Alex Hamilton

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The Lorentzian AdS/CFT correspondence implies a map between local operators in supergravity and non-local operators in the CFT. By explicit computation we construct CFT operators which are dual to local bulk fields in the semiclassical limit. The computation is done for general dimension in global, Poincaré and Rindler coordinates. We find that the CFT(More)
BACKGROUND The school journey is often studied in relation to health outcomes in children and adolescents. Self-report is the most common measurement tool. PURPOSE To investigate the error on self-reported journey duration in adolescents, using a wearable digital camera (Microsoft SenseCam). METHODS During March-May 2011, participants (n=17; aged 13-15(More)
We develop the representation of local bulk fields in AdS by non-local operators on the boundary, working in the semiclassical limit and using AdS 2 as our main example. In global coordinates we show that the boundary operator has support only at points which are spacelike separated from the bulk point. We construct boundary operators that represent local(More)
The following unsymmetrical diphosphines have been prepared: o-C6H4(CH2PtBu2)(PR2) where R = PtBu2 (L3a); PCg (L3b); PPh2 (L3c); P(o-C6H4CH3)2 (L3d); P(o-C6H4OCH3)2 (L3e) and o-C6H4(CH2PCg)(PCg) (L3f) where PCg is 6-phospha-2,4,8-trioxa-1,3,5,7-tetramethyladamant-6-yl. Hydromethoxycarbonylation of ethene under commercially relevant conditions has been(More)
The recently constructed Lunin-Maldacena deformation of AdS5 ×S5 is known to support two inequivalent Penrose limits that lead to BPS pp-wave geometries. In this note, we construct new giant graviton solutions on these backgrounds. A detailed study of the spectra of small fluctuations about these solutions reveals a remarkably rich structure. In particular,(More)
OBJECTIVE To investigate the feasibility and acceptability of using wearable cameras as a method to capture the opportunities for food and drink purchasing/consumption that young people encounter on their regular journeys to and from school. DESIGN A qualitative study using multiple data-collection methods including wearable cameras, global positioning(More)
The complexes [Ru(Tai)Cl{=C(H)Ph}(PCy(3))] (4) and [Ru((Ph)Bai)Cl{=C(H)Ph}(PCy(3))] (5) [where Tai = HB(7-azaindolyl)(3) and (Ph)Bai = Ph(H)B(7-azaindolyl)(2)] have been prepared and structurally characterised. The borohydride unit is located in the coordination site trans to the chloride ligand in both complexes. The degree of interaction between the(More)
We show that the amount of particle production in an arbitrary cosmological background can be determined using only the late-time positive-frequency modes. We don’t refer to modes at early times, so there is no need for a Bogolubov transformation. We also show that particle production can be extracted from the Feynman propagator in an auxiliary spacetime.(More)
We present an efficient new technique for calculating the amount of particle production in a cosmological background. The expectation value of the number operator for a given momentum mode can be extracted from the Feynman propagator. We demonstrate the computational economy of the technique by applying it to various cosmologies. We also show that the(More)