12,824 research outputs found
Observational consequences of an interacting multiverse
The observability of the multiverse is at the very root of its physical
significance as a scientific proposal. In this conference we present, within
the third quantization formalism, an interacting scheme between the wave
functions of different universes and analyze the effects of some particular
values of the coupling function. One of the main consequences of the
interaction between universes can be the appearance of a pre-inflationary stage
in the evolution of the universes that might leave observable consequences in
the properties of the CMB.Comment: 8 pages, 4 figures. Proceedings of the conference given in the
Varying Constants and Fundamental Cosmology meeting (VARCOSMOFUN-16) held in
Szczecin, Poland, 12-17th September 201
I-V characteristics of in-plane and out-of-plane strained edge-hydrogenated armchair graphene nanoribbons
The effects of tensile strain on the current-voltage (I-V) characteristics of
hydrogenated-edge armchair graphene nanoribbons (HAGNRs) are investigated by
using DFT theory. The strain is introduced in two different ways related to the
two types of systems studied in this work: in-plane strained systems (A), and
out-of-plane strained systems due to bending (B). These two kinds of strain
lead to make a distinction among three cases: in-plane strained systems with
strained electrodes (A1) and with unstrained electrodes (A2), and out-of-plane
homogeneously strained systems with unstrained, fixed electrodes (B). The
systematic simulations to calculate the electronic transmission between two
electrodes were focused on systems of 8 and 11 dimers in width. The results
show that the differences between cases A2 and B are negligible, even though
the strain mechanisms are different: in the plane case, the strain is uniaxial
along its length, while in the bent case the strain is caused by the arc
deformation. Based on the study, a new type of NEMS-solid state switching
device is proposed.Comment: 22 pages, 7 figure
Dynamic Discrete Choice and Dynamic Treatment Effects
This paper considers semiparametric identification of structural dynamic discrete choice models and models for dynamic treatment effects. Time to treatment and counterfactual outcomes associated with treatment times are jointly analyzed. We examine the implicit assumptions of the dynamic treatment model using the structural model as a benchmark. For the structural model we show the gains from using cross equation restrictions connecting choices to associated measurements and outcomes. In the dynamic discrete choice model, we identify both subjective and objective outcomes, distinguishing ex post and ex ante outcomes. We show how to identify agent information sets.
Solvability of the Dirichlet, Neumann and the regularity problems for parabolic equations with H\"older continuous coefficients
We establish the -solvability of Dirichlet, Neumann and regularity
problems for divergence-form heat (or diffusion) equations with
H\"older-continuous diffusion coefficients, on bounded Lipschitz domains in
. This is achieved through the demonstration of invertibility of
the relevant layer-potentials which is in turn based on Fredholm theory and a
new systematic approach which yields suitable parabolic Rellich-type estimates
Transference of local to global maximal estimates for dispersive partial differential equations
In this paper we give an elementary proof for transference of local to global
maximal estimates for dispersive PDEs. This is done by transferring local
estimates for certain oscillatory integrals with rough phase functions, to the
corresponding global estimates. The elementary feature of our approach is that
it entirely avoids the use of the wave packet techniques which are quite common
in this context, and instead is based on scalings and classical oscillatory
integral estimates.Comment: 10 page
- …