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1. Candidate de Sitter vacua

   https://doi.org/10.1103/PhysRevD.111.086015  

   McAllister, Liam; Moritz, Jakob; Nally, Richard; Schachner, Andreas (April 2025, Physical Review D)

   We construct compactifications of type IIB string theory that yield, at leading order in the ${\alpha }^{\prime }$and $g_s$expansions, de Sitter vacua of the form envisioned by Kachru We specify explicit Calabi-Yau orientifolds and quantized fluxes for which we derive the four-dimensional effective supergravity theories, incorporating the exact flux superpotential, the nonperturbative superpotential from Euclidean D3-branes, and the Kähler potential at tree level in the string loop expansion but to all orders in ${\alpha }^{\prime }$. Each example includes a Klebanov-Strassler throat region containing a single anti-D3-brane, whose supersymmetry-breaking energy, computed at leading order in ${\alpha }^{\prime }$, causes an uplift to a metastable de Sitter vacuum in which all moduli are stabilized. Finding vacua that demonstrably survive subleading corrections, and in which the quantization conditions are completely understood, is an important open problem for which this work has prepared the foundations. Published by the American Physical Society2025 

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2. Pattern formation in odd viscoelastic fluids

   https://doi.org/10.1103/PhysRevResearch.6.033100  

   Floyd, Carlos; Dinner, Aaron R; Vaikuntanathan, Suriyanarayanan (July 2024, Physical Review Research)

   Nonreciprocal interactions fueled by local energy consumption can be found in biological and synthetic active matter at scales where viscoelastic forces are important. Such systems can be described by “odd” viscoelasticity, which assumes fewer material symmetries than traditional theories. Here we study odd viscoelasticity analytically and using lattice Boltzmann simulations. We identify a pattern-forming instability which produces an oscillating array of fluid vortices, and we elucidate which features govern the growth rate, wavelength, and saturation of the vortices. Our observation of pattern formation through odd mechanical response can inform models of biological patterning and guide engineering of odd dynamics in soft active matter systems. Published by the American Physical Society2024 

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3. Symmetry constraints and spectral crossing in a Mott insulator with Green's function zeros

   https://doi.org/10.1103/PhysRevResearch.6.L032018  

   Setty, Chandan; Sur, Shouvik; Chen, Lei; Xie, Fang; Hu, Haoyu; Paschen, Silke; Cano, Jennifer; Si, Qimiao (July 2024, Physical Review Research)

   Lattice symmetries are central to the characterization of electronic topology. Recently, it was shown that Green's function eigenvectors form a representation of the space group. This formulation has allowed the identification of gapless topological states even when quasiparticles are absent. Here we demonstrate the profundity of the framework in the extreme case, when interactions lead to a Mott insulator, through a solvable model with long-range interactions. We find that both Mott poles and zeros are subject to the symmetry constraints, and relate the symmetry-enforced spectral crossings to degeneracies of the original noninteracting eigenstates. Our results lead to new understandings of topological quantum materials and highlight the utility of interacting Green's functions toward their symmetry-based design. Published by the American Physical Society2024 

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4. Treelike structure of symmetry topological field theories and multisector QFTs

   https://doi.org/10.1103/PhysRevD.109.106013  

   Baume, Florent; Heckman, Jonathan J; Hübner, Max; Torres, Ethan; Turner, Andrew P; Yu, Xingyang (May 2024, Physical Review D)

   The global symmetries of a $D$-dimensional quantum field theory (QFT) can, in many cases, be captured in terms of a ( $D+1$)-dimensional symmetry topological field theory (SymTFT). In this work we construct a ( $D+1$)-dimensional theory which governs the symmetries of QFTs with multiple sectors which have connected correlators that admit a decoupling limit. The associated symmetry field theory decomposes into a SymTree, namely a treelike structure of SymTFTs fused along possibly nontopological junctions. In string-realized multisector QFTs, these junctions are smoothed out in the extradimensional geometry, as we demonstrate in examples. We further use this perspective to study the fate of higher-form symmetries in the context of holographic large $M$averaging where the topological sectors of different large $M$replicas become dressed by additional extended operators associated with the SymTree. Published by the American Physical Society2024 

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5. Evidence for nonzero electron velocity at the tunnel exit in strong-field atomic ionization

   https://doi.org/10.1103/PhysRevResearch.6.023049  

   Ivanov, I A; Kheifets, A S; Schimmoller, A; Landsman, A S; Kim, Kyung Taec (April 2024, Physical Review Research)

   We provide some evidence for nonzero electron velocity at the tunnel exit in strong-field atomic ionization. Our investigation is based on the analysis of a suitably chosen correlation function which describes correlations between the two observables: the longitudinal electron velocity and the appearance of the photoelectron in the continuum at the end of the laser pulse. The results of the correlation function analysis that we perform are confirmed by the calculations using the quantum orbits method. Published by the American Physical Society2024 

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