Jay Armas
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View article: On the temperature of an active nematic
On the temperature of an active nematic Open
We employ a novel hydrodynamic framework for active matter coupled to an environment to study the local temperature of an active nematic, assuming proximity to thermal equilibrium. We show that, due to the mechanosensitivity of fuel consum…
View article: Chiral anomaly from (anomalous) spin hydrodynamics
Chiral anomaly from (anomalous) spin hydrodynamics Open
We show that the low energy fluctuations of spinning black Dp branes are described by a theory of spin hydrodynamics on a spacetime $\mathbb{M}_{p+1}\times \mathbb{T}^{n+2}$ in which the fluid is flowing on $\mathbb{M}_{p+1}$ and spinning …
View article: Risk aversion can promote cooperation
Risk aversion can promote cooperation Open
Cooperative dynamics are central to our understanding of many phenomena in living and complex systems. However, we lack a universal mechanism to explain the emergence of cooperation. We present a novel framework for modelling social dilemm…
View article: Resistive relativistic magnetohydrodynamics without Amperes Law
Resistive relativistic magnetohydrodynamics without Amperes Law Open
Resistive magnetohydrodynamics is thought to play a key role in transient astrophysical phenomena such as black hole flares and neutron star magnetospheres. When performing numerical simulations of resistive magnetohydrodynamics, one is fa…
View article: New asymptotically (anti)-de Sitter black holes in (super)gravity
New asymptotically (anti)-de Sitter black holes in (super)gravity Open
A bstract We use the duality between gravitational dynamics and fluids living on dynamical surfaces carrying multiple charges, known as the blackfold approach, to perturbatively construct new asymptotically global (Anti)-de Sitter multi-sp…
View article: New asymptotically (Anti)-de Sitter black holes in (super)gravity
New asymptotically (Anti)-de Sitter black holes in (super)gravity Open
We use the duality between gravitational dynamics and fluids living on dynamical surfaces carrying multiple charges, known as the blackfold approach, to perturbativaly construct new asymptotically global (Anti)-de Sitter multi-spinning, no…
View article: Hydrodynamics of thermal active matter
Hydrodynamics of thermal active matter Open
Active matter concerns many-body systems comprised of living or self-driven agents that collectively exhibit macroscopic phenomena distinct from conventional passive matter. Using Schwinger-Keldysh effective field theory, we develop a nove…
View article: Carrollian Fluids and Spontaneous Breaking of Boost Symmetry
Carrollian Fluids and Spontaneous Breaking of Boost Symmetry Open
In the hydrodynamic regime, field theories typically have their boost symmetry spontaneously broken due to the presence of a thermal rest frame although the associated Goldstone field does not acquire independent dynamics. We show that thi…
View article: Probe particles in odd active viscoelastic fluids: How activity and dissipation determine linear stability
Probe particles in odd active viscoelastic fluids: How activity and dissipation determine linear stability Open
Odd viscoelastic materials are constrained by fewer symmetries than their even counterparts. The breaking of these symmetries allows these materials to exhibit different features, which have attracted considerable attention in recent years…
View article: Approximate higher-form symmetries, topological defects, and dynamical phase transitions
Approximate higher-form symmetries, topological defects, and dynamical phase transitions Open
Higher-form symmetries are a valuable tool for classifying topological phases of matter. However, emergent higher-form symmetries in interacting many-body systems are typically not exact due to the presence of topological defects. In this …
View article: Topological plasma oscillations in the solar tachocline
Topological plasma oscillations in the solar tachocline Open
We study the properties of plasma oscillations in the solar tachocline using shallow-water magnetohydrodynamic equations. These oscillations are expected to correlate with solar activity. We find new qualitative features in the equatorial …
View article: Report on scipost_202401_00003v1
Report on scipost_202401_00003v1 Open
We investigate the thermodynamics of equilibrium thermal states and their near-equilibrium dynamics in systems with fractonic symmetries in arbitrary curved space.By explicitly gauging the fracton algebra we obtain the geometry and gauge f…
View article: Probe particles in odd active viscoelastic fluids: how activity and dissipation determine linear stability
Probe particles in odd active viscoelastic fluids: how activity and dissipation determine linear stability Open
Odd viscoelastic materials are constrained by fewer symmetries than their even counterparts. The breaking of these symmetries allow these materials to exhibit different features, which have attracted considerable attention in recent years.…
View article: Approximate symmetries, pseudo-Goldstones, and the second law of thermodynamics
Approximate symmetries, pseudo-Goldstones, and the second law of thermodynamics Open
We propose a general hydrodynamic framework for systems with spontaneously broken approximate symmetries. The second law of thermodynamics naturally results in relaxation in the hydrodynamic equations and enables us to derive a universal r…
