200 citations · 2.2k across the 48 of their papers we have counts for
50 papers
Seeing in the Dark: Gravitational Waves from Resonant Production of Dark Photon Dark Matter
Yanou Cui, Pankaj Saha, Evangelos I. Sfakianakis
Ultralight dark photons (DPs) are well-motivated dark matter candidates. A promising yet underexplored mechanism for their relic abundance is parametric resonance in the Abelian-Hi…
Non-Minimally Coupled Chain Inflation at High Scales
Miguel Barroso Varela, Orfeu Bertolami, Katherine Freese +1
Chain inflation offers an alternative to standard slow-roll dynamics, with accelerated expansion proceeding through a sequence of rapid quantum tunneling events between metastable…
Standard Model Effective Field Theory and Oscillons
Z. Drogosz, E. I. Sfakianakis, K. Slawinska +1
We show that the inclusion of a dimension-six operator in the Higgs potential has a dramatic impact on the stability of oscillons in the bosonic sector of the Standard Mode…
Phenomenology of Inflaton-Driven Early QCD Confinement and Solution to Axion Isocurvature Problem
Evangelos I. Sfakianakis, Barmak Shams Es Haghi, Katherine Freese
We study the phenomenology of early QCD confinement during inflation, driven by a direct coupling between the inflaton and Standard Model gluons. This coupling dynamically raises t…
Isocurvature-Free QCD Axion Dark Matter from Inflaton-Driven Early QCD: the Necessity of Inflationary Plateaus
Katherine Freese, Evangelos I. Sfakianakis, Barmak Shams Es Haghi
A direct coupling between the inflaton and Standard Model gluons can dynamically raise the QCD confinement scale during inflation, making the axion temporarily heavy and suppressin…
Gravitational Wave Echoes of the First Order Phase Transition in a Kination-Induced Big Bang
Richard Casey, Katherine Freese, Evangelos I. Sfakianakis
Gravitational waves (GWs) produced during first-order phase transitions (FOPTs) in the early universe provide a powerful probe of nonstandard cosmological histories. We study GW pr…