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  1. that these theories can be associated with new operators in the e ective eld theory of dark energy, which might open up new possibilities to test dark energy models in future surveys. I. INTRODUCTION Scalar tensor theories of gravity play an essential role for building models of in ation and dark energy.
    Author:Marco Crisostomi, Kazuya Koyama, Gianmassimo TasinatoPublished:2016
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  3. We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with higher order equations of motion. We then classify the most general, consistent scalar-tensor ...
  4. iopscience.iop.org

    5.2 Unitary gauge and effective field theory of dark energy 12 6 Summary and discussion 13 1 Introduction Scalar tensor theories of gravity play an essential role for building models of inflation and dark energy. The most general scalar-tensor theory leading to second order equations of motion,
    Author:Marco Crisostomi, Kazuya Koyama, Gianmassimo TasinatoPublished:2016
  5. research.manchester.ac.uk

    strengths that need not be Planck-suppressed. Examples include scalar-tensor theories of gravity[2], such as the Brans-Dicke theory[3]or, more generally, the Horndeski theories[4,5](including beyond Horndeski[6,7]and DHOST[8,9]theories), in which the gravitational sector includes both the metric and an additional scalar degree of freedom.
  6. iopscience.iop.org

    We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with higher order equations of motion.
    Author:Marco Crisostomi, Kazuya Koyama, Gianmassimo TasinatoPublished:2016
  7. researchportal.port.ac.uk

    T1 - Extended scalar-tensor theories of gravity. AU - Crisostomi, Marco. AU - Koyama, Kazuya. AU - Tasinato, Gianmassimo. N1 - 15 pages, published version. PY - 2016/4/21. Y1 - 2016/4/21. N2 - We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications ...
  8. semanticscholar.org

    We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with higher order equations of motion. We then classify the most general, consistent scalar-tensor ...
  9. to theories quadratic in second derivatives of the scalar. We dub such theories extended scalar-tensor theories of gravity, in brief EST theories. When comparison is possible, our results agree with [7]; on the other hand, we extend the ndings of [7] by determining various further classes of consistent theories, which we carefully classify.
  10. term corresponds to a scalar field:1 for example, fourth-order gravity gives Ein-stein plus one scalar field, sixth-order gravity gives Einstein plus two scalar fields and so on [20; 24]. Furthermore, it is possible to show that the f(R)-gravity is equivalent not only to a scalar-tensor one but also to the Einstein theory plus an ideal ...

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