4,212 research outputs found
The Sakai-Sugimoto soliton
No full textThe Sakai-Sugimoto model is the preeminent example of a string theory description of holographic QCD, in which baryons correspond to topological solitons in the bulk. Here we investigate the validity of various approximations of the Sakai-Sugimoto soliton that are used widely to study the properties of holographic baryons. These approximations include the flat space self-dual instanton, a linear expansion in terms of eigenfunctions in the holographic direction and an asymptotic power series at large radius. These different approaches have produced contradictory results in the literature regarding properties of the baryon, such as relations for the electromagnetic form factors. Here we determine the regions of validity of these various approximations and show how to relate different approximations in contiguous regions of applicability. This analysis clarifies the source of the contradictory results in the literature and resolves some outstanding issues, including the use of the flat space self-dual instanton, the detailed properties of the asymptotic soliton tail, and the role of the UV cutoff introduced in previous investigations. A consequence of our analysis is the discovery of a new large scale, that grows logarithmically with the 't Hooft coupling, at which the soliton fields enter a nonlinear regime. Finally, we provide the first numerical computation of the Sakai-Sugimoto soliton and demonstrate that the numerical results support our analysis. © 2014 The Author(s)
Modes of the Sakai-Sugimoto soliton
No full textThe instanton in the Sakai-Sugimoto model corresponds to the Skyrmion on the holographic boundary - which is asymptotically flat - and is fundamentally different from the flat Minkowski space Yang-Mills instanton. We use the Atiyah-Patodi-Singer index theorem and a series of transformations to show that there are 6k zeromodes - or moduli - in the limit of infinite \u27t Hooft coupling of the Sakai-Sugimoto model. The implications for the low-energy baryons - the Skyrmions - on the holographic boundary, is a scale separation between 2k heavy massive modes and 6k-9 light massive modes for k>1; the 9 global transformations that correspond to translations, rotations and isorotations remain as zeromodes. For k=1 there are 2 heavy modes and 6 zeromodes due to degeneracy between rotations and isorotations.LaTeX: 14 pages, 3 figures; V3: comments added and typos correcte
Lepidoceropsyche manoi Saigusa and Sugimoto 2022, sp. nov.
No full textLepidoceropsyche manoi Saigusa and Sugimoto, sp. nov. (Figs. 1, 2) Diagnosis. There is only one species of Lepidoceropsyche, gen. nov.; the previously mentioned genus-level diagnostic characters distinguish this species from other Psychidae. Rather small-sized, entirely blackish species, with fluffy antennae clothed with long slender scales on flagellum, 2-sgemented labial palpi and moderately narrow wings. Female. (Fig. 1A) Length. Forewing 8.0– 9.2mm (excluding fringe), 8.4–9.5 mm (including fringe). Wing expanse 18–19 mm. Body 6.3–7.0 mm (from head to apex of corethrogyne). Coloration and vestiture. Head, thoracic nota and abdomen covered with blackish brown scales, thoracic pleura with dark brown to brown scales. Head clothed with more or less appressed short scales on face, elongate more or less appressed scales on vertex; occiput with short scales, of which dorsolateral ones covering lateral parts of vertex. Cranium posterior to antennal sockets and narrow areas along posterior margin of compound eyes naked and polished. Labial palpus clothed with elongate scales.Antenna: Scape and pedicel with short scales; flagellomere densely bearing long narrow black scales, that are 2–3 × as long as flagellomere, 1/10 as wide as long and with 