Between Physics and Metaphysics: A Discussion of the Status of Mind in Quantum Mechanics

2019 ◽  
pp. 31-42
Author(s):  
Raoni Wohnrath Arroyo ◽  
Jonas R. Becker Arenhart
Keyword(s):  
Quantum Mechanics ◽  
The Status

VAN DER WAALS FRICTION: A HAMILTONIAN TEST-BED

2012 ◽  
Vol 27 (15) ◽  
pp. 1260002 ◽  
Author(s):  
GABRIEL BARTON
Keyword(s):  
Heat Transfer ◽  
Quantum Mechanics ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Van Der Waals ◽  
Relative Speed ◽  
Casimir Forces ◽  
Test Bed ◽  
The Status ◽  
Two Bodies

In the van der Waals regime (neglecting relativity and retardation), we find the power P generated by friction between two Drude-modelled dissipative half-spaces, at fixed separation and relative speed u, admitting only low u and low temperatures. This requires only elementary quantum mechanics; but the results can serve as partial checks on calculations in the fully retarded Casimir regime. They also raise questions regarding (i) the frequency-distribution of P; (ii) the status of predictions about Casimir forces generally, insofar as they feature parameters like conductivities with their empirical temperature-dependence; and (iii) calculations of heat transfer, insofar as they assume fluctuations in the two bodies to be uncorrelated.

QUANTUM MECHANICS AND THE ROLE OF TIME: ARE QUANTUM SYSTEMS MARKOVIAN?

2012 ◽  
Vol 26 (27n28) ◽  
pp. 1243005 ◽  
Author(s):  
THOMAS DURT
Keyword(s):  
Quantum Mechanics ◽  
Quantum Systems ◽  
Quantum Nonlocality ◽  
Border Line ◽  
The Past ◽  
Open Questions ◽  
The Status ◽  
Alternative Theories ◽  
Time In Quantum Mechanics

The predictions of the Quantum Theory have been verified so far with astonishingly high accuracy. Despite of its impressive successes, the theory still presents mysterious features such as the border line between the classical and quantum world, or the deep nature of quantum nonlocality. These open questions motivated in the past several proposals of alternative and/or generalized approaches. We shall discuss in the present paper alternative theories that can be infered from a reconsideration of the status of time in quantum mechanics. Roughly speaking, quantum mechanics is usually formulated as a memory free (Markovian) theory at a fundamental level, but alternative, nonMarkovian, formulations are possible, and some of them can be tested in the laboratory. In our paper we shall give a survey of these alternative proposals, describe related experiments that were realized in the past and also formulate new experimental proposals.

scholarly journals Review of lattice supersymmetry and gauge-gravity duality

2015 ◽  
Vol 30 (27) ◽  
pp. 1530054 ◽  
Author(s):  
Anosh Joseph
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Quantum Mechanics ◽  
Gauge Theory ◽  
Gauge Theories ◽  
Strongly Coupled ◽  
The Status ◽  
Gauge Gravity ◽  
Gravity Duality ◽  
Insight Into

We review the status of recent investigations on validating the gauge-gravity duality conjecture through numerical simulations of strongly coupled maximally supersymmetric thermal gauge theories. In the simplest setting, the gauge-gravity duality connects systems of D0-branes and black hole geometries at finite temperature to maximally supersymmetric gauged quantum mechanics at the same temperature. Recent simulations show that nonperturbative gauge theory results give excellent agreement with the quantum gravity predictions, thus proving strong evidence for the validity of the duality conjecture and more insight into quantum black holes and gravity.

VAN DER WAALS FRICTION: A HAMILTONIAN TEST-BED

2012 ◽  
Vol 14 ◽  
pp. 16-26 ◽  
Author(s):  
GABRIEL BARTON
Keyword(s):  
Heat Transfer ◽  
Quantum Mechanics ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Van Der Waals ◽  
Relative Speed ◽  
Casimir Forces ◽  
Test Bed ◽  
The Status ◽  
Two Bodies

In the van der Waals regime (neglecting relativity and retardation), we find the power P generated by friction between two Drude-modelled dissipative half-spaces, at fixed separation and relative speed u, admitting only low u and low temperatures. This requires only elementary quantum mechanics; but the results can serve as partial checks on calculations in the fully retarded Casimir regime. They also raise questions regarding (i) the frequency-distribution of P; (ii) the status of predictions about Casimir forces generally, insofar as they feature parameters like conductivities with their empirical temperature-dependence; and (iii) calculations of heat transfer, insofar as they assume fluctuations in the two bodies to be uncorrelated.

The Foundation of Reality

2020 ◽  
Keyword(s):  
Quantum Mechanics ◽  
Quantum Gravity ◽  
Quantum Entanglement ◽  
Physical Reality ◽  
Space Time ◽  
Interpretation Of Quantum Mechanics ◽  
Space And Time ◽  
The Status ◽  
Recent Developments

Are space and time fundamental features of our world or might they emerge from something else? This volume brings together metaphysicians and philosophers of physics working on space, time, and fundamentality to address this timely question. Recent developments in the interpretation of quantum mechanics and the understanding of certain approaches to quantum gravity have led philosophers of physics to propose that space and time might be emergent rather than fundamental. But such discussions are often conducted without engagement with those working on fundamentality and related issues in contemporary metaphysics. This volume aims to correct this oversight. The diverse contributions to this volume address topics including the nature of fundamentality, the relation of space and time to quantum entanglement, and space and time in theories of quantum gravity. Only through consideration of a range of different approaches to the topic can we hope to get clear on the status of space and time in our contemporary understanding of physical reality.

