90 research outputs found
Operator Mixing and the BMN Correspondence
In this note we update the discussion of the BMN correspondence and string interactions in hep-th/0205089 to incorporate the effects of operator mixing. We diagonalize the matrix of two point functions of single and double trace operators, and compute the eigen-operators and their anomalous dimensions to order g_2^2 \lambda'. Surprisingly, operators in different R symmetry multiplets remain degenerate at this order. We also calculate the corresponding energy shifts in string theory, and find a discrepancy with field theory results, indicating possible new effects in light-cone string field theory
British signals intelligence and the 1916 Easter Rising in Ireland
Historians for decades have placed Room 40, the First World War British naval signals intelligence organization, at the centre of narratives about the British anticipation of and response to the Easter Rising in Ireland in 1916. A series of crucial decrypts of telegrams between the German embassy in Washington and Berlin, it has been believed, provided significant advance intelligence about the Rising before it took place. This article upends previous accounts by demonstrating that Room 40 possessed far less advance knowledge about the Rising than has been believed, with most of the supposedly key decrypts not being generated until months after the Rising had taken place
The afterlife of colonial radio in Christian missionary broadcasting of the Philippines
The article explores Christian missionary radio broadcasting as part of a wider sonic colonization of the Philippines under US colonial rule. Specifically, I explore how some post-Second World War faith-based broadcasters shaped the listening practices of Filipino audiences through programming tactics such as blocktiming. Furthermore, I consider how missionary broadcasters cultivated direct relationships with listeners through the imagined âshared experiencesâ of aural space. As a case study, I explore the activities of the US-based Far East Broadcasting Company (FEBC), which began its operations in the Philippines in 1948. Since then, the organization has used the country as a hub for its expanding domestic and international radio network, which now includes broadcasts to South East Asia, China and other parts of the world. In addition to exploring how FEBCâs localized approach to programming has cultivated specific listening audiences, I explore how programmes have been received by listeners in the Philippines, many of whom continue to tune in via terrestrial radio
Confinement, phase transitions and non-locality in the entanglement entropy
In this paper we study the conjectural relation between confinement in a
quantum field theory and the presence of a phase transition in its
corresponding entanglement entropy. We determine the sufficient conditions for
the latter and compare to the conditions for having a confining Wilson line. We
demonstrate the relation in several examples. Superficially, it may seem that
certain confining field theories with a non-local high energy behaviour, like
the dual of D5 branes wrapping a two-cycle, do not admit the corresponding
phase transition. However, upon closer inspection we find that, through the
introduction of a regulating UV-cutoff, new eight-surface configurations
appear, that satisfy the correct concavity condition and recover the phase
transition in the entanglement entropy. We show that a local-UV-completion to
the confining non-local theories has a similar effect to that of the
aforementioned cutoff.Comment: 64 pages. Lots of figure
- âŠ