Entanglement, Bell Inequalities and Decoherence in Particle Physics

We demonstrate the relevance of entanglement, Bell inequalities and decoherence in particle physics. In particular, we study in detail the features of the ``strange'' $K^0 \bar K^0$ system as an example of entangled meson--antimeson systems. The analogies and differences to entangled spin--1/2 or photon systems are worked, the effects of a unitary time evolution of the meson system is demonstrated explicitly. After an introduction we present several types of Bell inequalities and show a remarkable connection to CP violation. We investigate the stability of entangled quantum systems pursuing the question how possible decoherence might arise due to the interaction of the system with its ``environment''. The decoherence is strikingly connected to the entanglement loss of common entanglement measures. Finally, some outlook of the field is presented.Comment: Lectures given at Quantum Coherence in Matter: from Quarks to Solids, 42. Internationale Universit\"atswochen f\"ur Theoretische Physik, Schladming, Austria, Feb. 28 -- March 6, 2004, submitted to Lecture Notes in Physics, Springer Verlag, 45 page

The manufacture of hope : religion, eschatology and the culture of optimism

This article builds on earlier research, which concludes that societies cannot sustain themselves without cultures of optimism. These cultures are reproduced by a complex of ‘optimism promoters’, all of which can be seen to be engaged in a kind of unstated or ‘implicit’ cultural policy, with the production of optimism as one of its goals. The institution of religion is part of this complex. Its role in the production of optimism is the focus of this article, with particular reference to soteriology (theories of salvation) and eschatology. From a ‘detached’ and ‘functionalist’ perspective, it analyses how religions manufacture hope through (1) the production of meaning; (2) through their models of divine justice; and (3) through theories of ultimate destiny. These matters are discussed in relation to Hinduism, Buddhism, Christianity and Islam. The article concludes that the optimisms of religion are of a quite different order from those promoted by other institutions