Ireland and the global economic crisis: one island, two different experiences

In this chapter, Ó hAdhmaill argues that responses to the global economic crisis which emerged in 2008 reflected a dominant ideological discourse, with ‘austerity’ being a tool in a wider agenda to reassert neoliberalist thinking in the global economy and welfare provision in the richer countries. In Ireland, North and South, however, the experience of, and responses to, the crisis and ‘austerity’ were different, reflecting different social, economic, and political contexts and influences, as well as different levels of democratic control. Ó hAdhmaill outlines some of these differences and argues that, while democratic control in smaller jurisdictions may be limited by the ‘real rulers’ of the world, global capital, people still have ‘agency’ and do not have to be mere passive observers of unfolding events.

Effects of spin on high-energy radiation from accreting black holes

Observations of jets in X-ray binaries show a correlation between radio power and black hole spin. This correlation, if confirmed, points toward the idea that relativistic jets may be powered by the rotational energy of black holes. In order to examine this further, we perform general relativistic radiative transport calculations on magnetically arrested accretion flows, which are known to produce powerful jets via the Blandfordâ Znajek (BZ) mechanism. We find that the X-ray and γ-ray emission strongly depend on spin and inclination angle. Surprisingly, the high-energy power does not show the same dependence on spin as the BZ jet power, but instead can be understood as a redshift effect. In particular, photons observed perpendicular to the spin axis suffer little net redshift until originating from close to the horizon. Such observers see deeper into the hot, dense, highly magnetized inner disk region. This effect is largest for rapidly rotating black holes due to a combination of frame dragging and decreasing horizon radius. While the X-ray emission is dominated by the near horizon region, the near-infrared (NIR) radiation originates at larger radii. Therefore, the ratio of X-ray to NIR power is an observational signature of black hole spin.