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@leftsidestory@mstdn.social
2026-08-07 00:29:32

City Clouds ⛅️
城市云朵 ⛅️
📷 Minolta Hi-Matic AF
🎞️ ERA 100 (FF), expired 1993
If you like my work, Support by buying me a coffee or a roll of film from
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Wise

ERA 100 (FF)

English
A black-and-white photograph of a city street with a pedestrian standing on the sidewalk. The street is lined with tall buildings, streetlights, and a few vehicles. The sky is partly cloudy, and the image captures a sense of urban life with people and infrastructure.
中文
一张黑白照片,拍摄的是一条城市街道,人行道上站着一个行人。街道两侧是高楼大厦、路灯和几辆车。天空部分多云,图片展现了城市生活的景象,包括行人和基础设施。
ERA 100 (FF)

English
A black-and-white photograph of a tree-lined path with two individuals riding bicycles away from the camera. The path is flanked by trees and lampposts, with buildings visible in the distance. The sky is partly cloudy, and the scene conveys a peaceful, urban park setting.
中文
一张黑白照片,拍摄的是一条两侧种有树木的小路,两个人骑着自行车远离镜头。小路两旁有树木和路灯,远处可见建筑物。天空部分多云,场景传达出宁静的城市公园氛围。
ERA 100 (FF)

English
A black-and-white photograph showing two empty chairs in the foreground, placed on a paved surface. In the background, there is a street with trees lining both sides, buildings, and a few vehicles. The sky is partly cloudy, and the scene appears to be taken from a slightly elevated perspective.
中文
一张黑白照片,前景是两把空椅子,放置在铺砌的地面上。背景是一条两侧种有树木的街道,还有建筑物和几辆车。天空部分多云,场景看起来是从一个稍高的角度拍摄的。
ERA 100 (FF)

English
A black-and-white photograph of a brick structure with the text "THOUSAND AND ONE NIGHTS" carved at the top. Below the text, there are decorative elements resembling a crescent moon and stars. The structure features ornate pillars and a circular design with geometric patterns. Trees are visible on the right side of the image, and the sky is partially cloudy.
中文
一张黑白照片,拍摄的是一座砖结构建筑,顶部雕刻着“ONE THOUSAND AND ONE NIGHTS”文字。文字下方有新月和星星的装饰图案。建筑物前方有装饰性的柱子和一个带有几何图案的圆形设计。图片右侧可见树木,天空部分多…
@harrysentonbury@social.linux.pizza
2026-08-06 21:08:46

another top pop label stop pic....
#church #carving

i don't half type some crap sometimes. well anyway, its a monkey-cat like face carved in orange sand stone. hood mould thingy from the same church as the other day. i suppose what i was trying to say is that it ain't blurry. sometimes you have to get the snap from a decent angle to get the proper facial features and because they are high up and well out of reach, you have to stand far away. this means you have to have lots of zoom on the camera, so you have to hope there is a gravestone or some…
@arXiv_hepth_bot@mastoxiv.page
2026-08-07 08:21:32

Scalar Hair at the String-Black-Hole Correspondence
Eliseo Pavone
arxiv.org/abs/2608.06016 arxiv.org/pdf/2608.06016 arxiv.org/html/2608.06016
arXiv:2608.06016v1 Announce Type: new
Abstract: We study static, spherically symmetric axion--dilaton solutions of the tree-level four-dimensional string effective action. Using the sigma-model structure of the scalar sector, we show that the full family of static, spherically symmetric and asymptotically flat solutions is obtained as the $SL(2,\mathbb R)$ orbit of the pure-dilaton FJNW solution, and we characterize the associated axion--dilaton charge space. We then analyze the perturbative regime of these solutions by comparing the onset of $\alpha'$ curvature corrections with that of string-loop corrections. Finally, we apply the string--black-hole correspondence criterion to the FJNW family by evaluating the local $\alpha'$ curvature diagnostic at the physical size $R_{\rm typ}$ of a highly excited string state. With the normalization fixed on the Schwarzschild branch, Schwarzschild saturates the nominal $\alpha'$ threshold at the correspondence surface, whereas every scalar-haired FJNW branch lies above it. More generally, independently of the common overall normalization within the matching prescription, every nonzero-hair branch has a larger curvature diagnostic at the correspondence surface than Schwarzschild. Away from the correspondence point, scalar-haired exteriors may remain under $\alpha'$ control at sufficiently weak local self-gravity and may provide perturbatively controlled long-distance fields of highly excited string states whenever the local string coupling also remains weak.
toXiv_bot_toot

