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  1. journals.aps.org

    In the absence of gravity, this class is the most generalclassical action for a Uð1Þ field, as indicated by the no-go result in Ref. [2]. On the other hand, in curved spacetime, one can devise highly nonlinear interactions between the gauge field and gravity. A known extension of the Einstein-Maxwell theory
  2. link.aps.org

    For field theories in curved spacetime, defining how matter gravitates is part of the theory building process. In this paper, we adopt Bekenstein's multiple geometries approach to allow part of the matter sector to follow the geodesics on a general pseudo-Riemannian geometry, constructed from a tensor and a U (1) gauge field. This procedure allows us to generate a previously unknown corner ...
    Author:A. Emir Gumrukcuoglu, Ryo NambaPublished:2019
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  4. In the Jordan frame, apparent high-derivative terms of the vector field are reduced by integrating out an auxiliary variable, at the cost of introducing new matter interactions. As a simple example, we consider a conformal relation between different geometries and demonstrate the presence of an auxiliary degree.
    Author:A. Emir Gumrukcuoglu, Ryo NambaPublished:2019
  5. researchgate.net

    Request PDF | Role of matter in gravitation: going beyond the Einstein-Maxwell theory | For field theories in curved spacetime, defining how matter gravitates is part of the theory building process.
  6. semanticscholar.org

    We propose a new class of gravity theories which are characterized by a nontrivial coupling between the gravitational metric and matter mediated by an auxiliary rank-2 tensor.
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  8. ar5iv.labs.arxiv.org

    Role of matter in gravitation: going beyond the Einstein-Maxwell theory A. Emir Gümrükçüoğlu emir.gumrukcuoglu@port.ac.uk Institute of Cosmology and Gravitation, University of Portsmouth Dennis Sciama Building, Portsmouth PO1 3FX, United Kingdom Ryo Namba namba@physics.mcgill.ca
  9. royalsocietypublishing.org

    We have outlined above the vestiges of a conformally invariant theory of gravity and its exact vacuum and electrovac solutions [3,6,8] and argued that gravity too may need to be recast in terms of a theory relying on a local invariance principle (in the interested reader can find a far more detailed discussion of this theory). The point which ...
  10. inspirehep.net

    For field theories in curved spacetime, defining how matter gravitates is part of the theory building process. In this paper, we adopt Bekenstein's multiple geometries approach to allow part of the matter sector to follow the geodesics on a general pseudo-Riemannian geometry, constructed from a tensor and a U(1) gauge field.
  11. link.springer.com

    The dark matter problem can also be addressed in extended gravity. These applications are contributing to a deeper understanding of the gravitational interaction from both the theoretical and the experimental point of view. ... Italy. He is the author of almost 300 hundred papers and monographs including theory of gravity, gravitational waves ...
  12. Evidence also exists for anomalously strong gravity on the largest observable scale: out to the cosmological horizon. In a universe that contained only ordinary matter (often called baryonic matter, encompassing protons and neutrons, which make up over 99.9% of the mass of ordinary matter), the growth of structures such as galaxies and clusters of galaxies would be suppressed.

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