28,343 research outputs found
Cell Swelling by Osmosis: a Variational Approach
A very simple model for cell swelling by osmosis is introduced, resulting in
a parabolic free boundary problem. In case of radially symmetric initial
conditions, it is shown that the model can be viewed as a gradient flow
involving entropy, surface area and the Wasserstein metric. This observation is
used to construct solutions and explain the presence and nature of osmosis
Spherical Fourier Transforms on Locally Compact Quantum Gelfand Pairs
We study Gelfand pairs for locally compact quantum groups. We give an
operator algebraic interpretation and show that the quantum Plancherel
transformation restricts to a spherical Plancherel transformation. As an
example, we turn the quantum group analogue of the normaliser of SU(1,1) in
) together with its diagonal subgroup into a pair for which
every irreducible corepresentation admits at most two vectors that are
invariant with respect to the quantum subgroup. Using a -grading,
we obtain product formulae for little -Jacobi functions
Top quark pair cross section measurement at ATLAS
An accurate determination of the top quark pair production cross section at
the LHC provides a valuable check of the Standard Model. Given the high
statistics which will be available (about one top quark pair per second, at a
luminosity of 10^33 cm^-2 s^-1), this check can be performed relatively fast
after the turn on of the LHC. The prospects for measuring the total top quark
pair cross section with the ATLAS detector during the initial period of LHC
running will be presented here. The cross section is determined in the single
lepton channel and in the dilepton channel.Comment: ICHEP0
Instantaneous coherent destruction of tunneling and fast quantum state preparation for strongly pulsed spin qubits in diamond
Qubits driven by resonant strong pulses are studied and a parameter regime is
explored in which the dynamics can be solved in closed form. Instantaneous
coherent destruction of tunneling can be seen for longer pulses, whereas
shorter pulses allow a fast preparation of the qubit state. Results are
compared with recent experiments of pulsed nitrogen-vacancy center spin qubits
in diamond.Comment: 9 pages, 4 figures. Published in the special issue of Chemical
Physics in honor of Peter Hangg
The Incognito of a Thief: Johannes Climacus and the Poetics of Self-Incrimination
In this essay, I advance a reading of Philosophical Crumbs or a Crumb of Philosophy, published by Søren Kierkegaard under the pseudonym Johannes Climacus. I argue that this book is animated by a poetics of self-incrimination. Climacus keeps accusing himself of having stolen his words from someone else. In this way, he deliberately adopts the identity of a thief as an incognito. To understand this poetics of self-incrimination, I analyze the hypothetical thought-project that Climacus develops in an attempt to show what it means to go further than Socrates. In my reading, I distinguish between a Socratic and a non-Socratic conception of education, both of which rely on an incognito. Socrates takes on the maieutic incognito of an ignorant bystander in order to force his interlocutors to turn inward so that the truth that is already within them can be born. In contrast, the non-Socratic education that Climacus advances as a hypothesis relies on what I call ‘the incognito as a true form’. It is an incognito insofar as it confronts the pupils with a paradox on which the understanding runs aground. It is a true form insofar as its immediate appearance is not a disguise, but a true form. This indirect mode of communication is necessary, without it pupils will not be able to encounter a truth that is not inherent within them. Climacus’ poetics of self-incrimination, I argue, tries to repeat this indirect mode of communication by adopting the incognito of a thief as a true form
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