scholarly journals PT -symmetric quantum electrodynamics and unitarity

2013 ◽  
Vol 371 (1989) ◽  
pp. 20120057 ◽  
Author(s):  
Kimball A Milton ◽  
E. K. Abalo ◽  
Prachi Parashar ◽  
Nima Pourtolami ◽  
J. Wagner
Keyword(s):  
Field Theory ◽  
Quantum Mechanics ◽  
Quantum Electrodynamics ◽  
Discrete Symmetry ◽  
New Approach ◽  
Higher Dimensional ◽  
The Status ◽  
Symmetric Quantum ◽  
Quantum Mechanical Systems ◽  
Invariant Quantum

More than 15 years ago, a new approach to quantum mechanics was suggested, in which Hermiticity of the Hamiltonian was to be replaced by invariance under a discrete symmetry, the product of parity and time-reversal symmetry, . It was shown that, if is unbroken, energies were, in fact, positive, and unitarity was satisfied. Since quantum mechanics is quantum field theory in one dimension—time—it was natural to extend this idea to higher-dimensional field theory, and in fact an apparently viable version of -invariant quantum electrodynamics (QED) was proposed. However, it has proved difficult to establish that the unitarity of the scattering matrix, for example, the Källén spectral representation for the photon propagator, can be maintained in this theory. This has led to questions of whether, in fact, even quantum mechanical systems are consistent with probability conservation when Green’s functions are examined, since the latter have to possess physical requirements of analyticity. The status of QED will be reviewed in this paper, as well as the general issue of unitarity.

scholarly journals Top-down causation regarding the chemistry–physics interface: a sceptical view

2011 ◽  
Vol 2 (1) ◽  
pp. 20-25 ◽  
Author(s):  
Eric R. Scerri
Keyword(s):  
Molecular Structure ◽  
Quantum Mechanics ◽  
Present Author ◽  
Downward Causation ◽  
Top Down ◽  
The Status ◽  
Sceptical View

This article examines two influential authors who have addressed the interface between the fields of chemistry and physics and have reached opposite conclusions about whether or not emergence and downward causation represent genuine phenomena. While McLaughlin concludes that emergence is impossible in the light of quantum mechanics, Hendry regards issues connected with the status of molecular structure as supporting emergence. The present author suggests that one should not be persuaded by either of these arguments and pleads for a form of agnosticism over the reality of emergence and downward causation until further studies might be carried out.

A Preliminary Case for Wave Function Realism

2021 ◽  
pp. 1-48
Author(s):  
Alyssa Ney
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Quantum Physics ◽  
Measurement Problem ◽  
Wave Functions ◽  
Philosophy Of Physics ◽  
The Status ◽  
Physics Literature ◽  
Wave Function Realism

This chapter explains the use of wave functions in quantum mechanics in order to develop a preliminary argument for wave function realism, one that is commonly found in the physics and philosophy of physics literature. It distinguishes ontological questions about the status of the wave function from the more discussed measurement problem for quantum mechanics, and explains how wave function realism is an approach to ontology that is compatible with several rival solutions to the measurement problem. The chapter then presents an initial, but not ultimately decisive, argument for wave function realism based on the ubiquity of wave function representations in quantum physics.

scholarly journals All roads lead to the Dirac quantization condition

2019 ◽  
Vol 6 (1) ◽  
pp. 102-127
Author(s):  
Pedro Aguilar
Keyword(s):  
Quantum Mechanics ◽  
Charged Particle ◽  
Magnetic Monopole ◽  
Short Review ◽  
Magnetic Monopoles ◽  
Quantization Condition ◽  
Formal Description ◽  
Mathematical Structures ◽  
Dirac Quantization ◽  
The Status

The existence of magnetic monopoles is a sufficient argument to explain the quantization of electric charge, an argument that was presented by Dirac. Regardless of the status of any search for magnetic monopoles, the formal description of the quantum mechanics of a charged particle in the field of a magnetic monopole is very rich and has increased our understanding of the mathematical structures underlying this description, as well as of its physical implications. In this short review, we present four different arguments all leading to the Dirac quantization condition, emphasizing their geometrical and topological aspects.

The study of interfacial reactions of nickel thin films on GaAs

1983 ◽  
Vol 41 ◽  
pp. 156-157
Author(s):  
L.J. Chen ◽  
Y.F. Hsieh
Keyword(s):  
Thin Films ◽  
Integrated Circuits ◽  
Interfacial Reactions ◽  
Metal Contacts ◽  
Nickel Thin Films ◽  
Thin Foils ◽  
The Status ◽  
Si Doped ◽  
Electron Microscopes

One measure of the maturity of a device technology is the ease and reliability of applying contact metallurgy. Compared to metal contact of silicon, the status of GaAs metallization is still at its primitive stage. With the advent of GaAs MESFET and integrated circuits, very stringent requirements were placed on their metal contacts. During the past few years, extensive researches have been conducted in the area of Au-Ge-Ni in order to lower contact resistances and improve uniformity. In this paper, we report the results of TEM study of interfacial reactions between Ni and GaAs as part of the attempt to understand the role of nickel in Au-Ge-Ni contact of GaAs.N-type, Si-doped, (001) oriented GaAs wafers, 15 mil in thickness, were grown by gradient-freeze method. Nickel thin films, 300Å in thickness, were e-gun deposited on GaAs wafers. The samples were then annealed in dry N2 in a 3-zone diffusion furnace at temperatures 200°C - 600°C for 5-180 minutes. Thin foils for TEM examinations were prepared by chemical polishing from the GaA.s side. TEM investigations were performed with JE0L- 100B and JE0L-200CX electron microscopes.

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