8 papers · 1 filter
Signatures of Primordial Energy Injection from Axion Strings
Joshua N. Benabou, Malte Buschmann, Soubhik Kumar +2
Axion strings are horizon-size topological defects that may be produced in the early Universe. Ultra-light axion-like particles may form strings that persist to temperatures below…
Bounds on Gauge Bosons Coupled to Non-conserved Currents
Majid Ekhterachian, Anson Hook, Soubhik Kumar +1
We discuss new bounds on vectors coupled to currents whose non-conservation is due to mass terms, such as . Due to the emission of many final state longitudinally…
TwInflation
Kaustubh Deshpande, Soubhik Kumar, Raman Sundrum
The general structure of Hybrid Inflation remains a very well-motivated mechanism for lower-scale cosmic inflation in the face of improving constraints on the tensor-to-scalar rati…
Heavy Axion Opportunities at the DUNE Near Detector
Kevin J. Kelly, Soubhik Kumar, Zhen Liu
While the QCD axion is often considered to be necessarily light ( eV), recent work has opened a viable and interesting parameter space for heavy axions, which solve both…
The Scalar Chemical Potential in Cosmological Collider Physics
Arushi Bodas, Soubhik Kumar, Raman Sundrum
Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for…
Cosmological Phase Transition of Spontaneous Confinement
Kaustubh Agashe, Peizhi Du, Majid Ekhterachian +2
The dynamics of a cosmological (de)confinement phase transition is studied in nearly conformally invariant field theories, where confinement is predominantly spontaneously generate…