87 citations · 372 across the 31 of their papers we have counts for
31 papers
Topological delocalisation of confined 3D active nematics
Louise C. Head, Pasquale Digregorio, Davide Marenduzzo +3
Defect lines in 3D active nematic systems are intriguing topological singularities whose out-of-equilibrium dynamics remain elusive in confined settings. Here, we numerically study…
Flow of deformable droplets: self-pinned glasses and string-like flow
Achille Quarante, Michael Chiang, Davide Marenduzzo +1
We investigate, through numerical simulations, the rheology of a dry suspension of deformable droplets under pressure-driven flow. The system exhibits two force-driven dynamical tr…
Geometry and relaxation dynamics of nematic loops
F. Aprile, A. J. H. Houston, G. Gonnella +3
Disclination lines in three-dimensional nematic liquid crystals generically form closed loops whose topology is classified by homotopy theory. While this classification successfull…
Topological localisation and motility of active knots
Andrea Bonato, Davide Marenduzzo, Enzo Orlandini +1
Nonequilibrium active polymers provide a minimal framework to investigate biopolymers such as DNA and chromatin under the action of molecular motors. Here we study active ring poly…
Spontaneous phase separation and pattern formation in a lyotropic nematic mixture
A. Bensabat, O. Skelton, J. Arlt +5
Lyotropic liquid crystals can display rich phase behaviour and self-organisation, yet the physical principles underlying their self-assembly into large scale patterns remains under…
Arrested phase separation and chiral symmetry breaking in active dumbbells under shear
Lucio Mauro Carenza, Giuseppe Negro, Pasquale Digregorio +2
Through molecular dynamics simulations, we investigate the phase separation and aggregation dynamics of active dumbbell particles in two-dimensions subjected to shear. We find that…
Transverse Self-Propulsion Enhances the Aggregation of Active Dumbbells
Pasquale Digregorio, Daniela Moretti, Claudio Basilio Caporusso +5
We investigate a two-dimensional system of active Brownian dumbbells using molecular dynamics simulations. In this model, each dumbbell is driven by an active force oriented perpen…
Modelling transcriptional silencing and its coupling to 3D genome organisation
Massimiliano Semeraro, Giuseppe Negro, Davide Marenduzzo +1
Timely up- or down-regulation of gene expression is crucial for cellular differentiation and function. While gene upregulation via transcriptional activators has been extensively i…
Activity drives self-assembly of passive soft inclusions in active nematics
Ahmet Umut Akduman, Yusuf Sariyar, Giuseppe Negro +1
Active nematics are out-of-equilibrium systems in which energy injection at the microscale drives emergent collective behaviors, from spontaneous flows to active turbulence. While…
Thick liquid crystalline cholesteric shells
Arda Bulut, Yusuf Sariyar, Giuseppe Negro +1
We numerically investigate the phase behavior of thick shells of cholesteric liquid crystals with tangential anchoring at the shell boundary. For achiral liquid crystal, we demonst…
Fluctuation Theorems for Heat exchanges between passive and active baths
Massimiliano Semeraro, Antonio Suma, Giuseppe Negro
In addition to providing general constraints on probability distributions, fluctuation theorems allow to infer essential information on the role played by temperature in heat excha…
Entropy production of active Brownian particles going from liquid to hexatic and solid phases
Massimiliano Semeraro, Giuseppe Negro, Antonio Suma +2
Due to its inherent intertwinement with irreversibility, entropy production is a prime observable to monitor in systems of active particles. In this numerical study, entropy produc…
3D active nematic disclinations behave as Majorana quasiparticles
Louise C. Head, Giuseppe Negro, Livio N. Carenza +7
Quasiparticles are low-energy excitations with important roles in condensed matter physics. An intriguing example is provided by Majorana fermions, quasiparticles which are identic…
Controlling flow patterns and topology in active emulsions
Giuseppe Negro, Louise C. Head, Livio N. Carenza +4
Active emulsions and liquid crystalline shells are intriguing and experimentally realisable types of topological matter. Here we numerically study the morphology and spatiotemporal…
A unified-field theory of genome organization and gene regulation
Giuseppe Negro, Massimiliano Semeraro, Perter R Cook +1
Our aim is to predict how often genic and non-genic promoters fire within a cell. We first review a parsimonious pan-genomic model for genome organization and gene regulation, wher…
Spontaneous Self-Constraint in Active Nematic Flows
Louise C. Head, Claire Dore, Ryan Keogh +5
Active processes drive and guide biological dynamics across scales -- from subcellular cytoskeletal remodelling, through tissue development in embryogenesis, to population-level ba…
Growth regimes in three-dimensional phase separation of liquid-vapor systems
Giuseppe Negro, Giuseppe Gonnella, Antonio Lamura +2
The liquid-vapor phase separation is investigated via lattice Boltzmann simulations in three dimensions. After expressing length and time scales in reduced physical units, we combi…
Cluster size determines internal structure of transcription factories in human cells
Massimiliano Semeraro, Giuseppe Negro, Giada Forte +4
Transcription is a fundamental cellular process, and the first step of gene expression. In human cells, it depends on the binding to chromatin of various proteins, including RNA po…
3D polymer simulations of genome organization and transcription across different chromosomes and cell types
Massimiliano Semeraro, Giuseppe Negro, Antonio Suma +2
We employ the diffusing transcription factors model for numerical simulation of chromatin topology conformations and transcriptional processes of human chromatin. Simulations of a…
Topological Phases and Curvature-Driven Pattern Formation in Cholesteric Shells
Giuseppe Negro, Livio Nicola Carenza, Giuseppe Gonnella +2
We study the phase behaviour of cholesteric liquid crystal shells with different geometries. We compare the cases of tangential and no anchoring at the surface, focussing on the fo…
Yield-stress transition in suspensions of deformable droplets
Giuseppe Negro, Livio Nicola Carenza, Giuseppe Gonnella +3
Yield-stress materials, which require a sufficiently large forcing to flow, are currently ill-understood theoretically. To gain insight into their yielding transition, here we stud…
Cholesteric shells: two-dimensional blue fog and finite quasicrystals
Livio Nicola Carenza, Giuseppe Gonnella, Davide Marenduzzo +2
We study the phase behaviour of a quasi-two dimensional cholesteric liquid crystal shell. We characterise the topological phases arising close to the isotropic-cholesteric transiti…
Rheology of active emulsions with negative effective viscosity
Ilario Favuzzi, Livio Nicola Carenza, Federico Corberi +3
We numerically study by lattice Boltzmann simulations the rheological properties of an active emulsion made of a suspension of an active polar gel embedded in an isotropic passive…
Activity induced isotropic-polar transition in active liquid crystals
M. G. Giordano, F. Bonelli, L. N. Carenza +2
Active fluids are intrinsically out-of-equilibrium systems due to the internal energy injection of the active constituents. We show here that a transition from a motion-less isotro…