@arXiv_mathCV_bot@mastoxiv.page
2026-08-07 07:37:29

Moduli of the Sourceless Framed Beltrami-Vekua Normal Form
Daniel Alay\'on-Solarz
arxiv.org/abs/2608.05459 arxiv.org/pdf/2608.05459 arxiv.org/html/2608.05459
arXiv:2608.05459v1 Announce Type: new
Abstract: We study the moduli of sourceless framed Beltrami-Vekua equations under recombinations of the unknown, scalings, and orientation-preserving changes of variables. On every bounded simply connected domain, such an equation reduces to $w_{\bar z}=B\bar w$ on the unit disk, with residual symmetries given exactly by zero-free holomorphic gauges and M\"obius transformations. When $B$ is zero-free, the equation is completely classified by two data modulo M\"obius: the hyperbolic mass density $\vartheta=\tfrac14(1-|z|^2)^2|B|^2$ and the phase-curvature current $K=\Delta\arg B$, whose hyperbolic density at $C^2$ regularity is $\kappa=\Delta_{\mathrm{hyp}}\arg B$. We determine the exact range of these invariants: every positive H\"older density and every phase current arising as the Laplacian of a H\"older phase occur. For fields with zeros, the classification extends to the phase-integrable sector through the triple $(\vartheta,d\eta,d{\star}\eta)$, where $\eta=\operatorname{Im}(dB/B)$. On the tame sector, $d\eta$ is the atomic charge measure, while $d{\star}\eta$ carries the remaining phase curvature. Thus the pseudo-analytic mass and charge are numerical projections of a larger infinite-dimensional moduli space. Explicit equal-mass, equal-charge, inequivalent equations are exhibited.
toXiv_bot_toot

@markhburton@mstdn.social
2026-10-06 19:04:43

So they are all going full "Greens are antisemitic", which is, of course untrue.
Sadly it's an own goal: a poorly crafted motion has sucked out all the oxygen.
Labour figures rule out working with Greens after ‘Zionism is racism’ vote | Labour | The Guardian

@arXiv_hepth_bot@mastoxiv.page
2026-08-07 08:23:32

Holographic entanglement entropy with conformal boundary conditions
Elena C\'aceres, Hare Krishna, Harita Palani Balaji, Vaishnavi Patil
arxiv.org/abs/2608.06277 arxiv.org/pdf/2608.06277 arxiv.org/html/2608.06277
arXiv:2608.06277v1 Announce Type: new
Abstract: We study holographic entanglement entropy in 3-dimensional AdS gravity with conformal boundary conditions which fix the conformal class of the boundary metric and its extrinsic curvature, $K$, while leaving the Weyl mode dynamical. Extending Lewkowycz-Maldacena-Dong's replica construction, we derive the corresponding holographic entanglement entropy formula. We show that the fluctuating Weyl mode does not contribute additional entropy. The entropy of the full boundary is therefore the Bekenstein-Hawking entropy, and the entropy of a boundary subregion continues to obey the Ryu-Takayanagi prescription, namely, the area of a minimal surface divided by $4G_N$.
We carry out explicit calculations for global AdS, rotating and non-rotating BTZ geometries. For an interval in AdS$_3$ we find that the $K$-dependent holographic entanglement entropy is governed by $c_m=\frac{3 \ell}{2 G_N}.$ For a thermal state at high conformal temperatures we find that, the entropy is governed by $c_{\rm eff}=\frac{3 \ell}{2 G_N} \frac{K \ell- \sqrt{K^2 \ell^2-4}}{2}$, the same effective central charge that governs the Cardy-like density of states, in agreement with previous results in the literature.
Finally, we also compute the entanglement entropy directly from the conjectured dual boundary theory - a holographic CFT coupled with time-like Liouville theory and deformed by a marginal $T \bar{T}$ like operator - and find $S_{EE} =\frac{c_{\rm eff}}{3} \ln\!\left(\frac{2 R \sin\phi_0}{\epsilon}\right) .$ This result for the state with no operator insertions (vacuum state ), provides an independent boundary realization of $c_{\mathrm{eff}}$ while clarifying that this state is not the state dual to global AdS.
toXiv_bot_toot

@djghettoredneck@mastodon.djghettoredneck.com
2026-09-08 03:19:26

I'm watching The Shield 1x01 "Pilot" #TheShield

@arXiv_hepth_bot@mastoxiv.page
2026-08-07 08:19:20

Emergent gravitational action from non-local $T\bar T$-like deformations
Yun-Ze Li, Bo-Rui Li, Yu-Xiao Liu, Song He
arxiv.org/abs/2608.05913 arxiv.org/pdf/2608.05913 arxiv.org/html/2608.05913
arXiv:2608.05913v1 Announce Type: new
Abstract: We study the gravitational effective action induced, at first order in the deformation parameter, by non-local $T\bar T$-like deformations of quantum field theories. Using a heat-kernel formulation, we extract the local geometric terms generated by stress-tensor two-point functions, and apply the construction to free fermions, massive Maxwell theory, and second-order Yang-Mills theory. While the resulting coefficients are generally model dependent, conformal field theories contain a universal sector fixed by the central charge $C_T$. After regularization and renormalization, this sector yields finite, scheme-independent contributions organized into a finite set of curvature invariants. We further analyze trace-trace deformations, for which the relevant contact terms are determined by the Weyl anomaly, and derive the corresponding finite gravitational action for a general class of minimal non-local kernels. These results provide a quantum effective-action realization of induced gravity in which universal conformal data determine calculable contributions to the emergent geometric response.
toXiv_bot_toot

@djghettoredneck@mastodon.djghettoredneck.com
2026-09-08 03:16:25

I'm watching The Shield 1x01 "Pilot" #TheShield

@harrysentonbury@social.linux.pizza
2026-08-07 10:55:16

grotesque corbel bloke got in my shot again for #windowFriday
#Fensterfreitag

leaded church window in background. in foreground a carved gurning head on a corbel bearing an arch at the east end of the north isle in a medieval church. he has my torch beam under his chin. maybe he has a story for #spookySaturday. unfortunately  he looks like he has lost the power of speech.