101 citations · 728 across the 46 of their papers we have counts for
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Gravitational Production of Massive Spin-2 Particles During Reheating
Sarunas Verner
We study the minimal gravitational portal for a massive spin-2 dark matter candidate produced during perturbative reheating. The dark sector couples to the visible sector…
Gravitational Waves from Isocurvature Perturbations of Spectator Scalar Fields
Marcos A. G. Garcia, Sarunas Verner
We present a mechanism for gravitational wave (GW) production from isocurvature perturbations in spectator scalar fields during inflation. These energetically subdominant fields de…
Constraints on Attractor Models of Inflation and Reheating from Planck, BICEP/Keck, ACT DR6, and SPT-3G Data
John Ellis, Marcos A. G. Garcia, Keith A. Olive +1
We analyze the latest cosmic microwave background (CMB) constraints on the scalar spectral index and tensor-to-scalar ratio from Planck 2018, BICEP/Keck 2018, the Atacama…
Gravitational Waves from Spectator Scalar Fields
Marcos A. G. Garcia, Sarunas Verner
We propose a novel mechanism for gravitational wave (GW) production sourced by spectator scalar fields during inflation. These fields, while not driving cosmic expansion, generate…
The Electroweak Sphaleron Revisited: II. Study of Decay Dynamics
Konstantin T. Matchev, Sarunas Verner
We present a comprehensive analysis of electroweak sphaleron decay dynamics, employing both analytical techniques and high-resolution numerical simulations. Using a spherically sym…
The Electroweak Sphaleron Revisited: I. Static Solutions, Energy Barrier, and Unstable Modes
Konstantin T. Matchev, Sarunas Verner
The electroweak sphaleron is a static, unstable solution of the Standard Model classical field equations, representing the energy barrier between topologically distinct vacua. In t…
Scalar Field Fluctuations and the Production of Dark Matter
Marcos A. G. Garcia, Wenqi Ke, Yann Mambrini +2
One of the simplest possible candidates for dark matter is a stable scalar singlet beyond the Standard Model. If its mass is below the Hubble scale during inflation, long-wavelengt…