Now showing items 1-20 of 18687

    • N=4 Scattering Amplitudes and the Deformed Grassmannian 

      Ferro, Livia; Lukowski, Tomasz; Staudacher, Matthias (2014-12-01)
      Some time ago the general tree-level scattering amplitudes of N=4 Super Yang-Mills theory were expressed as certain Grassmannian contour integrals. These remarkable formulas allow to clearly expose the super-conformal, ...
    • Spectral Parameters for Scattering Amplitudes in N=4 Super Yang-Mills Theory 

      Ferro, Livia; Lukowski, Tomasz; Meneghelli, Carlo; Plefka, Jan; Staudacher, Matthias (2014-01-17)
      Planar N=4 Super Yang-Mills theory appears to be a quantum integrable four-dimensional conformal theory. This has been used to find equations believed to describe its exact spectrum of anomalous dimensions. Integrability ...
    • Lessons from crossing symmetry at large N 

      Alday, Luis F.; Bissi, Agnese; Lukowski, Tomasz (2015-06-12)
      We consider the four-point correlator of the stress tensor multiplet in N=4 SYM. We construct all solutions consistent with crossing symmetry in the limit of large central charge c ~ N^2 and large g^2 N. While we find an ...
    • A Shortcut to General Tree-level Scattering Amplitudes in N=4 SYM via Integrability 

      Kanning, Nils; Lukowski, Tomasz; Staudacher, Matthias (2014-03-13)
      We combine recent applications of the two-dimensional quantum inverse scattering method to the scattering amplitude problem in four-dimensional N=4 Super Yang-Mills theory. Integrability allows us to obtain a general, ...
    • Use of bioresorbable vascular scaffold : a meta-analysis of patients with coronary artery disease 

      Farag, Mohamed; Spinthakis, Nikolaos; Gorog, Diana A; Prasad, Abhiram; Sullivan, Keith; Akhtar, Zaki; Kukreja, Neville; Srinivasan, Manivannan (2016-08-26)
      BACKGROUND: Differences in outcomes between bioresorbable vascular scaffold (BVS) systems and drug-eluting metal stents (DES) have not been fully evaluated. We aimed to compare clinical and angiographic outcomes in randomised ...
    • Tree-level scattering amplitudes from the amplituhedron 

      Ferro, Livia; Lukowski, Tomasz; Orta, Andrea; Parisi, Matteo (2017-06-07)
      A central problem in quantum field theory is the computation of scattering amplitudes. However, traditional methods are impractical to calculate high order phenomenologically relevant observables. Building on a few decades ...
    • Perturbative Four-Point Functions from the Analytic Conformal Bootstrap 

      Henriksson, Johan; Lukowski, Tomasz (2018-02-20)
      We apply the analytic conformal bootstrap method to study weakly coupled conformal gauge theories in four dimensions. We employ twist conformal blocks to find the most general form of the one-loop four-point correlation ...
    • Large spin systematics in CFT 

      Alday, Luis F.; Bissi, Agnese; Lukowski, Tomasz (2015-11-16)
      Using conformal field theory (CFT) arguments we derive an infinite number of constraints on the large spin expansion of the anomalous dimensions and structure constants of higher spin operators. These arguments rely only ...
    • Yangian Symmetry for the Tree Amplituhedron 

      Ferro, Livia; Lukowski, Tomasz; Orta, Andrea; Parisi, Matteo (2017-06-29)
      Tree-level scattering amplitudes in planar N=4 super Yang-Mills are known to be Yangian-invariant. It has been shown that integrability allows to obtain a general, explicit method to find such invariants. The uplifting of ...
    • Expanding the Bethe/Gauge Dictionary 

      Bullimore, Mathew; Kim, Hee-Cheol; Lukowski, Tomasz (2017-11-09)
      We expand the Bethe/Gauge dictionary between the XXX Heisenberg spin chain and 2d N = (2,2) supersymmetric gauge theories to include aspects of the algebraic Bethe ansatz. We construct the wave functions of off-shell Bethe ...
    • Revisiting N=4 superconformal blocks 

      Bissi, Agnese; Lukowski, Tomasz (2016-02-17)
      We study four-point correlation functions of four generic half-BPS supermultiplets of N=4 SCFT in four dimensions. We use the two-particle Casimir of four-dimensional superconformal algebra to derive superconformal blocks ...
    • Towards the Amplituhedron Volume 

      Ferro, Livia; Lukowski, Tomasz; Orta, Andrea; Parisi, Matteo (2016-03-03)
      It has been recently conjectured that scattering amplitudes in planar N=4 super Yang-Mills are given by the volume of the (dual) amplituhedron. In this paper we show some interesting connections between the tree-level ...
    • Para-cresol production by Clostridium difficile affects microbial diversity and membrane integrity of Gram-negative bacteria 

