The Laser Interferometer Space Antenna mission in Greece White Paper

Abstract

The Laser Interferometer Space Antenna (LISA) mission, scheduled for launch in the mid-2030s, is a gravitational wave observatory in space designed to detect sources emitting in the millihertz band. LISA is an ESA flagship mission, currently entering the Phase B development phase. It is expected to help us improve our understanding about our Universe by measuring gravitational wave sources of different types, with some of the sources being at very high redshifts z ∼ 20. On the 23rd of February 2022 we organized the 1 st LISA in Greece Workshop. This workshop aimed to inform the Greek scientific and tech industry community about the possibilities of participating in LISA science and LISA mission, with the support of the Hellenic Space Center (HSC). In this white paper, we summarize the outcome of the workshop, the most important aspect of it being the inclusion of 15 Greek researchers to the LISA Consortium, raising our total number to 22. At the same time, we present a road-map with the future steps and actions of the Greek Gravitational Wave community with respect to the future LISA mission.https://indico.physics.auth.gr/event/11/ a. The shape and organization of this document, have been inspired by the work of our Canadian Colleagues.

Primordial black holes and gravitational waves from non-canonical inflation

“…In figure 7, we depict the GW spectra today for α = 1.3 and α = 1.5 as a function of their frequency defined as f = k/(2πa 0 ) with a 0 = 1 and for the model-parameters present in table 1. We have superimposed as well the GW sensitivity curves of the Square Kilometer Array (SKA) [125], Laser Space Inferometer Antenna (LISA) [126,127], Einstein Telscope (ET) [128] and Big Bang Observer (BBO) [129]. Interestingly, for α = 1.5 the peak frequency of the SIGW signal enters the LISA and BBO GW sensitivity bands whereas for α = 1.3 the GW signal enters primarily within the SKA sensitivity with its tail slightly crossing the BBO curve.…”

Extreme mass ratio inspirals in galaxies with dark matter halos

“…The ground-based GW observatories are only sensitive to GWs in the frequency range of 10 − 10 3 Hz. The space-based GW observatories such as LISA [7], TianQin [8] and Taiji [9,10] will usher a new era in GW astronomy due to their unprecedented accuracy and their sensitive range of mHz [11][12][13][14]. One particular interesting target of space-based (MBH), the extreme mass ratio inspirals (EMRIs) [15].…”