112 research outputs found
Galilean covariant harmonic oscillator
A Galilean covariant approach to classical mechanics of a single particle is described. Within the proposed formalism, all non-covariant force laws defining acting forces which become to be defined covariantly by some differential equations are rejected. Such an approach leads out of the standard classical mechanics and gives an example of non-Newtonian mechanics. It is shown that the exactly solvable linear system of differential equations defining forces contains the Galilean covariant description of harmonic oscillator as its particular case. Additionally, it is demonstrated that in Galilean covariant classical mechanics the validity of the second Newton law of dynamics implies the Hooke law and vice versa. It is shown that the kinetic and total energies transform differently with respect to the Galilean transformations
An exciton-polariton laser based on biologically produced fluorescent protein
Under adequate conditions, cavity-polaritons form a macroscopic coherent
quantum state, known as Bose-Einstein condensate (BEC). Compared to
Wannier-Mott excitons in inorganic semiconductors, the localized Frenkel
excitons in organic emitter materials show weaker interaction but stronger
coupling, which recently enabled the first realization of BEC at room
temperature. However, this required ultrafast optical pumping which limits the
applications of organic BECs. Here, we demonstrate room-temperature BEC of
cavity-polaritons in simple laminated microcavities filled with the
biologically produced enhanced green fluorescent protein (eGFP). The unique
molecular structure of eGFP prevents exciton annihilation even at high
excitation densities, thus facilitating BEC under conventional nanosecond
pumping. BEC is clearly evidenced by a distinct threshold, an
interaction-induced blueshift of the condensate, long-range coherence and the
presence of a second threshold at higher excitation density which is associated
with the onset of photon lasing and results from thermalization of the exciton
reservoir.Comment: 13(+8) pages, 4(+7) figure
A quantum vocal theory of sound
Concepts and formalism from acoustics are often used to exemplify quantum mechanics. Conversely, quantum mechanics could be used to achieve a new perspective on acoustics, as shown by Gabor studies. Here, we focus in particular on the study of human voice, considered as a probe to investigate the world of sounds. We present a theoretical framework that is based on observables of vocal production, and on some measurement apparati that can be used both for analysis and synthesis. In analogy to the description of spin states of a particle, the quantum-mechanical formalism is used to describe the relations between the fundamental states associated with phonetic labels such as phonation, turbulence, and supraglottal myoelastic vibrations. The intermingling of these states, and their temporal evolution, can still be interpreted in the Fourier/Gabor plane, and effective extractors can be implemented. The bases for a quantum vocal theory of sound, with implications in sound analysis and design, are presented
2018 Summer Research Symposium Abstract Book
2018 Summer volume of abstracts for science research projects conducted by students at Trinity College
Safe and Sound: Proceedings of the 27th Annual International Conference on Auditory Display
Complete proceedings of the 27th International Conference on Auditory Display (ICAD2022), June 24-27. Online virtual conference
Beyond Quantum Music | 2019-2022
Beyond Quantum Music is a project exploring the connection
between art and quantum physics. Its main purpose is broadening and
developing productional, educational and artistic aspects of the pilot
project Quantum Music, completed in 2018 – however, this time not
only in the domain of music but also in visual and digital arts. The
primary goal of the new consortium is audience development in three
partner countries, but also in the broader European context
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