30,970 research outputs found
Complexity growth rates for AdS black holes in massive gravity and gravity
The "complexity = action" duality states that the quantum complexity is equal
to the action of the stationary AdS black holes within the Wheeler-DeWitt patch
at late time approximation. We compute the action growth rates of the neutral
and charged black holes in massive gravity and the neutral, charged and
Kerr-Newman black holes in gravity to test this conjecture. Besides, we
investigate the effects of the massive graviton terms, higher derivative terms
and the topology of the black hole horizon on the complexity growth rate.Comment: 11 pages, no figur
Topological invariants for holographic semimetals
We study the behavior of fermion spectral functions for the holographic
topological Weyl and nodal line semimetals. We calculate the topological
invariants from the Green functions of both holographic semimetals using the
topological Hamiltonian method, which calculates topological invariants of
strongly interacting systems from an effective Hamiltonian system with the same
topological structure. Nontrivial topological invariants for both systems have
been obtained and the presence of nontrivial topological invariants further
supports the topological nature of the holographic semimetals.Comment: 39 pages, 11 figures, 1 table; v2: match published versio
Topological nodal line semimetals in holography
We show a holographic model of a strongly coupled topological nodal line
semimetal (NLSM) and find that the NLSM phase could go through a quantum phase
transition to a topologically trivial state. The dual fermion spectral function
shows that there are multiple Fermi surfaces each of which is a closed nodal
loop in the NLSM phase. The topological structure in the bulk is induced by the
IR interplay between the dual mass operator and the operator that deforms the
topology of the Fermi surface. We propose a practical framework for building
various strongly coupled topological semimetals in holography, which indicates
that at strong coupling topologically nontrivial semimetal states generally
exist.Comment: 21 pages, 5 figures; v2: match published versio
Anti-Swarming: Structure and Dynamics of Repulsive Chemically Active Particles
Chemically active Brownian particles with surface catalytic reactions may
repel each other due to diffusiophoretic interactions in the reaction and
product concentration fields. The system behavior can be described by a
`chemical' coupling parameter that compares the strength of
diffusiophoretic repulsion to Brownian motion, and by a mapping to the
classical electrostatic One Component Plasma (OCP) system. When confined to a
constant-volume domain, Body-Centered Cubic crystals spontaneously form from
random initial configurations when the repulsion is strong enough to overcome
Brownian motion. Face-Centered Cubic crystals may also be stable. The `melting
point' of the `liquid-to-crystal transition' occurs at for
both BCC and FCC lattices
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