Adolfo Maia

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We investigate a possible difference between the effective potential and zero-point energy. We define the zero-point ambiguity (ZPA) as the difference between these two definitions of vacuum energy. Using the zeta function technique in order to obtain renormalized quantities, we show that ZPA vanishes, implying that both of the above definitions of vacuum(More)
A mathematical model for interactive sound synthesis based on the application of Genetic Algorithms (GA) is presented. The Evolutionary Sound Synthesis Method (ESSynth) generates sequences of waveform variants by the application of genetic operators on an initial population of waveforms. We describe how the waveforms can be treated as genetic code, the(More)
Two implementations of an Evolutionary Sound Synthesis method using the Interaural Time Difference (ITD) and psychoacoustic descriptors are presented here as a way to develop criteria for fitness evaluation. We also explore a relationship between adaptive sound evolution and three soundscape characteristics: keysounds, key-signals and sound-marks. Sonic(More)
This paper presents a new model for measuring similarity in a general Rhythm Space. Similarity is measured by establishing a comparison between subsequences of a given rhythm. We introduce the hierarchical subdivision of rhythm sequences in several levels, and compute a Distance Matrix for each level using the “block distance”. The information about the(More)
A new way to control sound spatial dispersion using the ESSynth Method is introduced here. The Interaural Time Difference (ITD) is used as genotype of an evolutionary control of sound spatialization. Sound intensity and the ITD azimuth angle are used to define spatial dispersion and spatial similarity. Experimental results where crossover and mutation rates(More)
We give an example in which it is possible to understand quantum statistics using classical concepts. This is done by studying the interaction of charged matter oscillators with the thermal and zeropoint electromagnetic fields characteristic of quantum electrodynamics and classical stochastic electrodynamics. Planck’s formula for the spectral distribution(More)
The calculation of the minimum of the effective potential using the zeta function method is extremely advantagous, because the zeta function is regular at s = 0 and we gain immediately a finite result for the effective potential without the necessity of subtratction of any pole or the addition of infinite counter-terms. The purpose of this paper is to(More)
We study the behavior of bound energy levels for the case of two classical interacting fields φ and χ in a finite domain (box) in (1 + 1) dimension on which we impose Dirichlet boundary conditions (DBC). The total Lagrangian contain a λ 4 φ self-interaction and an interaction term given by gφχ. We calculate the energy eigenfunctions and its correspondent(More)