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Capturing the continuous complexity of behaviour in <i>Caenorhabditis elegans</i>

Nature Physics - Δευ, 05/10/2020 - 00:00

Nature Physics, Published online: 05 October 2020; doi:10.1038/s41567-020-01036-8

Animal behaviour is characterized by repeated movements which can be difficult to analyse quantitatively. Here, the authors apply a data-driven framework based on theory of dynamical systems to characterize nematode behaviour and explain its complexity through deterministic chaotic dynamics.

Chaotic worms

Nature Physics - Δευ, 05/10/2020 - 00:00

Nature Physics, Published online: 05 October 2020; doi:10.1038/s41567-020-01058-2

Animals seem capable of an infinite variety of movement, yet also exhibit substantial stereotypy in repeated actions. A beautiful view of worm behaviour now shows that the worm’s state evolves deterministically but is bounced chaotically between unstable periodic orbits.

15 years of <i>Nature Physics</i>

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01051-9

Over the last 15 years, the content of Nature Physics has covered an enormous breadth of subjects at the forefront of physics. The journal’s past and present editors recount their favourite papers and what made chaperoning them to publication special.

Metrology on a grand scale

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01059-1

The assembly of the more than a million single parts of the ITER tokamak requires large-scale three-dimensional precision metrology. John Villanueva Jr gives us insights into the complexity of this project.

Across the city

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01066-2

Across the city

A noisy orchestra

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01064-4

A noisy orchestra

Mind the gap

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01067-1

Mind the gap

Ising model for strings

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01065-3

Ising model for strings

Flattening the band

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01072-4

Flattening the band

Perovskite fever

Nature Physics - Πέμ, 01/10/2020 - 00:00

Nature Physics, Published online: 01 October 2020; doi:10.1038/s41567-020-01060-8

Perovskite fever

Herding an evolving biological population with quantum control tools

Nature Physics - Τετ, 30/09/2020 - 00:00

Nature Physics, Published online: 30 September 2020; doi:10.1038/s41567-020-01050-w

Populations of organisms can be regarded as clouds of genetic variants evolving passively in response to mutation and natural selection. Counterdiabatic driving — a tool borrowed from quantum control — now offers the possibility of actively controlling both the rate and route followed by an evolving population.

Theory of mechanochemical patterning and optimal migration in cell monolayers

Nature Physics - Δευ, 28/09/2020 - 00:00

Nature Physics, Published online: 28 September 2020; doi:10.1038/s41567-020-01037-7

Spatiotemporal waves appear during collective cell migration and are affected by mechanical forces and biochemical signalling. Here the authors develop a biophysical model that can quantitatively account for complex mechanochemical patterns, and predict how they can be used for optimal collective migration.

Inertial spin dynamics in ferromagnets

Nature Physics - Δευ, 28/09/2020 - 00:00

Nature Physics, Published online: 28 September 2020; doi:10.1038/s41567-020-01040-y

Inertial dynamics are observed in a ferromagnet. Specifically, a nutation is seen on top of the usual spin precession that has a lifetime on the order of 10 picoseconds.

Observation of flat bands in twisted bilayer graphene

Nature Physics - Δευ, 28/09/2020 - 00:00

Nature Physics, Published online: 28 September 2020; doi:10.1038/s41567-020-01041-x

Spectroscopic measurements using nano-ARPES on twisted bilayer graphene directly highlight the presence of the flat bands.

A roadmap for the future

Nature Physics - Πέμ, 24/09/2020 - 00:00

Nature Physics, Published online: 24 September 2020; doi:10.1038/s41567-020-01054-6

The particle physics community refreshes the roadmap for the field in Europe, taking into account the worldwide context, in the so-called European Strategy for Particle Physics update, which happens every seven years.

Time–information uncertainty relations in thermodynamics

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-0981-y

A time–information uncertainty relation in thermodynamics has been derived, analogous to the time–energy uncertainty relation in quantum mechanics, imposing limits on the speed of energy and entropy exchange between a system and external reservoirs.

The symmetry of superconducting Sr<sub>2</sub>RuO<sub>4</sub>

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1034-2

Ultrasound experiments reveal a multicomponent superconducting order parameter in Sr2RuO4.

Machine learning the thermodynamic arrow of time

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1018-2

The phrase ‘arrow of time’ refers to the asymmetry in the flow of events. A machine learning algorithm trained to infer its direction identifies entropy production as the relevant underlying physical principle in the decision-making process.

Thermodynamic evidence for a two-component superconducting order parameter in Sr<sub>2</sub>RuO<sub>4</sub>

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1032-4

Ultrasound measurements show that the superconducting order parameter in strontium ruthenate must have two components.

An odd couple

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1020-8

An atomic spin oscillator coupled to a mechanical membrane resonator forms an effective negative-mass oscillator. Entanglement in this hybrid quantum system is created by a backaction-evading position measurement, despite the macroscopic separation.

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