343 research outputs found
Hamiltonian mechanics is conservation of information entropy
In this work we show the equivalence between Hamiltonian mechanics and conservation of information entropy. We will show that distributions with coordinate independent values for information entropy require that the manifold on which the distribution is defined is charted by conjugate pairs (i.e.~it is a symplectic manifold). We will also show that further requiring that the information entropy is conserved during the evolution yields Hamilton's equations
Hamiltonian mechanics is conservation of information entropy
In this work we show the equivalence between Hamiltonian mechanics and conservation of information entropy. We will show that distributions with coordinate independent values for information entropy require that the manifold on which the distribution is defined is charted by conjugate pairs (i.e.~it is a symplectic manifold). We will also show that further requiring that the information entropy is conserved during the evolution yields Hamilton's equations
Risk analysis of complex hydrogen infrastructures
Developing a future sustainable refuelling station network is the next important step to establish
hydrogen as a fuel for vehicles and related services. Such stations will most likely be integrated in
existing refuelling stations and result in multi-fuel storages with a variety of fuels being delivered,
stored and distributed, as e.g. biomass based methane, ethanol, gasoline, diesel as well as the
traditional crude oil based products. Hydrogen is also in play as intermediate energy storage to secure the power supply based on large shares of fluctuating energy sources and as an intermediate to improve the quality of biomass based fuels. Therefore, hydrogen supply and distribution chains will likely not only serve to fulfil the demands of refuelling, but may also be important for the wider electrical power and fuel industries. Based on an integrated hydrogen supply and distribution network, the application of the method of “Functional modelling” is discussed in this paper to show the complexity of the coupling between power storage for electricity supply and supplying hydrogen for transportation. It will be shown how a “Functional model” can be applied for comprehensive data storage for various assessment methodologies, and how functional models could support coherent risk and sustainability (Risk Assessment, Life Cycle Assessment /Life Cycle Costing) assessments, in order to find optimal solutions for the development of the infrastructure on a regional or national level
The four postulates of quantum mechanics are three
The tensor product postulate of quantum mechanics states that the Hilbert
space of a composite system is the tensor product of the components' Hilbert
spaces. All current formalizations of quantum mechanics that do not contain
this postulate contain some equivalent postulate or assumption (sometimes
hidden). Here we give a natural definition of composite system as a set
containing the component systems and show how one can logically derive the
tensor product rule from the state postulate and from the measurement
postulate. In other words, our paper reduces by one the number of postulates
necessary to quantum mechanics.Comment: 4 pages+supplementary information. Final version accepted for
publication on Phys. Rev. Let
The unphysicality of Hilbert spaces
We show that Hilbert spaces should not be considered the ``correct'' spaces
to represent quantum states mathematically. We first prove that the
requirements posited by complex inner product spaces are physically justified.
We then show that completeness in the infinite-dimensional case requires the
inclusion of states with infinite expectations, coordinate transformations that
take finite expectations to infinite ones and vice-versa, and time evolutions
that transform finite expectations to infinite ones in finite time. This makes
Hilbert spaces physically unsound as they model a potential infinity as an
actual infinity. We suspect that at least some problems in quantum theory
related to infinities may be ultimately caused by the wrong space being used.
We strongly believe a better solution can be found, and we look at Schwartz
spaces for inspiration, as, among other things, they guarantee that the
expectation of all polynomials of position and momentum are finite, guarantee
solution to the moment problem and are the only space closed under Fourier
transform.Comment: 5 pages plus mathematical appendi
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