Binary superfluids: Low-energy properties and dissipative processes from spontaneous emission of massive phonons
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866916820480425984 |
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| author | Trabucco, Silvia Lepori, Luca Chiofalo, Maria Luisa Mannarelli, Massimo |
| author_facet | Trabucco, Silvia Lepori, Luca Chiofalo, Maria Luisa Mannarelli, Massimo |
| contents | We discuss the low-energy properties of binary superfluids with density-dependent interactions. Adding an intra-species coupling that induces an explicit soft symmetry-breaking, we determine the background pressure and we show that the low-energy spectrum consists of a massless Nambu- Goldstone boson and a massive (pseudo) Nambu-Goldstone boson. When the background velocities of the two superfluids are transonic, the system is characterized by two distinct acoustic horizons: the hydrodynamic analogue of the black hole event horizon. The Hawking-like emission occurring at these horizons produces an effective friction on the fluids. We compute the viscosity-to-entropy ratios close to the two acoustic horizons, finding that the emission of pseudo Nambu-Goldstone bosons violates the bound conjectured by Kovtun, Son and Starinet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10194 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Binary superfluids: Low-energy properties and dissipative processes from spontaneous emission of massive phonons Trabucco, Silvia Lepori, Luca Chiofalo, Maria Luisa Mannarelli, Massimo High Energy Physics - Phenomenology Quantum Gases General Relativity and Quantum Cosmology Quantum Physics We discuss the low-energy properties of binary superfluids with density-dependent interactions. Adding an intra-species coupling that induces an explicit soft symmetry-breaking, we determine the background pressure and we show that the low-energy spectrum consists of a massless Nambu- Goldstone boson and a massive (pseudo) Nambu-Goldstone boson. When the background velocities of the two superfluids are transonic, the system is characterized by two distinct acoustic horizons: the hydrodynamic analogue of the black hole event horizon. The Hawking-like emission occurring at these horizons produces an effective friction on the fluids. We compute the viscosity-to-entropy ratios close to the two acoustic horizons, finding that the emission of pseudo Nambu-Goldstone bosons violates the bound conjectured by Kovtun, Son and Starinet. |
| title | Binary superfluids: Low-energy properties and dissipative processes from spontaneous emission of massive phonons |
| topic | High Energy Physics - Phenomenology Quantum Gases General Relativity and Quantum Cosmology Quantum Physics |
| url | https://arxiv.org/abs/2501.10194 |