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Gravity from equilibrium thermodynamics of stretched light cones
Ana Alonso-Serrano, Luis J. Garay, Marek Li\v{s}ka, Celia L\'opez Pineros
https://arxiv.org/abs/2509.08566 h…

Gravity from equilibrium thermodynamics of stretched light cones
This work digs into the connection between gravity and thermodynamics of stretched light cones (SLC). They are associated with uniformly accelerating observers, who endow the SLC with a physical notion of temperature via the Unruh effect. We compute the expansion, shear, and vorticity of the SLC to fully study its dynamics and account for the possibility of previously predicted non-equilibrium entropy production. For consistency, we prove the equivalence of the two different geometrical methods…

Resolving BCFT bulk-cone singularities in braneworlds and top-down holography
Dongming He, Christoph F. Uhlemann
https://arxiv.org/abs/2509.08893 https://a…

Resolving BCFT bulk-cone singularities in braneworlds and top-down holography
Two-point functions in BCFTs exhibit characteristic singularities compared to standard CFTs due to reflected light cones. In holographic BCFTs, further singularities, which need not be related to reflected light cones within the BCFT, can arise when the insertion points are connected by bulk null geodesics. The resulting `bulk-cone singularities' are expected to be an artifact of the `t Hooft limit and should be resolved in string theory. In this work we demonstrate the resolution of bulk-cone …

Color-Blind Image Sensors: Towards Digital Twin of Human Retina
Yushan Meng, Bryce Widdicombe, Dechuan Sun, Paul Beckett, Peter van Wijngaarden, Efstratios Skafidas, Ampalavanapillai Nirmalathas, Ranjith Unnithan
https://arxiv.org/abs/2509.08518

Color-Blind Image Sensors: Towards Digital Twin of Human Retina
The human retina contains a complex arrangement of photoreceptors that convert light into visual information. Conventional image sensors mimic the trichromacy of the retina using periodic filter mosaics responsive to three primary colors. However, this is, at best, an approximation, as an actual retina exhibits a quasi-random spatial distribution of light-sensitive rod and cone photoreceptors, where the ratio of rods to cones and their concentrations vary across the retina. Hence, the periodic …

Tilted Dirac cones and their topology in Holographic Materials
Jeong-Won Seo, Taewon Yuk, Sang-Jin Sin
https://arxiv.org/abs/2509.03033 https://arxiv.org/p…

Tilted Dirac cones and their topology in Holographic Materials
We explore strongly correlated materials with tilted Dirac cone by introducing a method to realize this spectral feature within a holographic setup. Following the work by Moradpouri et al., we construct an asymptotically AdS spacetime by uplifting the vielbein of Volovik et al to tilt the flat spacetime light cone. We then couple the resulting metric to holographic fermions and compute their spectral functions, confirming the presence of a tilted Dirac cone in momentum space. We also calculate …

Codimension two spacelike submanifolds into null hypersurfaces of generalized Robertson-Walker spacetimes
Luis J. Alias, Josue Melendez, Matias Navarro, Didier A. Solis
https://arxiv.org/abs/2508.13852

Codimension two spacelike submanifolds into null hypersurfaces of generalized Robertson-Walker spacetimes
We study codimension two spacelike submanifolds contained into a general class of null hypersurfaces in generalized Robertson-Walker spacetimes, refer to as nullcones. In particular we analyze light cones and lightlike cylinders in Lorentz-Minkowski spacetime, as well as null cones in de Sitter spacetime. We give conditions on a radial coordinate that guarantee that such a spacelike submanifold is conformally diffeomorphic to the hyperbolic space, a round cylinder a sphere; respectively. We als…

Semi-classical spacetime thermodynamics
Ana Alonso-Serrano, Marek Li\v{s}ka, Micha{\l} Piotrak
https://arxiv.org/abs/2509.05052 https://arxiv.org/pdf/2509.…

Semi-classical spacetime thermodynamics
We derive the semi-classical gravitational dynamics from thermodynamics of local stretched light cones in 2-dimensional dilaton gravity, explicitly treating the backreaction of quantum matter through the conformal anomaly's effect on the generalized entropy. We also sketch the extension of this analysis to the conformal anomaly in 4-dimensional semi-classical gravity. In direct connection to this problem, we also tackle the appropriate definition of Wald entropy in thermodynamic derivation of e…