Extension of the frequency-range of interferometers for the ''magnetic'' components of gravitational waves?

TL;DR

This paper extends the analysis of magnetic components of gravitational waves in interferometers to full frequency dependence, showing these components grow at high frequencies and could dominate signals above 10,000 Hz, impacting detection strategies.

Contribution

It generalizes the response functions for magnetic GW components to full frequency dependence, revealing their potential dominance at high frequencies.

Findings

Response functions grow at high frequencies for magnetic components.

Magnetic components could dominate signals above 10,000 Hz.

Frequency range of interferometers could extend beyond current limits.

Abstract

Recently, with an enlighting treatment, Baskaran and Grishchuk have shown the presence and importance of the so-called ``magnetic'' components of gravitational waves (GWs), which have to be taken into account in the context of the total response functions of interferometers for GWs propagating from arbitrary directions. In this paper the analysis of the response functions for the magnetic components is generalized in its full frequency dependence, while in the work of Baskaran and Grishchuk the response functions were computed only in the approximation of wavelength much larger than the linear dimensions of the interferometer. It is also shown that the response functions to the magnetic components grow at high frequencies, differently from the values of the response functions to the well known ordinary components that decrease at high frequencies. Thus the magnetic components could in principle become the dominant part of the signal at high frequencies. This is important for a potential detection of the signal at high frequencies and confirms that the magnetic contributions must be taken into account in the data analysis. More, the fact that the response functions of the magnetic components grow at high frequencies shows that, in principle, the frequency-range of Earth-based interferometers could extend to frequencies over 10000 Hz.