| 1. |
- Dima, B., et al.
(författare)
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Fungal Systematics and Evolution: FUSE 7
- 2021
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Ingår i: Sydowia. - 0082-0598. ; 73, s. 271-340
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Tidskriftsartikel (refereegranskat)abstract
- In this 7th contribution to the Fungal Systematics and Evolution series published by Sydowia, the authors formally describe 14 species: Cantharomyces paschalis, Cryptandromyces pinguis, C. tricornis, Laboulbenia amblystomi (Laboulbeniales); Cortinarius squamosus, Entoloma brunneicoeruleum, E. callipygmaeum, E. minutigranulosum, E. perasprellum, E. pulchripes, E. tigrinum, E. timidum, E. violaceoserrulatum (Agaricales); and Suillus quercinus (Boletales). The following new country records are reported: Crepidotus malachioides from Italy, Leucoagaricus mucrocystis from French Guiana, Pluteus multiformis from Turkey (Agaricales); Herpomyces periplanetae from Benin, the D.R. Congo, and Togo (Herpomycetales); Melanustilospora ari from Pakistan (Urocystidales); Neopestalotiopsis clavispora causing fruit rot on Zizyphus mauritiana from India (Amphisphaeriales); and Phytopythium chamaehyphon and Pp. litorale from Brazil (Peronosporales). Finally, a new combination is proposed based on morphology, ecology, and phylogenetic analysis: Rhodocollybia asema (Agaricales).
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| 2. |
- Gorantis, Anastasios, et al.
(författare)
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Analytic continuation of dimensions in supersymmetric localization
- 2018
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Ingår i: Journal of High Energy Physics (JHEP). - : SPRINGER. - 1126-6708 .- 1029-8479. ; :2
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Tidskriftsartikel (refereegranskat)abstract
- We compute the perturbative partition functions for gauge theories with eight supersymmetries on spheres of dimension d <= 5, proving a conjecture by the second author. We apply similar methods to gauge theories with four supersymmetries on spheres with d <= 3. The results are valid for non-integer d as well. We further propose an analytic continuation from d = 3 to d = 4 that gives the perturbative partition function for an N = 1 gauge theory. The results are consistent with the free multiplets and the one-loop beta-functions for general N = 1 gauge theories. We also consider the analytic continuation of an N = 1 preserving mass deformation of the maximally supersymmetric gauge theory and compare to recent holographic results for N = 1* super Yang-Mills. We find that the general structure for the real part of the free energy coming from the analytic continuation is consistent with the holographic results.
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| 3. |
- Minahan, Joseph A., et al.
(författare)
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Conformal field theories on deformed spheres, anomalies, and supersymmetry
- 2021
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Ingår i: SciPost Physics. - : Stichting SciPost. - 2542-4653. ; 10:3
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Tidskriftsartikel (refereegranskat)abstract
- We study the free energy of four-dimensional CFTs on deformed spheres. For generic nonsupersymmetric CFTs only the coefficient of the logarithmic divergence in the free energy is physical, which is an extremum for the round sphere. We then specialize to N = 2 SCFTs where one can preserve some supersymmetry on a compact manifold by turning on appropriate background fields. For deformations of the round sphere the c anomaly receives corrections proportional to the supersymmetric completion of the (Weyl)(2) term, which we determine up to one constant by analyzing the scale dependence of various correlators in the stress-tensor multiplet. We further show that the double derivative of the free energy with respect to the marginal couplings is proportional to the two-point function of the bottom components of the marginal chiral multiplet placed at the two poles of the deformed sphere. We then use anomaly considerations and counter-terms to parametrize the finite part of the free energy which makes manifest its dependence on the Kahler potential. We demonstrate these results for a theory with a vector multiplet and a massless adjoint hypermultiplet using results from localization. Finally, by choosing a special value of the hypermultiplet mass where the free energy is independent of the deformation, we derive an infinite number of constraints between various integrated correlators in N = 4 super Yang-Mills with any gauge group and at all values of the coupling, extending previous results.
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| 4. |
- Minahan, Joseph A., et al.
(författare)
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Gauge theories on spheres with 16 supercharges and non-constant couplings
- 2019
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Ingår i: Journal of Physics A. - : IOP Publishing. - 1751-8113 .- 1751-8121. ; 52:23
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Tidskriftsartikel (refereegranskat)abstract
- We construct a class of theories with 16 supersymmetries on spheres of dimension nine and less. The gauge coupling and mass terms for the scalar fields depend on the polar angle away from the north pole. Assuming finite coupling on the north pole, this leads to zero coupling at the south pole for d>4 and infinite coupling at the south pole for d<4. The underlying supersymmetry algebra of these theories is shown to be isomorphic to the Poincaré superalgebra in d-dimensions. We also give a localization procedure which leads to nontrivial results for d=2.
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| 5. |
- Minahan, Joseph A., et al.
(författare)
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One-loop tests of supersymmetric gauge theories on spheres
- 2017
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Ingår i: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :7
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Tidskriftsartikel (refereegranskat)abstract
- We show that a recently conjectured form for perturbative supersymmetric partition functions on spheres of general dimension d is consistent with the flat space limit of 6-dimensional N = 1 super Yang-Mills. We also show that the partition functions for N = 1 8- and 9-dimensional theories are consistent with their known flat space limits.