      Passmore, Ian J; Letertre, Marine P M; Preston, Mark D; Bianconi, Irene; Harrison, Mark A; Nasher, Fauzy; Kaur, Harparkash; Hong, Huynh A; Baines, Simon D; Cutting, Simon M; Swann, Jonathan R; Wren, Brendan W; Dawson, Lisa F (2018-09-12)
      Clostridium difficile is a Gram-positive spore-forming anaerobe and a major cause of antibiotic-associated diarrhoea. Disruption of the commensal microbiota, such as through treatment with broad-spectrum antibiotics, is a ...
    • Ambulatory function in spinal muscular atrophy : Age-related patterns of progression 

      Montes, Jacqueline; McDermott, Michael P; Mirek, Elizabeth; Mazzone, Elena S; Main, Marion; Glanzman, Allan M; Duong, Tina; Young, Sally Dunaway; Salazar, Rachel; Pasternak, Amy; Gee, Richard; De Sanctis, Roberto; Coratti, Giorgia; Forcina, Nicola; Fanelli, Lavinia; Ramsey, Danielle; Milev, Evelin; Civitello, Matthew; Pane, Marika; Pera, Maria Carmela; Scoto, Mariacristina; Day, John W; Tennekoon, Gihan; Finkel, Richard S; Darras, Basil T; Muntoni, Francesco; De Vivo, Darryl C; Mercuri, Eugenio (2018-06-26)
      Individuals with spinal muscular atrophy (SMA) type 3 are able to walk but they have weakness, gait impairments and fatigue. Our primary study objective was to examine longitudinal changes in the six-minute walk test (6MWT) ...
    • Modules for Automated Validation and Comparison of Models of Neurophysiological and Neurocognitive Biomarkers of Psychiatric Disorders: ASSRUnit - A Case Study Computational Psychiatry 

      Metzner, Christoph; Maeki-Marttunen, Tuomo; Zurowski, Bartosz; Steuber, Volker (2018-07-23)
      The characterisation of biomarkers and endophenotypic measures has been a central goal of research in psychiatry over the last years. While most of this research has focused on the identification of biomarkers and ...
    • Comparison of bioavailability and antiplatelet action of ticagrelor in patients with ST-elevation myocardial infarction and non-ST-elevation myocardial infarction : A prospective, observational, single-centre study 

      Adamski, Piotr; Sikora, Joanna; Laskowska, Ewa; Buszko, Katarzyna; Ostrowska, Małgorzata; Umińska, Julia M; Sikora, Adam; Skibińska, Natalia; Sobczak, Przemysław; Adamska, Urszula; Rość, Danuta; Kubica, Aldona; Paciorek, Przemysław; Marszałł, Michał P; Navarese, Eliano P; Gorog, Diana A; Kubica, Jacek (2017-10-12)
      BACKGROUND: Data from available studies suggest that the presence of ST-elevation myocardial infarction (STEMI) may be associated with delayed and attenuated ticagrelor bioavailability and effect compared with non-ST-elevation ...
    • The Mindedness of Maternal Touch: : An Investigation of Maternal Mind-Mindedness and Mother-Infant Touch Interactions 

      Crucianelli, Laura; Wheatley, Lisa; Filippetti, Maria Laura; Kirk, Elizabeth; Jenkinson, Paul; Fotopoulou, Aikaterini (2018-01-31)
      Increasing evidence shows that maternal touch may promote emotion regulation in infants, however less is known about how parental higher-order social cognition abilities are translated into tactile, affect-regulatory ...
    • The benefits of in silico modelling to identify possible small molecule drugs and their off-target interactions 

      Zloh, Mire; Kirton, Stewart (2018-02-01)
      The research into the use of small molecules as drugs continues to be a key driver in the development of molecular databases, computer-aided drug design software and collaborative platforms. The evolution of computational ...
    • The Bank of England and the genesis of modern management 

      Murphy, Anne L. (European Association for Banking and Financial History, 2016-08-15)
      In 1965 Sidney Pollard published The Genesis of Modern Management, an extended discussion of the problems, during Britain’s initial period of industrialisation, of the ‘internal management’ of the firm. But, in his focus ...
    • Managing Faecal Incontinence in people with advanced dementia resident in Care Homes (FINCH) study: a realist synthesis of the evidence 

      Goodman, Claire (Health Services and Delivery Research, NIHR, 2017-08-14)
      Background Eighty per cent of care home residents in the UK are living with dementia. The prevalence of faecal incontinence (FI) in care homes is estimated to range from 30% to 50%. There is limited evidence of what is ...