5 papers
How Dilatation Invariance Suppresses Loop Corrections to Curvature Perturbations on CMB Scales
Danilo Artigas, Shi Pi, Takahiro Tanaka +1
Departures from standard slow-roll (SR) inflation have attracted increasing interest in recent years. In particular, scenarios that strongly enhance the power spectrum of the curva…
Locality in effective field theory for inflationary soft modes
Takahiro Tanaka, Yuko Urakawa
The gradient expansion and the separate universe approach provide an effective description of inflationary soft modes after coarse-graining shorter-wavelength degrees of freedom. W…
Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the formalism
Pankaj Saha, Yuichiro Tada, Yuko Urakawa
Understanding when inflationary perturbations become genuinely nonlinear near the horizon crossing requires methods that go beyond both linear perturbation theory and the gradient…
Constraining Axion-like Particles through Multi-epoch Monitoring of Strong Gravitational Lenses
Shivani Deshmukh, Aritra Basu, Dominik J. Schwarz +2
We present new constraints on ultralight axion-like particles (ALPs) through multi-epoch measurements of differential birefringence induced due to a coupling () between th…
Potential Surge Preheating: enhanced resonance from potential features
Pankaj Saha, Yuko Urakawa
We investigate the effects of local features in the inflationary potential on the preheating dynamics after inflation. We show that a small feature in the potential can enhance the…