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Anxo Biasi

As seen in: Physical Review B
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Articles by Anxo Biasi

Exact solutions for a coherent phenomenon of condensation in conservative Hamiltonian systems

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By Anxo Biasi
| Physical Review B
While it is known that Hamiltonian systems may undergo a phenomenon of condensation akin to Bose-Einstein condensation, not all the manifestations of this phenomenon have been uncovered yet. In this work, we present a novel form of condensation in conservative Hamiltonian systems that stands out due to its evolution through highly coherent states. The result is based on a deterministic approach to obtain exact explicit solutions representing the dynamical formation of condensates in finite time.
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Obstruction to ergodicity in nonlinear Schr\"odinger equations with resonant potentials

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By Anxo Biasi, Oleg Evnin
| Physical Review B
We identify a class of trapping potentials in cubic nonlinear Schrödinger equations (NLSEs) that make them nonintegrable, but prevent the emergence of power spectra associated with ergodicity. The potentials are characterized by equidistant energy spectra (e.g., the harmonic-oscillator trap), which give rise to a large number of resonances enhancing the nonlinearity.
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de Sitter Bubbles from Anti--de Sitter Fluctuations

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By Anxo Biasi, Oleg Evnin
| Physical Review B
Abstract Cosmological acceleration is difficult to accommodate in theories of fundamental interactions involving supergravity and superstrings. An alternative is that the acceleration is not universal but happens in a large localized region, which is possible in theories admitting regular black holes with de Sitter–like interiors.
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