28 papers
Who Writes the Gravitational Second Law of Thermodynamics?
V. R. Shajiee, M. M. Sheikh-Jabbari, V. Taghiloo
We define gravitational entropy as the manifestly integrable surface charge associated with local transverse Lorentz boosts, entirely bypassing the conventional reliance on spaceti…
Dynamical Entropy Is a Noether Charge
V. R. Shajiee, M. M. Sheikh-Jabbari, V. Taghiloo
The authors demonstrate that the entropy of a dynamically evolving null surface (such as a black‑hole horizon) can be identified as a Noether charge, and they prove a local-in-time…
Null-strings Gauged, Reloaded and Quantized, I: Canonical Quantization in the Light-Cone Gauge
Ida M. Rasulian, M. M. Sheikh-Jabbari, H. Yavartanoo
We study the light-cone quantization of null-strings in dimensional flat target-space. Incorporating the essential new gauge symmetry and the associated constraint structure of…
Geometric Aspects of Covariant Phase Space Formalism: Solution Space Slicings and Surface Charge Integrability
M. Golshani, M. M. Sheikh-Jabbari, V. Taghiloo +1
The Covariant Phase Space Formalism (CPSF) provides a robust framework for deriving symplectic structures and surface charges in diffeomorphism-invariant theories. By construction,…
Null Strings Gauged and Reloaded, II: Consistent Classical Treatment of the Null Strings
M. M. Sheikh-Jabbari, H. Yavartanoo
We observed that the null strings, tensionless strings with Carrollian worldsheets, exhibit an extra gauge symmetry, \textit{Carroll-Weyl} gauge symmetry, which cannot be obtained…
Crosschecking Cosmic Distances from DESI BAO and DES SNe
Mauricio Lopez-Hernandez, Eoin à Colgáin, Saeed Pourojaghi +1
We perform a consistency check of DESI DR2 BAO constraints ( by reconstructing the same quantities from DES supernovae (SNe) in bins with the same effective reds…