Zobrazeno 1 - 10
of 783
pro vyhledávání: '"Niemi, A. J."'
Methods of local topology are introduced to the field of protein physics. This is achieved by explaining how the folding and unfolding processes of a globular protein alter the local topology of the protein's C-alpha backbone through conformational b
Externí odkaz:
http://arxiv.org/abs/2405.06348
Cats use the connection governing parallel transport in the space of shapes to land safely on their feet. Here we argue that this connection also explains the impressive performance of molecular motors by enabling molecules to evade conclusions of Fe
Externí odkaz:
http://arxiv.org/abs/2304.12118
Autor:
Niemi, Antti J.
A Hamiltonian time crystal can emerge when a Noether symmetry is subject to a condition that prevents the energy minimum from being a critical point of the Hamiltonian. A somewhat trivial example is the Schr\"odinger equation of a harmonic oscillator
Externí odkaz:
http://arxiv.org/abs/2109.06091
Autor:
Garaud, Julien, Niemi, Antti J.
Publikováno v:
J. High Energ. Phys. 2022, 154 (2022)
A dilute gas of Bose-Einstein condensed atoms in a non-rotated and axially symmetric harmonic trap is modelled by the time dependent Gross-Pitaevskii equation. When the angular momentum carried by the condensate does not vanish, the minimum energy st
Externí odkaz:
http://arxiv.org/abs/2108.03155
Autor:
Niemi, Heikki J., Suihko, Satu, Kylmälä, Minna, Rajala, Helena, Syväranta, Suvi, Kivistö, Sari, Lommi, Jyri
Publikováno v:
In The American Journal of Cardiology 15 January 2024 211:122-129
Publikováno v:
J. High Energ. Phys. 2021, 157 (2021)
Vortices in a Bose-Einstein condensate are modelled as spontaneously symmetry breaking minimum energy solutions of the time dependent Gross-Pitaevskii equation, using the method of constrained optimization. In a non-rotating axially symmetric trap, t
Externí odkaz:
http://arxiv.org/abs/2010.04549
A deformable body can rotate even with no angular momentum, simply by changing its shape. A good example is a falling cat, how it maneuvers in air to land on its feet. Here a first principles molecular level example of the phenomenon is presented. Fo
Externí odkaz:
http://arxiv.org/abs/2009.07731
We focus on a Hamiltonian system with a continuous symmetry, and dynamics that takes place on a presymplectic manifold. We explain how the symmetry can become spontaneously broken by a time crystal, that we define as the minimum of the available mech
Externí odkaz:
http://arxiv.org/abs/2005.00586
Classical Hamiltonian systems with conserved charges and those with constraints often describe dynamics on a pre-symplectic manifold. Here we show that a pre-symplectic manifold is also the proper stage to describe autonomous energy conserving Hamilt
Externí odkaz:
http://arxiv.org/abs/2002.07023
Autor:
Howe, Robert W., Niemi, Gerald J., Bracey, Annie M., Brady, Valerie, Elliott, Lisa, Fiorino, Giuseppe E., Gaul, Willson, Gehring, Thomas M., Gnass Giese, Erin E., Lawrence, Gregory, Norment, Christopher J., Panci, Hannah, Tozer, Douglas C., Uzarski, Donald, Walton, Nicholas G., Wheelock, Bridget
Publikováno v:
In Ecological Indicators 1 December 2023 156