View article: Carrollian fluids and spontaneous breaking of boost symmetry
Carrollian fluids and spontaneous breaking of boost symmetry Open
In the hydrodynamic regime, field theories typically have their boost symmetry spontaneously broken due to the presence of a thermal rest frame although the associated Goldstone field does not acquire independent dynamics. We show that thi…
View article: Lift force in odd compressible fluids
Lift force in odd compressible fluids Open
When a body moves through a fluid, it can experience a force orthogonal to its movement called lift force. Odd viscous fluids break parity and time-reversal symmetry, suggesting the existence of an odd lift force on tracer particles, even …
View article: Report on 2304.09596v1
Report on 2304.09596v1 Open
We investigate the thermodynamics of equilibrium thermal states and their near-equilibrium dynamics in systems with fractonic symmetries in arbitrary curved space.By explicitly gauging the fracton algebra we obtain the geometry and gauge f…
View article: Report on 2304.09596v1
Report on 2304.09596v1 Open
We investigate the thermodynamics of equilibrium thermal states and their near-equilibrium dynamics in systems with fractonic symmetries in arbitrary curved space.By explicitly gauging the fracton algebra we obtain the geometry and gauge f…
View article: Ideal fracton superfluids
Ideal fracton superfluids Open
We investigate the thermodynamics of equilibrium thermal states and their near-equilibrium dynamics in systems with fractonic symmetries in arbitrary curved space. By explicitly gauging the fracton algebra we obtain the geometry and gauge …
View article: Holographic duals of the $$ \mathcal{N} $$ = 1* gauge theory
Holographic duals of the $$ \mathcal{N} $$ = 1* gauge theory Open
A bstract We use the long-wavelength effective theory of black branes (blackfold approach) to perturbatively construct holographic duals of the vacua of the $$ \mathcal{N} $$ = 1* supersymmetric gauge theory. Employing the mechanism of P…
View article: Hydrodynamics of plastic deformations in electronic crystals
Hydrodynamics of plastic deformations in electronic crystals Open
We construct a hydrodynamic framework describing plastic deformations in electronic crystals. The framework accounts for pinning, phase, and momentum relaxation effects due to translational disorder, diffusion due to the presence of inters…
View article: Approximate higher-form symmetries, topological defects, and dynamical phase transitions
Approximate higher-form symmetries, topological defects, and dynamical phase transitions Open
Higher-form symmetries are a valuable tool for classifying topological phases of matter. However, emergent higher-form symmetries in interacting many-body quantum systems are not typically exact due to the presence of topological defects. …
View article: Holographic duals of the $\mathcal{N}=1$* gauge theory
Holographic duals of the $\mathcal{N}=1$* gauge theory Open
We use the long-wavelength effective theory of black branes (blackfold approach) to perturbatively construct holographic duals of the vacua of the $\mathcal{N}=1$* supersymmetric gauge theory. Employing the mechanism of Polchinski and Stra…
View article: Hydrodynamics of plastic deformations in electronic crystals
Hydrodynamics of plastic deformations in electronic crystals Open
We construct a new hydrodynamic framework describing plastic deformations in electronic crystals. The framework accounts for pinning, phase, and momentum relaxation effects due to translational disorder, diffusion due to the presence of in…
View article: Passive odd viscoelasticity
Passive odd viscoelasticity Open
Active chiral viscoelastic materials exhibit elastic responses perpendicular to the applied stresses, referred to as odd elasticity. We use a covariant formulation of viscoelasticity combined with an entropy production analysis to show tha…
View article: Lift force in odd compressible fluids
Lift force in odd compressible fluids Open
We compute the response matrix for a tracer particle in a compressible fluid with odd viscosity living on a two-dimensional surface. Unlike the incompressible case, we find that an odd compressible fluid can produce an odd lift force on a …
View article: A stable and causal model of magnetohydrodynamics
A stable and causal model of magnetohydrodynamics Open
We formulate the theory of first-order dissipative magnetohydrodynamics in an arbitrary hydrodynamic frame under the assumption of parity-invariance and discrete charge symmetry. We study the mode spectrum of Alfvén and magnetosonic waves …
View article: Approximate symmetries, pseudo-Goldstones, and the second law of thermodynamics
Approximate symmetries, pseudo-Goldstones, and the second law of thermodynamics Open
We propose a general hydrodynamic framework for systems with spontaneously broken approximate symmetries. The second law of thermodynamics naturally results in relaxation in the hydrodynamic equations, and enables us to derive a universal …
View article: Effective field theory for hydrodynamics without boosts
Effective field theory for hydrodynamics without boosts Open
We formulate the Schwinger-Keldysh effective field theory of hydrodynamics without boost symmetry. This includes a spacetime covariant formulation of classical hydrodynamics without boosts with an additional conserved particle/charge curre…