389 citations · 960 across the 38 of their papers we have counts for
7 papers · 1 filter
Anthropic constraints on fermion masses
Alejandro Jenkins
We summarize the results of previous research on the constraints imposed on quark masses by the anthropically-motivated requirement that there exist stable nuclei with the right ch…
The Story of \cal O: Positivity constraints in effective field theories
Alejandro Jenkins, Donal O'Connell
We propose a simple method for identifying operators in effective field theories whose coefficients must be positive by causality. We also attempt to clarify the relationship betwe…
Topics in particle physics and cosmology beyond the standard model
Alejandro Jenkins
We review the interpretation of gauge invariance as a mathematical redundancy required in a relativistic description of forces mediated by massless spin-1 and spin-2 particles. In…
Spontaneous Lorentz Violation and the Long-Range Gravitational Preferred-Frame Effect
Michael L. Graesser, Alejandro Jenkins, Mark B. Wise
Lorentz-violating operators involving Standard Model fields are tightly constrained by experimental data. However, bounds are more model-independent for Lorentz violation appearing…
Composite Mediators and Lorentz Violation
Alejandro Jenkins
We briefly review the history and current status of models of particle interactions in which massless mediators are given, not by fundamental gauge fields as in the Standard Model,…
Anthropic Distribution for Cosmological Constant and Primordial Density Perturbations
Michael L. Graesser, Stephen D. H. Hsu, Alejandro Jenkins +1
The anthropic principle has been proposed as an explanation for the observed value of the cosmological constant. Here we revisit this proposal by allowing for variation between uni…