2–3 short teeth apically. Prothorax with pair of rough bundles of long, erect scales posterior to head. Mesonotum covered with appressed elongate scales; tegula with long scales projecting its posterior margin; no apical bundle of long scales on mesoscutellum. Legs including epiphysis and spurs densely covered with scales, that are broad on femora and tibiae, more slender on tarsi and spurs; hind tibia dorsally without long fringe hairs. Forewing dorsal surface evenly deep blackish brown, without markings, covered with broad scales; upper scales 2.5 × as long as wide, with truncate distal margin projecting to 4–5 sharp teeth; lower scales smaller than upper ones, nearly 1/2 as long as upper scales, shorter than twice width and with blunt teeth. Fringe irregular in length, fine on basal 1/2, then gradually widening to pointed apex bearing 5–7 sharp teeth. Hindwing dorsal surface blackish brown with anterior marginal area much paler; upper scales twice as long as wide, with truncate distal margin projecting to 3 teeth, middle tooth larger, lateral ones very weak; lower scales smaller than upper ones. Fringe similar that of forewing, with 3–4 apical teeth. Integumentarl morphology. Structure of integumental sclerites is as stated in the description of the genus Lepidoceropsyche. Type material. Holotype. ♀, labelled: Japan. Ryûkyû / Airagawa-rindô / Iriomote-zima / 15.iii.2002 (light)/ K. Sugisima leg.; HOLOTYPE / Lepidoceropsyche manoi /Saigusa & Sugmoto, 2022. (Entomological Laboratory, Kyushu University). Paratypes. Iriomote-jima: 3 ♀, JAPAN: Okinawa / Iriomote Is. / Hunaura / 21-Mar-1995 / T. Mano leg.; PARATYPE / Lepidoceropsyche manoi /Saigusa & Sugmoto, 2022. (Saigusa collection); 1 ♀, [OKINAWA]/ Funaura / Iriomote-jima / 11 April, 2010 LT/ T. Saigusa & M. Sugimoto col.; PARATYPE / Lepidoceropsyche manoi / Saigusa & Sugmoto, 2022. (Saigusa collection) D Ishigaki-jima: 2 ♀, JAPAN: Okinawa / Isigaki Is. / Takeda / 28-Mar- 1993 / T. Mano; PARATYPE / Lepidoceropsyche manoi /Saigusa & Sugmoto, 2022. leg. (Saigusa collection); 2 ♀, 2016.4.9 / Okinawa Pref., Ishigaki-shi / Ooura-damu / T. Komatsu col.; PARATYPE / Lepidoceropsyche manoi /Saigusa & Sugmoto, 2022. (Entomological Laboratory, Kyushu University); 2 ♀, [JPN] Mt. Nosoko, Ishigaki-/Is., Okinawa Pref./ 25.III.2020 LT/ Shunsuke TOMURA leg. / N24,488435, E124,250542; PARATYPE / Lepidoceropsyche manoi / Saigusa & Sugmoto, 2022. (Entomological Laboratory, Kyushu University) G 1 ♀, [JNP] Takeda-rindô / Ishigaki-Is., Okinawa Pref. / 30.III.2020 / Shunsuke TOMURA leg. / N 24,403 622 E 124,183938; PARATYPE / Lepidoceropsyche manoi /Saigusa & Sugmoto, 2022. (Entomological Laboratory, Kyushu University). Type locality. Airagawa, Komi, Taketomi-cho, Iriomote-jima (24̊ 20 ìN, 123̊ 54 ìE), Ryukyus, Japan. Distribution. Iriomote-jima and Ishigaki-jima, Ryukyus, Japan. Etymology. Specific epithet is dedicated to Mr. Takayuki Mano, the first collector of this species, who is the collector of the paratypes of the rare psychid, Kearfottia japonic a Saigusa & Sugimoto, 2021. Remarks. The localities of the type-series of this species are in dense subtropical forests. The type specimens were collected in middle of March to early April. Most of the specimens were attracted to light traps, and their abdomens are shriveled in different degrees by specimens, and hairs of the corethrogyne were considerably consumed. Only a few egg chorions were retained in the abdomen when one of them was dissected. Therefore, the females collected at light traps seem to be attracted to lights after oviposition. On the other hand, one paratype female from Takeda-rindô, Ishigaki-jima that was collected by a sweeping net in daytime (according to Mr. Tomura) has the swollen abdomen with complete, not consumed, corethrogyne. Based on the