Jet evolution from weak to strong coupling

Recent studies, using the AdS/CFT correspondence, of the radiation produced by a decaying system or by an accelerated charge in the N=4 supersymmetric Yang-Mills theory, led to a striking result: the 'supergravity backreaction', which is supposed to describe the energy density at infinitely strong coupling, yields exactly the same result as at zero coupling, that is, it shows no trace of quantum broadening. We argue that this is not a real property of the radiation at strong coupling, but an artifact of the backreaction calculation, which is unable to faithfully capture the space-time distribution of the radiation. This becomes obvious in the case of a decaying system ('virtual photon'), for which the backreaction is tantamount to computing a three-point function in the conformal gauge theory, which is independent of the coupling since protected by symmetries. Whereas this non-renormalization property is specific to the conformal N=4 SYM theory, we argue that the failure of the three-point function to provide a local measurement is in fact generic: it holds in any field theory with non-trivial interactions. To properly study a localized distribution, one should rather compute a four-point function, as standard in deep inelastic scattering. We substantiate these considerations with studies of the radiation produced by the decay of a time-like photon at both weak and strong coupling. We show that by computing four-point functions, in perturbation theory at weak coupling and, respectively, from Witten diagrams at strong coupling, one can follow the quantum evolution and thus demonstrate the broadening of the energy distribution. This broadening is slow when the coupling is weak but it proceeds as fast as possible in the limit of a strong coupling.Comment: 49 pages, 6 figure

Parton picture for the strongly coupled SYM plasma

Deep inelastic scattering off the strongly coupled N=4 supersymmetric Yang-Mills plasma at finite temperature can be computed within the AdS/CFT correspondence, with results which are suggestive of a parton picture for the plasma. Via successive branchings, essentially all partons cascade down to very small values of the longitudinal momentum fraction x and to transverse momenta smaller than the saturation momentum Q_s\sim T/x. This scale Q_s controls the plasma interactions with a hard probe, in particular, the jet energy loss and its transverse momentum broadening.Comment: 4 pages, Talk given at Quark Matter 2008: 20th International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (QM 2008), Jaipur, India, 4-10 Feb 200

Aspects of the UV/IR correspondence : energy broadening and string fluctuations

We show that a source which radiates in the vacuum of the strongly coupled N=4 SYM theory produces an energy distribution which, in the supergravity approximation, has the same space-time pattern as the corresponding classical distribution: the radiation propagates at the speed of light without broadening. We illustrate this on the basis of several examples: a small perturbation propagating down a steady string, a massless particle falling into AdS_5, and the decay of a time-like wave-packet. A similar observation was made in Phys. Rev. D81 (2010) 126001 for the case of a rotating string. In all these cases, the absence of broadening is related to the fact that the energy backreaction on the boundary arises exclusively from the bulk perturbation at, or near, the boundary. This is so since bulk sources which propagate in AdS_5 at the speed of light do not generate any energy on the boundary. We interpret these features as an artifact of the supergravity approximation, which fails to encode quantum mechanical fluctuations that should be present even in the strong coupling limit. We argue that such fluctuations should enter the dual string theory as longitudinal string fluctuations, which are not suppressed at strong coupling. We heuristically estimate the effects of such fluctuations and argue that they restore the broadening of the radiation, in agreement with expectations from both quantum mechanics and the ultraviolet/infrared correspondence.Comment: 47 page

Prinsip Kehati-Hatian Pejabat Pembuat Akta Tanah dalam Peralihan Tanah yang Belum Bersertifikat

Peralihan tanah yang belum bersertifikat rawan menimbulkan sengketa apabila PPAT tidak menerapkan prinsip kehati-hatian. Penelitian ini menganalisis, pertama, apakah Peraturan Jabatan PPAT telah menerapkan prinsip kehati-hatian? Kedua, bagaimana prinsip hehati-hatian PPAT dalam peralihan tanah yang belum bersertifikat. Metode penelitian yang digunakan adalah penelitian hukum normatif. Dari penelitian ini disimpulkan bahwa: pertama, Peraturan Jabatan PPAT telah menerapkan prinsip kehati-hatian. Kedua, prinsip kehati-hatian PPAT dalam peralihan tanah yang belum bersertifikat direfleksikan dalam kewajiban PPAT menolak membuat akta apabila tidak disertai data formil

The Simultaneous Vacancy of the Definitive Regent and Vice Regent Positions in Muara Enim and Ogan Komering Ulu

The condition of a vacancy in the Head of the Region position in a problem that occurred in Muara Enim and Ogan Komering Ulu becomes a unique issue in filling the position because the vacancy happened simultaneously in both the Regent and Vice Regent positions. Currently, in Muara Enim, the position is filled by an Acting Regent (Plt) who was appointed by the Regional People\u27s Representative Council (DPRD) after the Vice Regent\u27s election. However, there is currently a legal challenge in the State Administrative Court (PTUN) regarding the DPRD\u27s appointment decision. For Ogan Komering Ulu Regency, the elected Regent and Vice Regent from the 2020 local elections, Kuryana Azis, passed away shortly after being inaugurated as Regent. Meanwhile, the Vice Regent, who had previously been a corruption defendant, was unable to perform his duties one day after the inauguration. Currently, the Governor has appointed the Head of the Department as the Acting Regent. However, Article 65 paragraphs (5) and (6) of the Local Government Law state that the Secretary of the Region (Sekda) should be the one to carry out the duties as the Acting Regent. "This research aims to provide an answer on the appointment process of the Regent and Vice Regent positions that are vacant simultaneously. This is because the Local Government Law and the Regional Head Election Law only regulate the vacancy of one position, either the Regent or Vice Regent. The method used in this research is a juridical-normative approach, with a combination of legislation analysis, case studies, and comparative approaches. The results of this research show that the appointment of a Substitute Regional Head follows the provisions of Law No. 23 of 2014, Law No. 10 of 2016, and Government Regulation No. 12 of 2018. The position of the Regional Head, Acting Regional Head, Acting Regent, Interim Regent, and Acting Officer is regulated under Law No. 23 of 2014, Law No. 30 of 2014, Law No. 10 of 2016, Government Regulation No. 49 of 2008, and Government Regulation No. 1 of 2018.

Digestion of High Fiber Diet in Sheep and Goat of Jenepponto

Four does (goat, G) and four ewes (sheep, S) of Jeneponto were fed chaffed rice straw hay (3.7%crude protein, 63.5% cell wall constituents, 44.5% acid detergent fiber and 6.2% acid detergent lignin,all based on dry matter). The intakes and digestibility of the diet by G and S were compared. Bothspecies consumed the same level of the diet. G digested dry matter, organic matter, crude protein, crudefiber, and lignin of the diet to a significant higher extent than did by S. The superiority of G over S indigesting the diet was attributable with longer retention time of ruminal fluid and particulate matters inthe rumen and the entire gut, which then resulted in higher proportion of small size particles (<1 mmsieve), higher proportions of propionic, butyric, valeric and isovaleric acid concentrations produced inthe rumen. Additionally for further studies, there were some possibilities of G having a better chewingactivity (duration and intensity), and ability to maintain higher rumen ammonia levels by a greater urearecycle to the rumen, particularly through salivation

The Effect of Ameliorants on Improvement of Soil Fertility in Post Gold Mining Land at West Kalimantan

The application of ameliorant has been suggested to improve soil fertility and crop growth in post illegal gold mining (PIGM) lands. This study evaluated the effect of ameliorant types and semi-permeable layer on properties of soil in PIGM lands and growth of sorghum. A field experiment employed two treatments, i.e. type of ameliorant and semi-permeable layer. There were four ameliorant types applied i.e., without ameliorant (M0); coastal sediment at a dose of 40 t/ha (M1); biochar at a dose of 4 t/ha (M2), and coastal sediment at a dose of 30 t/ha + 4 t biochar/ha(M3). The second treatment consisted of two levels, namely: without a semi-permeable layer (S0) and the semi-permeable layer of 20 cm depth from the soil surface (S1). The results showed that types of ameliorant gave different effect to soil properties. Application of coastal sediment at a dose of 40 t/ha significantly increased the contents of Ca and Mg, whereas application of biochar at a doses of 4 t/ha increased soil CEC. The semi-permeable layer did not significantly affect plant height and stem diameter of sorghum. The highest of sorghum growth was reached by application of coastal sediment at a dose of 30 t/h + biochar at a dose of 4 t/ha. The combination of coastal sediment and biochar from banana peels could complement each other to improve soil fertility in PIGM lan