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  1. cordis.europa.eu

    To illustrate how this small-scale approach had a big impact, consider the project's work on the general scalar tensor theory, an extension of GR that includes a scalar field. "We made significant contributions to the development of more general scalar tensor theories beyond the original theory published in the 1970s," remarks Koyama.
  2. worldscientific.com

    modi ed gravity models are introduced, which satisfy the Solar System constrains as well as the constraint on the speed of gravitational waves obtained from almost simultaneous detections of gravitational waves and gamma ray bursts from a neutron star merger (GW170817/GRB 170817A). Keywords: Cosmology; general relativity; modi ed gravity. 1 ...
  3. semanticscholar.org

    We introduce the standard model of cosmology based on general relativity and discuss its successes and problems. We then discuss motivations to consider gravitational theories beyond general relativity and summarize observational and theoretical constraints that these theories need to satisfy. A special focus is laid on screening mechanisms, which hide deviations from general relativity in the ...
  4. Jun 24, 2024This thesis embarks on a comprehensive investigation of modified gravity theories and their implications on the properties of compact objects. Our primary objective is to shed light on the fundamental nature of gravity by exploring potential departures from General Relativity (GR) through a combination of theoretical analyses and observational techniques. On the theoretical side, we consider ...
  5. Einstein's General Relativity (GR) is possibly one of the greatest intellectual achievements ever conceived by the human mind. In fact, over the last century, GR has proven to be an extremely successful theory, with a well established experimental footing. However, the discovery of the late-time cosmic acceleration, which represents a new imbalance in the governing gravitational field ...
    Author:Tiberiu Harko, Tiberiu Harko, Francisco S. N. LoboPublished:2020
  6. researchportal.port.ac.uk

    T1 - Gravity beyond general relativity. AU - Koyama, Kazuya. N1 - 12 month embargo. PY - 2018/7/16. Y1 - 2018/7/16. N2 - We introduce the standard model of cosmology based on general relativity and discuss its successes and problems. We then discuss motivations to consider gravitational theories beyond general relativity and summarise ...
  7. link.springer.com

    At the core of this thesis is the question of modifying general relativity. In the previous chapter, we introduced general relativity and its cosmological solutions, culminating in a discussion of two key aspects of the cosmological standard model: \(\Lambda \) CDM at late times and inflation at early times. In this chapter, we extend that discussion to theories of gravity beyond general ...
  8. worldscientific.com

    We introduce the standard model of cosmology based on general relativity and discuss its successes and problems. We then discuss motivations to consider gravitational theories beyond general relativity and summarize observational and theoretical constraints that these theories need to satisfy.
  9. cordis.europa.eu

    Einstein's theory of General Relativity (GR) is tested accurately within the local universe i.e., the solar system, but this leaves open the possibility that it is not a good description at the largest scales in the Universe. ... CosTesGrav. Grant agreement ID: 646702 Open in new window Project website DOI 10.3030/646702. Project closed EC ...
  10. inspirehep.net

    Gravity beyond general relativity. Kazuya Koyama. Jul 16, 2018. 39 pages. Published in: Int.J.Mod.Phys.D 27 (2018) 15, 1848001; Published: Jul 16, 2018. DOI: 10.1142/S0218271818480012 ... We then discuss motivations to consider gravitational theories beyond general relativity and summarize observational and theoretical constraints that these ...

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