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| 6. |
- Minahan, Joseph A., et al.
(författare)
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Seven-dimensional super Yang-Mills at negative coupling
- 2023
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Ingår i: SciPost Physics. - : SCIPOST FOUNDATION. - 2542-4653. ; 14:3
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Tidskriftsartikel (refereegranskat)abstract
- We consider the partition function for Euclidean SU(N) super Yang-Mills on a squashed seven-sphere. We show that the localization locus of the partition function has instanton membrane solutions wrapping the six "fixed" three-spheres on the S7. The ADHM vari-ables of these instantons are fields living on the membrane world volume. We compute their contribution by localizing the resulting three-dimensional supersymmetric field theory. In the round-sphere limit the individual instanton contributions are singular, but the singularities cancel when adding the contributions of all six three-spheres. The full partition function on the S7 is well-defined even when the square of the effective Yang -Mills coupling is negative. We show for an SU(2) gauge theory in this regime that the bare negative tension of the instanton membranes is canceled off by contributions from the instanton partition function, indicating the existence of tensionless membranes. We provide evidence that this phase is distinct from the usual weakly coupled super Yang -Mills and, in fact, is gravitational.
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| 7. |
- Minahan, Joseph A., et al.
(författare)
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Squashing and supersymmetry enhancement in three dimensions
- 2022
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Ingår i: SciPost Physics. - : Stichting SciPost. - 2542-4653. ; 12:1
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Tidskriftsartikel (refereegranskat)abstract
- We consider mass-deformed theories with N >= 2 supersymmetry on round and squashed three-spheres. By embedding the supersymmetric backgrounds in extended supergravity we show that at special values of mass deformations the supersymmetry is enhanced on the squashed spheres. When the 3d partition function can be obtained by a limit of a 4d index we also show that for these special mass deformations only the states annihilated by extra supercharges contribute to the index. By using an equivalence between partition functions on squashed spheres and ellipsoids, we explain the recently observed squashing independence of the partition function of mass-deformed ABJ(M) theory on the ellipsoid. We provide further examples of such simplification for various 3d supersymmetric theories.
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| 8. |
- Naseer, Usman
(författare)
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(1,0) gauge theories on the six-sphere
- 2019
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Ingår i: SciPost Physics. - : SciPost Foundation. - 2542-4653. ; 6:1
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Tidskriftsartikel (refereegranskat)abstract
- We construct gauge theories with a vector-multiplet and hypermultiplets of (1,0) supersymmetry on the six-sphere. The gauge coupling on the sphere depends on the polar angle. This has a natural explanation in terms of the tensor branch of (1,0) theories on the six-sphere. For the vector-multiplet we give an off-shell formulation for all supersymmetries. For hypermultiplets we give an off-shell formulation for one supersymmetry. We show that the path integral for the vector-multiplet localizes to solutions of the Hermitian-Yang-Mills equation, which is a generalization of the (anti-)self duality condition to higher dimensions. For the hypermultiplet, the path integral localizes to configurations where the field strengths of two complex scalars are related by an almost complex structure.
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| 9. |
- Naseer, Usman, et al.
(författare)
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Extremal isosystolic metrics with multiple bands of crossing geodesics
- 2022
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Ingår i: Advances in Theoretical and Mathematical Physics. - : INT PRESS BOSTON, INC. - 1095-0761 .- 1095-0753. ; 26:5, s. 1273-1346
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Tidskriftsartikel (refereegranskat)abstract
- We apply recently developed convex programs to find the minimal-area Riemannian metric on 2n-sided polygons (n = 3) with length conditions on curves joining opposite sides. We argue that the Riemannian extremal metric coincides with the conformal extremal metric on the regular 2n-gon. The hexagon was considered by Calabi. The region covered by the maximal number n of geodesics bands extends over most of the surface and exhibits positive curvature. As n ? 8 the metric, away from the boundary, approaches the well-known round extremal metric on RP2. We extend Calabi's isosystolic variational principle to the case of regions with more than three bands of systolic geodesics. The extremal metric on RP2 is a stationary point of this functional applied to a surface with infinite number of systolic bands.
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| 10. |
- Naseer, Usman, et al.
(författare)
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Flavor deformations and supersymmetry enhancement in 4d N = 2 theories
- 2022
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Ingår i: SciPost Physics. - : SCIPOST FOUNDATION. - 2542-4653. ; 13:3
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Tidskriftsartikel (refereegranskat)abstract
- We study N = 2 theories on four-dimensional manifolds that admit a Killing vector v with isolated fixed points. It is possible to deform these theories by coupling position-dependent background fields to the flavor current multiplet. The partition function of the deformed theory only depends on the value of the background scalar fields at the fixed points of v. For a single adjoint hypermultiplet, the partition function becomes independent of the supergravity as well as the flavor background if the scalars attain special values at the fixed points. For these special values, supersymmetry at the fixed points enhances from the Donaldson-Witten twist to the Marcus twist or the Vafa-Witten twist of N = 4 SYM. Our results explain the recently observed squashing independence of N = 2* theory on the squashed sphere and provide a new squashing independent point. Interpreted through the AGT-correspondence, this implies the b-independence of torus one-point functions of certain local operators in Liouville/Toda CFT. The position-dependent deformations imply relations between correlators of partially integrated operators in any N = 2 SCFT with flavor symmetries.
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