# A note on Infraparticles and Unparticles

@article{Schroer2008ANO, title={A note on Infraparticles and Unparticles}, author={Bert Schroer}, journal={arXiv: High Energy Physics - Theory}, year={2008} }

The observed astrophysical phenomenon of dark matter has generated new interest in the problem of whether the principles underlying QFT are consistent with invisibility/inertness of energy-momentum carrying "stuff" as e.g. "unparticles". We show that the 2-dim. model which has been used to illustrate the meaning of unparticles belongs to the class of former infraparticles models and the latter are known to describe electrically charged particles in d=1+3 which despite their nonlocality are our…

## 13 Citations

### Indecomposable semiinfinite string-localized positive energy matter and "darkness"

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The crossing property is perhaps the most subtle aspect of the particle-field relation. Although it is not difficult to state its content in terms of certain analytic properties relating different…

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We show that there are significant conceptual differences between QM and QFT which make it difficult to view the latter as just a relativistic extension of the principles of QM. At the root of this…

### Jorge A. Swieca’s contributions to quantum field theory in the 60s and 70s and their relevance in present research

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Abstract.
After revisiting some high points of particle physics and QFT of the two decades from
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### String theory and the crisis of particle physics II or the ascent of metaphoric arguments

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We show that there are significant conceptual differences between QM and QFT which make it difficult to view the latter as just a relativistic extension of the principles of QM. At the root of this…

### Unparticle example in 2D.

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It is argued that the exactly soluble 2D theory of a massless fermion coupled to a massive vector boson, the Sommerfield model, is an interesting analog of a Banks-Zaks model, approaching a free theory at high energies and a scale-invariant theory with nontrivial anomalous dimensions at low energies.

## References

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### Indecomposable semiinfinite string-localized positive energy matter and "darkness"

- Physics
- 2008

In the absence of interactions indecomposable positive energy quantum matter comes in form of three families of which the massless so called ”infinite spin” family which appeared first in Wigner’s…

### A Critical Look at 50 Years Particle Theory from the Perspective of the Crossing Property

- Physics
- 2009

The crossing property is perhaps the most subtle aspect of the particle-field relation. Although it is not difficult to state its content in terms of certain analytic properties relating different…

### String theory and the crisis of particle physics II

- Education
- 2006

This is a completely reformulated presentation of a previous paper hep-th/0611132 with the same title; this time with a much stronger emphasis on conceptual aspects of string theory and a detailed…

### Localization and the interface between quantum mechanics, quantum field theory and quantum gravity dedicated to the memory of Rob Clifton submitted to "Studies in History and Philosophy of Physics"

- Physics
- 2007

We show that there are significant conceptual differences between QM and QFT which make it difficult to view the latter as just a relativistic extension of the principles of QM. At the root of this…

### Jorge A. Swieca’s contributions to quantum field theory in the 60s and 70s and their relevance in present research

- Physics
- 2009

Abstract.
After revisiting some high points of particle physics and QFT of the two decades from
1960 to 1980, I comment on the work by Jorge André Swieca. I explain how it fits into the
quantum field…

### String theory and the crisis of particle physics II or the ascent of metaphoric arguments

- Education
- 2006

This is a completely reformulated presentation of a previous paper with the same title; this time with a much stronger emphasis on conceptual aspects of string theory and a detailed review of its…

### Unparticle example in 2D.

- PhysicsPhysical review letters
- 2008

It is argued that the exactly soluble 2D theory of a massless fermion coupled to a massive vector boson, the Sommerfield model, is an interesting analog of a Banks-Zaks model, approaching a free theory at high energies and a scale-invariant theory with nontrivial anomalous dimensions at low energies.