conditions of the females it is assumed that they emerged at daytime, then copulated, laid eggs and became light in weight until evening, and flew to the light traps. Chorions from the dissected abdomen were oval, very thin and 0.4 mm long, 0.24 mm wide. Immature stages of this species are unknown. We did not find any possible larval or pupal cases referable to this species in the localities. We assume that the larvae of this species probably live on the forest floor and feed on fungi, mold and lichen on rotten logs or base of trees.Published as part of Saigusa, Toyohei & Sugimoto, Mika, 2022, A new primitive genus of the family Psychidae having long-scaled female antennae from the Ryukyus, Japan (Lepidoptera, Tineoidea), pp. 239-245 in Zootaxa 5154 (2) on pages 241-244, DOI: 10.11646/zootaxa.5154.2.8, http://zenodo.org/record/664145
Portraits Of Hiroshi Sugimoto: About Realism And Portraits [portraits De Hiroshi Sugimoto: Sobre Realismo E Retratos]
No full textThis paper aims to discuss the materialization of the presence of british royalty from the sixteenth century in the series of photographs entitled Portraits by Japanese photographer Hiroshi Sugimoto. Photographers own words, paradigms of photographic discourse and characteristics of photography inter-relate to the particularities of Japanese culture. The text departs from traditional photographic discourse that pervades the representation of portraits, drawn mainly from the writings of Roland Barthes. It is precisely representation through portraits that represent one of major paradigms of realistic nature of photography. Realism discourse seems to extrapolate Sugimotos photography to include engravings and paintings based on figurative tradition of the British royalty. The conclusion points out that Sugimotos portraits are structured as an ironic counterpoint to the belief of reproductive realism in the photographic image.81393108Barthes, R., (1984) A câmara clara: nota sobre a fotografia. Rio de Janeiro, , Nova FronteiraBashkokoff, T., (2000) The exactness of the world: a conversation with Hiroshi Sugimoto, , SPECTOR, Nancy. Sugimoto: Portraits. New York: Guggenheim Museum PublicationBelting, H., (2010) Toward an anthropology of the image: anthropologies of art, , www.kunstwissenschaften.hfg-karlsruhe.de, 4 mar 2005Cadava, E., (1997) Words of light, p. 1997. , Theses (Doctorate in photography of history) - United Kingdom: Princeton University TextDubois, P., (1993) O ato fotográfico e outros ensaios, , Campinas: Papirus(2010) GUGGENHEIM COLLECTION, , http://www.guggenheim.org/new-york/collections, Artist: Hiroshi Sugimoto Acesso em: 9 junHockney, D., (2001) O conhecimento secreto, , São Paulo: Cosac & Naif(2012) Atlas base dês ouvres exposées, , http://cartelfr.louvre.fr/cartelfr/visite?srv=car_not_frame&idNotice=26247&langue=frAcessoem:9ago, Hans Holbein dit le Jeune.LOUVREMachado, A., (1984) A ilusão especular: introdução à fotografia, , São Paulo: BrasilienseNaoyuki, K., (2003) The early years of Japanese photography, , TUCKER, Anne (Ed). The history of japanese photography. New Haven and London: Yale University Press(2010) Collect portraits of famous British men and women, , http://www.npg.org.uk/, NATIONAL PORTRAIT GALLERY Acesso em 23 junScreech, T., (1996) The western scientific gaze and popular imagery in later edo Japan the lens within the Heart, , New York Cambridge University PressSugimoto, H., 1999 (2010) Portraits, , www.sugimotohiroshi.com/wax.html, Acesso em 05 de junWisse, J., (2002) The Reformation Heilbrunn Timeline of Art History out, , http://www.metmuseum.org/toah/hd/refo/hd_refo.htm, Acesso em 3 out 2_rffrt WISSE, Jacob.Th
The risk of myocardial stunning is decreased concentration-dependently by KATP channel activation with nicorandil before high K+ cardioplegia.
