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Unparticle Physics
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abstract
I discuss some simple aspects of the low-energy physics of a nontrivial scale invariant sector of an effective field theory -- physics that cannot be described in terms of particles. I argue that it is important to take seriously the possibility that the unparticle stuff described by such a theory might actually exist in our world. I suggest a scenario in which some details of the production of unparticle stuff can be calculated. I find that in the appropriate low energy limit, unparticle stuff with scale dimension $d_{\mathcal{U}}$ looks like a non-integral number $d_{\mathcal{U}}$ of invisible particles. Thus dramatic evidence for a nontrivial scale invariant sector could show up experimentally in missing energy distributions.
Forward citations
Cited by 13 Pith papers
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Strongly Coupled Sectors in Inflation: Gapless Theories and Unparticles
Computes inflationary bispectra and trispectra from tree-level unparticle exchanges using Mellin-Barnes methods and symmetry-based differential equations, revealing that full shapes are needed to distinguish unparticl...
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Chiral and isospin breaking in the two-flavor Schwinger Model
A new dilaton-based effective theory predicts the pion mass splitting in the massive two-flavor Schwinger model, and lattice data match both this prediction and the exact sine-Gordon scaling.
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Non-perturbative Effects and Unparticle Physics in Generalized Schwinger Models
In a class of exactly solvable generalized Schwinger models, all normalized low-dimension operators with the same chiral charge flow to a single unparticle operator at long distances.
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Massive Graviton Dark Matter from a Gapped Continuum
Radiative corrections pull an isolated, long-lived massive graviton out of the gapped linear-dilaton continuum, giving a sub-MeV dark-matter candidate that can coexist with a holographic fluid component.
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Neutrino Dipole Moments and Radiative Signatures from Partial Compositeness
Partial compositeness with inverse seesaw yields neutrino dipole moments of 10^{-6} to 10^{-8} GeV^{-1} and predicts single- and multi-photon radiative signals at MiniBooNE and MINERvA.
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Scale-Invariant Open Quantum Systems
Scale-invariant open quantum systems are universally described by unparticle baths with scaling dimension d_U, producing non-Markovian kernels, a fractional Caldeira-Leggett master equation, and phase transitions at d...
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Phenomenology of a Kinetic Higgs Portal
A momentum-dependent Higgs portal can hide invisible decays, make four-top production the most sensitive probe, and open a dark-matter region immune to direct detection.
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Invisible jets from composite neutrinos
Neutrino scattering into composite invisible jets would enhance the neutral-to-charged current ratio, and NuTeV plus SHiP/FPF data can probe or exclude this scenario.
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Unnuclear matter at large-charge
In the large-charge EFT of neutrons, effective-range corrections to the two-point function first appear at second order in the effective range, and the deformed theory has a narrow but usable perturbative window for Q...
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Conformal Freeze-In from Neutrino Portal
A conformal freeze-in model with a neutrino portal can produce the observed dark matter abundance and, in part of its parameter space, the neutrino mass scale, while evading X-ray constraints for composite sterile-neu...
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Quantum Critical Higgs: From AdS$_5$ to Colliders
In QCH models the large enhancement expected in gg to ZZ cancels once the correct i epsilon branch is used, while gg to HZ develops an order-of-magnitude excess at high invariant mass.
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Short-range production of three bottom mesons
Leading-order predictions for three-body point production rates of B and B* meson systems are derived in short-range NREFT from two-body input alone.
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Neither a field nor a matter: The case of energy
Energy is the actuality of formal properties in quantum fields, distinct from matter and mass, and is a primary, irreducible component of physical reality.
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