13,468 research outputs found
Analysis for time discrete approximations of blow-up solutions of semilinear parabolic equations
We prove a posteriori error estimates for time discrete approximations, for semilinear parabolic equations with solutions that might blow up in finite time. In particular we consider the backward Euler and the CrankāNicolson methods. The main tools that are used in the analysis are the reconstruction technique and energy methods combined with appropriate fixed point arguments. The final estimates we derive are conditional and lead to error control near the blow up time
Undoing the market : corporate sponsorship and activist protests at Tate Galleries
This article focuses on activist group Liberate Tateās online performance-based protests against BPās (Beyond Petroleum) sponsorship of Tate Galleries in London. Their life protests took place at one of Londonās Tate Galleries, either Tate Britain or Tate Modern (2010-2016), and were recorded, edited and posted online on the groupās website. The article conceptualises the protests as interaction rituals (Collins, 2001); collective gatherings characterised by their group assembly, a shared focus of attention including an object/symbol and the creation of barriers to outsiders. If successful, they can lead to the production of group identity, and emotional energy, feelings of confidence, of enthusiasm, that translate into a desire for action, and collective, group symbols (Collins, 2001). The article draws upon and critiques Collinsā perspective, arguing for the importance of embodiment and the online environment of protests in understanding their ability to produce emotional energy and collective identity
Exploring sizable triple Higgs couplings in the 2HDM
An important task at future colliders is the measurement of the triple Higgs
coupling. Depending on its size relative to the Standard Model (SM) value,
certain collider options result in a higher experimental accuracy. Within the
framework of Two Higgs Doublet Models (2HDM) type I and II we investigate the
allowed ranges for all triple Higgs couplings involving at least one light,
SM-like Higgs boson. We take into account theoretical constraints (unitarity,
stability), experimental constraints from direct Higgs-boson searches,
measurements of the SM-like Higgs-boson properties, flavor observables and
electroweak precision data. We find that the SM-type triple Higgs coupling
w.r.t. its SM value, , can range between and . Depending on which value is realized, the HL-LHC can
compete with, or is clearly inferior to the ILC. We find the coupling
between and . Triple Higgs couplings
involving two heavy Higgs bosons, , and
can reach values up to , roughly independent
of the 2HDM type. This can lead to potentially strongly enhanced production of
two Higgs-bosons at the HL-LHC or high-energy colliders.Comment: 44 pages, 16 figure
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