No full textDrug-induced opening of the adenosine triphosphate-sensitive potassium channel (KATP) during hypoxia and/or ischemia, achieved significant myocardial protection in several in vitro and in vivo models. Pretreatment with KATP openers simulated preconditioning and thus enhanced recovery from ischemia. We have demonstrated that the risk of hypoxia-induced myocardial stunning is reversed by KATP activation with 1 mmol/l nicorandil before cold cardioplegic arrest. Whether lower concentrations were effective is not known.In guinea pig papillary muscle preparations contracting isometrically (driven at 1600 ms cycle), nicorandil was superfused (15 min) either 1 mumol/l (n = 4), 30 mumol/l (n = 4), 100 mumol/l (n = 4), or 1 mmol/l (n = 8) in Tyrode's solution (oxygen content 16 ml/l, 37 degrees C, 5 ml/min). Controls were superfused with saline (Tyrode's solution: n = 8). A group containing vehicle (DMSO 1\%, n = 8) was also studied. In four preparations the KATP channel blocker glibenclamide 1 mumol/l was given before nicorandil 1 mmol/l. Then, long-lasting (120 min) but moderately hypoxic (oxygen content 5 ml/l: 31\% of Tyrode's solution) superfusion with hypothermic (20 degrees C) high K+ (16 mmol/l) cardioplegic solution (5 ml/min) was performed. Recovery of contractility was evaluated after further 60 min of reoxygenation with Tyrode's solution based on DT/TPT (developed tension divided by time to peak tension) as percent of prehypoxia basal values (\%DT/TPT60). DT/TPT was also studied following 15 min of inotropic stimulation with dobutamine 10 mumol/l (\%DT/TPT75). To assess the risk of stunning, we used a multivariate linear model by all possible subsets analysis (BMDP-9R) aimed at predicting both \%DT/TPT60 and \%DT/TPT75 (as continuous dependent variables).During cardioplegia induction, time to arrest (TTA) was (mean +/- S.D.) 103 +/- 48s in control preparations which had poor recovery of contractility (stunning) after reoxygenation (\%DT/TPT60: 71 +/- 20\%; \%DT/TPT75: 443 +/- 272\%). Nicorandil (1 mumol/l-1 mmol/l) abbreviated TTA concentration-dependently (163 +/- 74, 149 +/- 103, 82 +/- 20, and 56 +/- 27s) and improved both \%DT/TPT60 (63 +/- 9, 78 +/- 17, 87 +/- 13, and 98 +/- 11\%) and \%DT/TPT75 (587 +/- 333, 619 +/- 107, 971 +/- 301, and 666 +/- 400\%). Glibenclamide reversed the effects of nicorandil 1 mmol/l (TTA: 165 +/- 30 s, P < 0.01; \%DT/TPT60: 43 +/- 12, P < 0.01; \%DT/TPT75: 272 +/- 147, P < 0.05). Multivariate prediction of myocardial stunning at both 60 and 75 min reoxygenation showed that nicorandil (30 mumol/l-1 mmol/l) was a significant (P < 0.001) protectant whereas glibenclamide was a significant risk factor (P = 0.009). It is unclear whether negative inotropic effects of nicorandil (\%DT/TPT at the end of pretreatment) was mechanistically related to reduced risk of stunning since contribution was seen only to predict \%DT/TPT75 (t = 3.24, P = 0.003) whereas a positive association was observed with \%DT/TPT60 (t = 1.89, P = 0.068).Pretreatment with nicorandil concentration-dependently enhanced the cardioprotective effect of hypothermic high K+ cardioplegia. The risk of myocardial stunning was decreased by KATP opening with nicorandil and increased by KATP block with glibenclamide. Inotropic stimulation with dobutamine might unravel the role of negative inotropic effect of KATP opening as a contributory factor to explain the efficacy of nicorandil in our model
Spin-1 glueballs in the Witten-Sakai-Sugimoto model
No full textWe consider the vector and the pseudovector glueball in the top-down holographic model of large-Nc QCD of Witten and their decays into ordinary mesons described by the D8 brane construction due to Sakai and Sugimoto. At leading order, the relevant interactions are determined exclusively by the Chern-Simons action of the D8 branes and are thus rigidly connected to the chiral anomaly and the Wess-Zumino-Witten terms. As found in a previous study of the pseudovector glueball, which we revisit and complete, the resulting decay widths are surprisingly large, implying that both the pseudovector and the vector glueball are very broad resonances, with a conspicuous dominance of decays into a1ρ and K1(1400)K∗ in the case of the vector glueball. We also obtain a certain weak mixing of vector glueballs with ordinary vector mesons, but we conclude that it does not provide an explanation for the so-called ρπ puzzle in charmonium decays
FIGURE 1 in Japanese species of the genus Proutia Tutt, 1899 (Lepidoptera: Psychidae)
No full textFIGURE 1. Proutia maculatella sp. nov. A: male with well-reticulated forewings; B: male with obscurely maculated forewings; C: slide-mounted male wings; D: male genital right valva; E: male phallus; F: dorsal aspect of male genital dorsum; G: dorsal aspect of male genital anellus; H: upper scale of male forewing upperside; I: lower scale of male forewing upperside; J: upper scales (long ones) and two lower scales of male hindwing upperside; K: male left antenna, macerated.Published as part of Saigusa, Toyohei & Sugimoto, Mika, 2014, Japanese species of the genus Proutia Tutt, 1899 (Lepidoptera: Psychidae), pp. 143-152 in Zootaxa 3869 (2) on page 145, DOI: 10.11646/zootaxa.3869.2.3, http://zenodo.org/record/494719
- …
