MGAT8 - Alternative Theories |
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Speaker |
REBOUCAS, MARCELO |
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Co-autors |
J. Santos and S.E. Perez Bergliaffa |
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Talk Title |
Violation of causality in f(R) gravity |
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Abstract |
We examine the question as whether the f(R) gravity theories that satisfy the local gravity constraints as well as the conditions for cosmological viability permit space-times in which the causality principle is violated. We show that the field equations of these f(R) gravity theories do not exclude solutions with violation of causality for a physically well-motivated perfect-fluid matter content, despite its Lorentzian character which leads to the local validity of the causality principle. |
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