Massive Photons: An Infrared Regularization Scheme for Lattice QCD plus QED

Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions

Massive photons: an infrared regularization scheme for lattice QCD+QED

Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions.Comment: 6 pages, 4 figures, 2 tables; significant revisions to abstract and main text; revised presentation of results for clarity (results unchanged); acknowledgements updated; matches published versio

Electric dipole moments and the search for new physics

Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well beyond those reached directly at high energy colliders. Discrimination between different physics models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss the current status and prospects in the near future for a compelling suite of such experiments, along with developments needed in the encompassing theoretical framework.Comment: Contribution to Snowmass 2021; updated with community edits and endorsement

Photon mass term as an IR regularization for QCD+QED on the lattice

Inclusion of QED in lattice QCD calculations can lead to power-law volume artifacts as a consequence of the long-range nature of the interaction. Such artifacts must be removed by extrapolation in order to attain reliable infinite volume estimates of observables and quantities derived from them. As an alternative to this methodology, we consider the use of a photon mass term as an infrared regulator for QCD+QED, and explore the viability of its use in determining hadron mass shifts and splittings

A Case of Subcortical Dementia Due to Sarcoidosis of the Hypothalamus and Fornices

A Patient with Sarcoidosis Involving Predominantly the Hypothalamus and Fornices Was Evaluated for Dementia. He Showed a Relative Sparing of Fund of Knowledge and Orientation. Memory Skills, Particularly Short-Term Memory, Were Severely Impaired. Behavioral Changes Included Apathy and a Lack of Spontaneity. Insight Was Relatively Preserved. the Pattern of His Deficits Showed Some Similarities to the Pattern Reported in Patients with Huntington\u27s Disease and Was Different from that Described in Alzheimer\u27s Disease. the Dementia Caused by Subcortical Pathology May Differ in Important Respects from that Caused by Diffuse Cortical Dysfunction. © 1983

Altered Patterns of Word Associations in Dementia and Aphasia

The Word Associations of 38 Demented, 17 Aphasic, and 22 Normal Subjects Were Studied. Both Normal and Brain-Injured Subjects Appear to Make Judgments About the Grammatical Class of the Word Stimulus. Certain Stimulus Words (Especially Nouns and Adjectives) Elicit Paradigmatic Responses Whereas Other Words (Especially Verbs and Adverbs) Elicit Syntagmatic Responses. the Mechanism Producing Syntagmatic Responses Seems Relatively Resistant to Deterioration in Dementia or Aphasia. However, in Dementia the Mechanism that Generates Paradigmatic Responses Becomes Progressively Less Efficient (Possibly Due to a Loss of Semantic Markers) and Consequently More Random (Idiosyncratic) Responses Emerge. Perseverative Responses, Inhibited in Normal Subjects, Are More Prevalent in Dementia. Anomic Aphasics Show a Pattern of Word Associations Similar to that of Subjects with Mild Dementia. Broca\u27s Aphasics, While Making Fewer Paradigmatic Associations Than Normals, Retain Enough Self-Monitoring Mechanisms So that Few Idiosyncratic and Perseverative Responses Are Made While More Null Responses Occur. Wernicke\u27s Aphasics Show a Marked Shift Away from a Paradigmatic Word Association Strategy, Possibly Due to an Inability to Access Semantic Markers or a True Loss of These Markers. Metalinguistic Deficits (I.e., a Failure to Adopt an Appropriate Strategy) May Also Contribute to This Shift Away from Paradigmatic Associations. Furthermore, a Disruption of Self-Monitoring Mechanisms in Wernicke\u27s Aphasia Leads to an Increase in Perseverative and Idiosyncratic Responses. © 1984

Massive Photons: An Infrared Regularization Scheme for Lattice QCD+QED.

Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions