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Stellar and Substellar Objects in Modified Gravity

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Modified and Quantum Gravity

Part of the book series: Lecture Notes in Physics ((LNP,volume 1017))

Abstract

The last findings on stellar and substellar objects in modified gravity are presented, allowing a reader to quickly jump into this topic. Early stellar evolution of low-mass stars, cooling models of brown dwarfs and giant gaseous exoplanets as well as internal structure of terrestrial planets are discussed. Moreover, possible test of models of gravity with the use of the discussed objects are proposed.

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Notes

  1. 1.

    However the “which one?” is a question which many physicists try to answer.

  2. 2.

    In the further part, we will introduce the rescaled model parameter \(\alpha \) to simplify some expression; see the discussion after (11.12).

  3. 3.

    We have used the relation between the Starobinsky parameter \(\beta \) and rescaled parameter \(\alpha \) again.

  4. 4.

    some massive brown dwarfs do burn hydrogen, however the process is not stable (\(L_{HB}\neq L_{ph}\)) and since although there is some energy production, the object radiates more than produces, therefore it is cooling down and following the BDs’ evolution.

  5. 5.

    https://github.com/mariabenitocst/brown_dwarfs_palatini

  6. 6.

    https://www.esa.int/Science_Exploration/Space_Science/Voyage_2050_sets_sail_ESA_chooses_future_science_mission_themes

  7. 7.

    in the case of larger terrestrial planets we observe a significant difference, making the exoplanet’s composition more difficult to determine [13, 38].

  8. 8.

    https://mars.nasa.gov/insight/spacecraft/instruments/seis/

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Acknowledgements

This work was supported by the EU through the European Regional Development Fund CoE program TK133 “The Dark Side of the Universe”.

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Authors and Affiliations

  1. Institute of Physics, University of Tartu, Tartu, Estonia

    Aneta Wojnar

  2. Department of Theoretical Physics and IPARCOS, Faculty of Physical Sciences, Complutense University of Madrid, Madrid, Spain

    Aneta Wojnar

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  1. Aneta Wojnar
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Correspondence to Aneta Wojnar .

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Editors and Affiliations

  1. ZARM, University of Bremen, Bremen, Germany

    Christian Pfeifer

  2. ZARM, University of Bremen, Bremen, Germany

    Claus Lämmerzahl

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Wojnar, A. (2023). Stellar and Substellar Objects in Modified Gravity. In: Pfeifer, C., Lämmerzahl, C. (eds) Modified and Quantum Gravity. Lecture Notes in Physics, vol 1017. Springer, Cham. https://doi.org/10.1007/978-3-031-31520-6_11

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