43 research outputs found
Adiabatically switched-on electrical bias in continuous systems, and the Landauer-Buttiker formula
Consider a three dimensional system which looks like a cross-connected pipe
system, i.e. a small sample coupled to a finite number of leads. We investigate
the current running through this system, in the linear response regime, when we
adiabatically turn on an electrical bias between leads. The main technical tool
is the use of a finite volume regularization, which allows us to define the
current coming out of a lead as the time derivative of its charge. We finally
prove that in virtually all physically interesting situations, the conductivity
tensor is given by a Landauer-B{\"u}ttiker type formula.Comment: 20 pages, submitte
Strict Deformation Quantization for a Particle in a Magnetic Field
Recently, we introduced a mathematical framework for the quantization of a
particle in a variable magnetic field. It consists in a modified form of the
Weyl pseudodifferential calculus and a C*-algebraic setting, these two points
of view being isomorphic in a suitable sense. In the present paper we leave
Planck's constant vary, showing that one gets a strict deformation quantization
in the sense of Rieffel. In the limit h --> 0 one recovers a Poisson algebra
induced by a symplectic form defined in terms of the magnetic field.Comment: 23 page
Magnetic calculus and semiclassical trace formulas
The aim of these notes is to show how the magnetic calculus developed in
\cite{MP, IMP1, IMP2, MPR, LMR} permits to give a new information on the nature
of the coefficients of the expansion of the trace of a function of the magnetic
Schr\"odinger operator whose existence was established in \cite{HR2}
The Free Education Project: Higher Education Funding, E2 Implementation, and Crowdsourcing Crypto Development
This short paper, written in three different sections, explores how a cryptocurrency’s issuance and network effects could fund higher education. Synthesizing research from the Bronx Community College Cryptocurrency Research Lab, Bernard Lietaer’s notion of creating money for the needs of society, lessons learned by Galia Benartzi and the Hearts Project, and an exploration of how communities coalesce around open-source cryptocurrency projects, the authors provide an overview of the problem of funding higher education, the ways in which money that is needed could be created, and the key components to building a highly effective developer community. These three distinct yet vitally interconnected facets lay the groundwork for the Free Education Project. Lastly, based on the models herein, this paper calls for academics, entrepreneurs, and financial professionals to work together in ways that facilitate and generate the needed capital, built outside of taxation, to fund the noble purposes of education writ large
Perturbation Theory and Control in Classical or Quantum Mechanics by an Inversion Formula
We consider a perturbation of an ``integrable'' Hamiltonian and give an
expression for the canonical or unitary transformation which ``simplifies''
this perturbed system. The problem is to invert a functional defined on the
Lie- algebra of observables. We give a bound for the perturbation in order to
solve this inversion. And apply this result to a particular case of the control
theory, as a first example, and to the ``quantum adiabatic transformation'', as
another example.Comment: Version 8.0. 26 pages, Latex2e, final version published in J. Phys.
The Free Education Project: Higher Education Funding, E2 Implementation, and Crowdsourcing Crypto Development
This short paper, written in three different sections, explores how a cryptocurrency’s issuance and network effects could fund higher education. Synthesizing research from the Bronx Community College Cryptocurrency Research Lab, Bernard Lietaer’s notion of creating money for the needs of society, lessons learned by Galia Benartzi and the Hearts Project, and an exploration of how communities coalesce around open-source cryptocurrency projects, the authors provide an overview of the problem of funding higher education, the ways in which money that is needed could be created, and the key components to building a highly effective developer community. These three distinct yet vitally interconnected facets lay the groundwork for the Free Education Project. Lastly, based on the models herein, this paper calls for academics, entrepreneurs, and financial professionals to work together in ways that facilitate and generate the needed capital, built outside of taxation, to fund the noble purposes of education writ large
Adiabatic non-equilibrium steady states in the partition free approach
Consider a small sample coupled to a finite number of leads, and assume that
the total (continuous) system is at thermal equilibrium in the remote past. We
construct a non-equilibrium steady state (NESS) by adiabatically turning on an
electrical bias between the leads. The main mathematical challenge is to show
that certain adiabatic wave operators exist, and to identify their strong limit
when the adiabatic parameter tends to zero. Our NESS is different from, though
closely related with the NESS provided by the Jak{\v s}i{\'c}-Pillet-Ruelle
approach. Thus we partly settle a question asked by Caroli {\it et al} in 1971
regarding the (non)equivalence between the partitioned and partition-free
approaches
TIA1 Mutations in Amyotrophic Lateral Sclerosis and Frontotemporal Dementia Promote Phase Separation and Alter Stress Granule Dynamics.
Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are age-related neurodegenerative disorders with shared genetic etiologies and overlapping clinical and pathological features. Here we studied a novel ALS/FTD family and identified the P362L mutation in the low-complexity domain (LCD) of T cell-restricted intracellular antigen-1 (TIA1). Subsequent genetic association analyses showed an increased burden of TIA1 LCD mutations in ALS patients compared to controls (p = 8.7 × 1