Lukewarm praise for effort

Independence-supportive Praise versus Interdependence-promoting Praise

Massive Hidden Photons as Lukewarm Dark Matter

We study the possibility that a keV-MeV mass hidden photon (HP), i.e. a hidden sector U(1) gauge boson, accounts for the observed amount of dark matter. We focus on the case where the HP interacts with the standard model sector only through kinetic mixing with the photon. The relic abundance is computed including all relevant plasma effects into the photon’s self-energy, which leads to a resona...

Action and entropy of lukewarm black holes

We calculate the Euclidean actions and the entropies of lukewarm black holes, cold black holes and ultracold solutions in the Einstein-Maxwell theory with a positive cosmological constant. We find that the entropy of lukewarm black holes is sum of entropies of black hole horizon and cosmological horizon. The entropy of cold black holes is only one quarter area of cosmological horizon, and the e...

In praise of petroleum?

Among other difficulties (1), the World Summit on Sustainable Development -Rio+10 struggled with defining “sustainability.” Typical of efforts to make concrete this slippery concept was a preparatory paper addressing one of the most pressing issues in human development, how to bring modern energy services to the one-third of humanity whose development and survival requirements suffer from lack ...

In praise of deaneries.

If you look at the foot of this article, you will see that my address is given as the London Deanery. This is possibly appearing there for the last time. I am not retiring just yet, but the structure of our institution is about to change, and possibly the name will do so too. This gives me an opportunity to write about deaneries, and why they have been such a force for good. In case you are uns...