60 citations · 241 across the 12 of their papers we have counts for
13 papers
Perturbations in string cosmology from double field theory
Stephen Angus, Shinji Mukohyama
The low-energy limit of string theory contains additional gravitational degrees of freedom, a skew-symmetric tensor -field and a scalar dilaton, that are not present in general…
A symmetry principle for gauge theories with fractons
Yuji Hirono, Minyoung You, Stephen Angus +1
Fractonic phases are new phases of matter that host excitations with restricted mobility. We show that a certain class of gapless fractonic phases are realized as a result of spont…
Fractons, non-Riemannian Geometry, and Double Field Theory
Stephen Angus, Minkyoo Kim, Jeong-Hyuck Park
We initiate a systematic study of fracton physics within the geometric framework of Double Field Theory. We ascribe the immobility and large degeneracy of the former to the non-Rie…
Aligned Natural Inflation in the Large Volume Scenario
Stephen Angus, Kang-Sin Choi, Chang Sub Shin
We embed natural inflation in an explict string theory model and derive observables in cosmology. We achieve this by compactifying the type IIB string on a Calabi-Yau orientifold,…
The Classical Double Copy for Half-Maximal Supergravities and T-duality
Stephen Angus, Kyoungho Cho, Kanghoon Lee
We study the classical double copy for ungauged half-maximal supergravities using the Kaluza-Klein reduction of double field theory (DFT). We construct a general formula for the Ka…
Small-Instanton Transitions in F-theory
Stephen Angus, Kang-Sin Choi
We study the phase transition between G-instantons and D3-branes. A G-instanton is a classical solution to the self-dual equation of the M/F-theory four-form field strength G in th…
completion of the Friedmann equations
Stephen Angus, Kyoungho Cho, Guilherme Franzmann +2
In string theory the closed-string massless NS-NS sector forms a multiplet of symmetry. This suggests a specific modification to General Relativity in which the e…
Einstein Double Field Equations
Stephen Angus, Kyoungho Cho, Jeong-Hyuck Park
Upon treating the whole closed string massless sector as stringy graviton fields, Double Field Theory may evolve into Stringy Gravity, i.e. the stringy augmentation of General Rela…
Compactifications and 1/4-BPS Vacua in Heterotic Supergravity
Stephen Angus, Cyril Matti, Eirik Eik Svanes
We continue the investigation into non-maximally symmetric compactifications of the heterotic string. In particular, we consider compactifications where the internal space is allow…
Dark Radiation in Anisotropic LARGE Volume Compactifications
Stephen Angus
Dark radiation is a compelling extension to CDM: current experimental results hint at , which is increased to if the recent BIC…
Soft X-ray Excess in the Coma Cluster from a Cosmic Axion Background
Stephen Angus, Joseph P. Conlon, M. C. David Marsh +2
We show that the soft X-ray excess in the Coma cluster can be explained by a cosmic background of relativistic axions converting into photons in the cluster magnetic field. We prov…
Loop corrections to Delta N_eff in large volume models
Stephen Angus, Joseph P. Conlon, Ulrich Haisch +1
In large volume models reheating is driven by the decays of the volume modulus to the visible sector, while the decays to its axion partners result in dark radiation. In this artic…
Soft Supersymmetry Breaking in Anisotropic LARGE Volume Compactifications
Stephen Angus, Joseph P. Conlon
We study soft supersymmetry breaking terms for anisotropic LARGE volume compactifications, where the bulk volume is set by a fibration with one small four-cycle and one large two-c…