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Larger value for H0 by an evolving gravitational constant (2020)
Journal Article
Braglia, M., Ballardini, M., Emond, W. T., Finelli, F., Gümrükçüoğlu, A. E., Koyama, K., & Paoletti, D. (2020). Larger value for H0 by an evolving gravitational constant. Physical Review D, 102(2), Article 023529. https://doi.org/10.1103/physrevd.102.023529

We provide further evidence that a massless cosmological scalar field with a nonminimal coupling to the Ricci curvature of the type M2pl(1+??n/Mnpl) alleviates the existing tension between local measurements of the Hubble constant and its inference f... Read More about Larger value for H0 by an evolving gravitational constant.

Black holes in self-tuning cubic Horndeski cosmology (2020)
Journal Article
Emond, W. T., Lehébel, A., & Saffin, P. M. (2020). Black holes in self-tuning cubic Horndeski cosmology. Physical Review D, 101(8), Article 084008. https://doi.org/10.1103/physrevd.101.084008

Observations of neutron star mergers in the late Universe have given significant restrictions to the class of viable scalar-tensor theories. In this paper we construct black holes within the “self-tuning” class of this restricted set, whereby the bar... Read More about Black holes in self-tuning cubic Horndeski cosmology.

Scattering amplitudes, black holes and leading singularities in cubic theories of gravity (2019)
Journal Article
Emond, W. T., & Moynihan, N. (2019). Scattering amplitudes, black holes and leading singularities in cubic theories of gravity. Journal of High Energy Physics, 2019(12), https://doi.org/10.1007/jhep12%282019%29019

We compute the semi-classical potential arising from a generic theory of cubic gravity, a higher derivative theory of spin-2 particles, in the framework of modern amplitude techniques. We show that there are several interesting aspects of the potenti... Read More about Scattering amplitudes, black holes and leading singularities in cubic theories of gravity.