Electromagnetic Sources Teleparallel Robertson--Walker $F(T)$-Gravity Solutions

TL;DR

This paper derives new solutions in $F(T)$-gravity for cosmological electromagnetic sources across different universe curvatures, providing analytical models for various expansion scenarios with potential future cosmological applications.

Contribution

The paper introduces novel $F(T)$-gravity solutions for electromagnetic sources in Robertson--Walker spacetime, covering all curvature cases and expansion rates, expanding the theoretical framework.

Findings

New solutions for $k=0$ for any scale factor $n$.

Exact and approximate solutions for $k=±1$ in different expansion regimes.

Relevance for future cosmological models involving electromagnetic processes.

Abstract

We investigate the teleparallel Robertson--Walker (TRW) $F(T)$-gravity solutions for a cosmological electromagnetic source in the current paper. We use and solve the TRW $F(T)$-gravity field equations (FEs) for each value of the $k$-parameter $(-1,\,0,\,+1)$ and the electromagnetic equivalent of the equation of state (EoS), leading to new teleparallel $F(T)$ solutions. For the $k=0$ cosmological case, we find new teleparallel $F(T)$ solutions for any scale factor $n$. For $k=\pm 1$ cosmological cases, we find exact and far-future approximated new teleparallel $F(T)$ solutions for slow, linear, fast and infinitely fast universe expansion summarized by analytical functions. All the new solutions are relevant for future cosmological applications, implying any electromagnetic source processes, such as the cosmological plasma models.