it can be detected in the B-modes of the cosmic microwave background. At small scales, it is the target of detectors like LISA. Gravitational waves interact with the anisotropic stress of the cosmological fluid, mainly given by its neutrino component. While at the large scales this is effectively collisionless, in the small-scale limit, the collisions between neutrinos should be properly taken into account for the computation of the anisotropic stress. In this talk we will present the results of the integration of the Einstein-Boltzmann system of differential equations for the coupled gravitational wave-neutrino system, and we will discuss how this will affect the expected signal of stochastic gravitational waves. |
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