AT2 - Extended Theories of Gravity and Quantum Cosmology |
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Speaker |
Loureiro Giacchini, Breno |
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| Talk Title |
Experimental Limits On The Free Parameters Of Higher-Derivative Gravity |
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Abstract |
Higher-derivative gravity (HDG) has two free parameters, $\alpha$ and $\beta$, which couple the curvature-squared terms, $R^2$ and $R_{\mu\nu}^2$, respectively. Both Newtonian inverse-square law experiments and relativistic effects have recently been used to stablish bounds to many interesting models, such as $f(R)$ and scalar-tensor theories, extra-dimension scenarios and Standard Model extensions. Our aim in this work is to review those experimental results in the context of HDG. The strictest limit we report ($\alpha,\beta\leq10^{58}$) follows from E\"ot-Wash torsion-balance experiments. Interestingly, the bound on $\beta$ due to semiclassical deflection of photons grazing the Sun is only three orders of magnitude larger. |
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