Speaker
Description
Kaluza and Klein proposed a theory with a compactified extra dimension,
which may appear in high-energy phenomena, such as nuclear reactions,
strong gravitational effects, or in the presence of superdense matter.
In this work, I show how astrophysical observables will be modified in
the presence of extra compactified dimensions.
The interior of a compact star is modelled as a multidimensional
interacting degenerate Fermi gas, embedded in a static, spherically
symmetric spacetime with extra compactified spatial dimensions. The
equation of state of this extreme medium is given and compared to the
standard models of superdense matter. The modification of the
mass-radius relation of compact stars is calculated and compared to
realistic star models and astrophysical observation data. The
interaction strength has been determined for this extraordinary matter.
Constraints on the size of the extra dimension have been estimated based
on pulsar measurements [1-3].
[1] A. Horváth, E. Forgács-Dajka, G.G. Barnaföldi: "Application of
Kaluza-Klein Theory in Modeling Compact Stars: Exploring Extra
Dimensions", MNRAS, https://doi.org/10.1093/mnras/stae2637
[2] A. Horváth, E. Forgács-Dajka, G.G. Barnaföldi: "The effect of
multiple extra dimensions on the maximal mass of compact stars in
Kaluza-Klein space-time", IJMPA,
https://doi.org/10.1142/S0217751X25420047
[3] A. Horváth, E. Forgács-Dajka, G.G. Barnaföldi: ”Speed of sound in
Kaluza-Klein Fermi gas”, Accepted into: Acta Physica Polonica, DOI:
10.48550/arXiv.2502.04974
