47 citations · 227 across the 17 of their papers we have counts for
21 papers
Automorphic Structures of Heterotic Vacua
Jacob M. Leedom, Nicole Righi, Alexander Westphal
We study moduli stabilization in 4D effective field theories with Sp(4,) self-duality inspired by heterotic orbifold compactifications with Wilson lines. The target-spa…
Towards a Heterotic Axiverse
Jacob M. Leedom, Margherita Putti, Alexander Westphal
In this paper we initiate a broad study of some central properties of the string axiverse arising from Calabi-Yau compactifications of the perturbative heterotic th…
Dark Matter Nuclear Magnetic Resonance is Sensitive to Dark Photons and the Axion-Photon Coupling
Carl Beadle, Sebastian A. R. Ellis, Jacob M. Leedom +1
We demonstrate that nuclear magnetic resonance based searches for dark matter (DM) have intrinsic and powerful sensitivity to dark photons and the axion-photon coupling. The reason…
Probing the UV with IR Axion Dark Matter Experiments
Jacob M. Leedom, Serah Moldovsky, Hitoshi Murayama
There is an ongoing and future experimental program searching for axions as both extensions of the Standard Model and as candidates for the observed dark matter. In this paper, we…
Exact Results in Chiral Gauge Theories with Flavor
Jacob M. Leedom, Hitoshi Murayama, Gup Singh +2
We present exact results in softly-broken supersymmetric chiral gauge theories with charged fermions in one antisymmetric, fundamental, and anti-…
Preheating Axions in String Cosmology
Jacob M. Leedom, Margherita Putti, Nicole Righi +1
Certain inflationary models can feature periods of preheating - an era preceding reheating during which parametric resonance triggers an exponential production of bosons. This non-…
Open Strings and Heterotic Instantons
Rafael Álvarez-García, Christian Kneißl, Jacob M. Leedom +1
Motivated by closed string perturbation theory arguments by S. Shenker, we consider non-perturbative effects of characteristic strength , with th…
Gravitational Axiverse Spectroscopy: Seeing the Forest for the Axions
Ema Dimastrogiovanni, Matteo Fasiello, Jacob M. Leedom +2
We consider inflationary models with multiple spectator axions coupled to dark gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields from the ax…
Generalized Narain Theories Decoded: Discussions on Eisenstein series, Characteristics, Orbifolds, Discriminants and Ensembles in any Dimension
Meer Ashwinkumar, Abhiram Kidambi, Jacob M. Leedom +1
We study a class of newly-introduced CFTs associated with even quadratic forms of general signature, which we call generalized Narain theories. We first summarize the properties of…
Implications of Protecting the QCD Axion in the Dual Description
Gongjun Choi, Jacob Leedom
The QCD axion can be be formulated in a dual description as a massive 2-form field. In this picture, the QCD axion quality problem translates into the question if there are additio…
Duality Origami: Emergent Ensemble Symmetries in Holography and Swampland
Meer Ashwinkumar, Jacob M. Leedom, Masahito Yamazaki
We discuss the interrelations between several ideas in quantum gravity -- holography, the Swampland, and the concept of ensemble averaging. To do so, we study ensemble averages of…
Heterotic de Sitter Beyond Modular Symmetry
Jacob M. Leedom, Nicole Righi, Alexander Westphal
We study the vacua of heterotic toroidal orbifolds using effective theories consisting of an overall Kähler modulus, the dilaton, and non-perturbative corrections to both the…
On the Sensitivity of Spin-Precession Axion Experiments
Jeff A. Dror, Stefania Gori, Jacob M. Leedom +1
A leading direction in the hunt for axion dark matter is to search for its influence on nuclear spins. The detection scheme involves polarizing a sample of nuclei within a strong s…
Chern-Simons Invariants from Ensemble Averages
Meer Ashwinkumar, Matthew Dodelson, Abhiram Kidambi +2
We discuss ensemble averages of two-dimensional conformal field theories associated with an arbitrary indefinite lattice with integral quadratic form . We provide evidence that…
Cosmological Tension of Ultralight Axion Dark Matter and its Solutions
Jeff A. Dror, Jacob M. Leedom
A number of proposed and ongoing experiments search for axion dark matter with a mass nearing the limit set by small scale structure (). We con…
Constraints on Dark Energy from Inflation and the Swampland Conjectures
Jacob M. Leedom
We discuss the prospects of measuring deviations of the dark energy equation of state from w=-1 by using the swampland conjectures to relate inflationary models to quintessence sce…
QCD Axion Dark Matter from a Late Time Phase Transition
Keisuke Harigaya, Jacob M. Leedom
We investigate the possibility that the Peccei-Quinn phase transition occurs at a temperature far below the symmetry breaking scale. Low phase transition temperatures are typical i…
Anomaly cancellation in effective supergravity from the heterotic string with an anomalous U(1)
Mary K. Gaillard, Jacob Leedom
We show that a choice of Pauli-Villars regulators allows the cancellation of all conformal and chiral anomalies in an effective field theory from Z_3 compactification of the hetero…
What does Inflation say about Dark Energy given the Swampland Conjectures?
Chien-I Chiang, Jacob M. Leedom, Hitoshi Murayama
We discuss the relations between swampland conjectures and observational constraints on both inflation and dark energy. Using the requirement , with as a un…
Anomaly cancellation in effective supergravity theories from the heterotic string: two simple examples
Mary K. Gaillard, Jacob Leedom
We use Pauli-Villars regularization to evaluate the conformal and chiral anomalies in the effective field theories from Z3 and Z7 compactifications of the heterotic string without…
Unified Models of the QCD Axion and Supersymmetry Breaking
Keisuke Harigaya, Jacob Leedom
Similarities between the gauge meditation of supersymmetry breaking and the QCD axion model suggest that they originate from the same dynamics. We present a class of models where s…