From the 2 of 5 linked papers with an AI index.
5 papers
Anisotropic separate universe : Long-wavelength perturbations and conserved quantities
Daiki Saito, Atsushi Naruko
The paper extends the separate‑universe approach to anisotropic cosmologies, deriving super‑horizon solutions for scalar, vector, and tensor perturbations and identifying conserved…
Evading Cosmological Strong Coupling in Non-minimally Coupled Vector Gravity
Antonio De Felice, Seishi Enomoto, Nagisa Hiroshima +1
Recent analyses of Proca theories with non-minimal curvature couplings have uncovered an additional scalar degree of freedom with an identically vanishing propagation speed, $c_s^2…
Imprints of flat space analyticity in de Sitter S-matrix
Jason Kristiano, Ryo Namba, Atsushi Naruko +2
The analytic structure of the flat-space S-matrix provides non-perturbative constraints on low-energy effective field theories based on the properties of high-energy theory. While…
Primordial black holes from a curvaton: the role of bimodal distributions
Tomotaka Kuroda, Atsushi Naruko, Vincent Vennin +1
We investigate the formation of primordial black holes in curvaton models of inflation, where the curvature perturbation is not only generated by the inflaton but also by a light s…
Evolution of a kink-antikink ensemble in a quantum vacuum
Mainak Mukhopadhyay, Kohta Murase, Atsushi Naruko +1
We study the flat spacetime dynamics of a classical field configuration corresponding to an ensemble of sine-Gordon kinks and antikinks, semi-classically coupled to a quantum…