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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Cosmic strings, effective number of neutrinos, gravity waves and the CMB

## Cosmic strings, effective number of neutrinos, gravity waves and the CMBAdd to your list(s) Download to your calendar using vCal - Urrestilla, J (University of the Basque Country)
- Tuesday 04 December 2012, 12:10-12:30
- Seminar Room 1, Newton Institute.
If you have a question about this talk, please contact Mustapha Amrani. Topological Dynamics in the Physical and Biological Sciences We will report about recent work concerning cosmic defects, gravity waves and the CMB . On one hand, we simulate a scaling network of cosmic defects, and predict the background gravity wave emission coming from them. On the other, we study degeneracies in the CMB data between cosmic strings and gravity waves. When one tries to fit the CMB data with the effective number of neutrinos as a free parameter, the data prefers a higher number effective neutrinos. There have been works suggesting that the extra relativistic signal could come from gravity waves, and those waves could be created by cosmic defects. We perform a full analysis of the system taking into account the signal that such a network would create, its effect into the effective number of neutrinos, and how those parameters interplay in trying to fit different probes of CMB and other cosmological data. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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