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    Article ID: 648

    Mass-energy equivalence and the gravitational redshift: Does energy always have mass?

    by Germano D’Abramo

    Insight - Physics, Vol.7, No.1, 2024; 95 Views, 35 PDF Downloads

    One of the most widespread interpretations of mass-energy equivalence establishes that not only can mass be transformed into energy (e.g., through nuclear fission, fusion, or annihilation), but that every type of energy also has mass (via the mass-energy equivalence formula). Here, we show that this is not always the case. With the help of a few thought experiments, we show that, for instance, the electric potential energy of a charged capacitor should not contribute to the capacitor’s gravitational rest mass (while still contributing to its linear momentum). That result is in agreement with the fact that light (ultimately, an electromagnetic phenomenon) has momentum but not rest mass.

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Call for Papers for the Special Issue: Insight-Physics

2019-08-26

Insight-Physics publishes important advances in various branches in physics,focus on the study of matter, energy, space, time, and in particular their respective properties and interrelationships with each other. Physics is a knowledge of the laws of nature; More broadly, physics explores the phenomena that occur in nature to understand its rules.

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