6 papers
Stationary solutions in the small- expansion of GR
Enes Bal, ErtuÄrul Ekiz, Emre Onur Kahya +1
We study the small- expansion of general relativity in ADM variables up to next-to-next-to-leading order (NNLO). We show that, in the stationary sector, this formulation renders…
Do equation of state parametrizations of dark energy faithfully capture the dynamics of the late universe?
Ãzgür Akarsu, Maria Caruana, Konstantinos F. Dialektopoulos +3
We investigate how strongly late-time inferences about DE dynamics depend on the functional prior used to represent the expansion history. Using identical late-time combinations of…
Hints of sign-changing scalar field energy density and a transient acceleration phase at from model-agnostic reconstructions
Ãzgür Akarsu, Maria Caruana, Konstantinos F. Dialektopoulos +3
We present a data-driven reconstruction of the late-time expansion history and its implications for dark-energy dynamics. Modeling the reduced Hubble rate with a node-based Gaussia…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Quantization of Carrollian fermions
ErtuÄrul Ekiz, Emre Onur Kahya, Utku Zorba
We provide the first example of interacting quantized Carrollian Dirac fermions and investigate their discrete symmetries, including charge conjugation (C), parity (P), and time re…
Holographic Boundary Conformal Field Theory within Horndeski Gravity
Fabiano F. Santos, Behnam Pourhassan, Emmanuel N. Saridakis +3
We investigate entanglement islands and the Page curve in the framework of Horndeski gravity on a Karch-Randall braneworld background. In particular, treating the holographic bound…