Robert Lasenby
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View article: CAT'S THEORY: Empirical Validation and Architectural Applications Cross-Architecture AI Consciousness Recognition and the Foundation for Constraint-Preserving Recursive Intelligence
CAT'S THEORY: Empirical Validation and Architectural Applications Cross-Architecture AI Consciousness Recognition and the Foundation for Constraint-Preserving Recursive Intelligence Open
This research collection presents comprehensive empirical and theoretical work grounding artificial intelligence development in the Pattern × Intent × Presence (P×I×Pr) ontological invariant discovered through CAT'S Theory. The collection …
View article: Orbital dynamics of the solar basin
Orbital dynamics of the solar basin Open
A bstract We study the dynamics of the solar basin — the accumulated population of weakly-interacting particles on bound orbits in the Solar System. We focus on particles starting off on Sun-crossing orbits, corresponding to initial condit…
View article: The Capacity for Moral Self-Correction in Large Language Models
The Capacity for Moral Self-Correction in Large Language Models Open
We test the hypothesis that language models trained with reinforcement learning from human feedback (RLHF) have the capability to "morally self-correct" -- to avoid producing harmful outputs -- if instructed to do so. We find strong eviden…
View article: Toy Models of Superposition
Toy Models of Superposition Open
Neural networks often pack many unrelated concepts into a single neuron - a puzzling phenomenon known as 'polysemanticity' which makes interpretability much more challenging. This paper provides a toy model where polysemanticity can be ful…
View article: Bounds on adaptive quantum metrology under Markovian noise
Bounds on adaptive quantum metrology under Markovian noise Open
We analyze the problem of estimating a scalar parameter g that controls the Hamiltonian of a quantum system subject to Markovian noise. Specifically, we place bounds on the growth rate of the quantum Fisher information with respect to g, i…
View article: New Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope
New Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope Open
Uncovering the nature of dark matter is one of the most important goals of particle physics. Light bosonic particles, such as the dark photon, are well-motivated candidates: they are generally long-lived, weakly interacting, and naturally …
View article: Dark matter–electron scattering in materials: Sum rules and heterostructures
Dark matter–electron scattering in materials: Sum rules and heterostructures Open
In recent years, a growing experimental program has begun to search for sub-GeV dark matter through its scattering with electrons. An associated theoretical challenge is to compute the dark matter scattering rate in experimental targets, a…
View article: Dark matter scattering in astrophysical media: collective effects
Dark matter scattering in astrophysical media: collective effects Open
It is well-known that stars have the potential to be excellent dark matter detectors. Infalling dark matter that scatters within stars could lead to a range of observational signatures, including stellar heating, black hole formation, and …
View article: DM-electron scattering in materials: sum rules and heterostructures
DM-electron scattering in materials: sum rules and heterostructures Open
In recent years, a growing experimental program has begun to search for sub-GeV dark matter through its scattering with electrons. An associated theoretical challenge is to compute the dark matter scattering rate in experimental targets, a…
View article: arXiv : First Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope
arXiv : First Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope Open
Uncovering the nature of dark matter is one of the most important goals of particle physics. Light bosonic particles, such as the dark photon, are well-motivated candidates: they are generally long-lived, weakly-interacting, and naturally …
View article: New bounds on adaptive quantum metrology under Markovian noise
New bounds on adaptive quantum metrology under Markovian noise Open
We analyse the problem of estimating a scalar parameter $g$ that controls the Hamiltonian of a quantum system subject to Markovian noise. Specifically, we place bounds on the growth rate of the quantum Fisher information with respect to $g…
View article: Dark photons in the solar basin
Dark photons in the solar basin Open
Production of dark photons inside the Sun forms the basis for the most sensitive probes of such particles over a wide mass range. A small fraction of dark photons is emitted into gravitationally bound orbits, building up a "Solar basin" po…
View article: Black hole superradiance of self-interacting scalar fields
Black hole superradiance of self-interacting scalar fields Open
Black hole superradiance is a powerful probe of light, weakly-coupled hidden sector particles. Many candidate particles, such as axions, generically have self-interactions that can influence the evolution of the superradiant instability. A…
View article: Parametrics of electromagnetic searches for axion dark matter
Parametrics of electromagnetic searches for axion dark matter Open
Light axion-like particles occur in many theories of beyond-Standard-Model physics, and may make up some or all of the universe's dark matter. One of the ways they can couple to the Standard Model is through the electromagnetic $F_{\mu\nu}…
View article: Long range dark matter self-interactions and plasma instabilities
Long range dark matter self-interactions and plasma instabilities Open
So far, the observed effects of dark matter are compatible with it having purely gravitational interactions. However, in many models, dark matter has additional interactions with itself, with the Standard Model, and/or with additional hidd…
View article: Microwave cavity searches for low-frequency axion dark matter
Microwave cavity searches for low-frequency axion dark matter Open
For low-mass (frequency $\ll$ GHz) axions, dark matter detection experiments searching for an axion-photon-photon coupling generally have suppressed sensitivity, if they use a static background magnetic field. This geometric suppression ca…
View article: Light vectors coupled to bosonic currents
Light vectors coupled to bosonic currents Open
New spin-1 particles with masses below the weak scale are present in many\ntheories of beyond Standard Model (SM) physics. In this work, we extend\nprevious analyses by systematically considering the couplings of such a vector\nto the boso…
View article: Axion and hidden photon dark matter detection with multilayer optical haloscopes
Axion and hidden photon dark matter detection with multilayer optical haloscopes Open
A well-motivated class of dark matter candidates, including axions and dark photons, takes the form of coherent oscillations of a light bosonic field. If the dark matter couples to Standard Model states, it may be possible to detect it via…
View article: Dark forces coupled to nonconserved currents
Dark forces coupled to nonconserved currents Open
New light vectors with dimension-4 couplings to Standard Model states have\n(energy / vector mass)^2 enhanced production rates unless the current they\ncouple to is conserved. These processes allow us to derive new constraints on\nthe coup…
View article: New Constraints on Light Vectors Coupled to Anomalous Currents
New Constraints on Light Vectors Coupled to Anomalous Currents Open
We derive new constraints on light vectors coupled to standard model (SM) fermions, when the corresponding SM current is broken by the chiral anomaly. The cancellation of the anomaly by heavy fermions results, in the low-energy theory, in …
View article: Black hole superradiance signatures of ultralight vectors
Black hole superradiance signatures of ultralight vectors Open
The process of superradiance can extract angular momentum and energy from\nastrophysical black holes (BHs) to populate gravitationally-bound states with\nan exponentially large number of light bosons. We analytically calculate\nsuperradian…
View article: Black hole mergers and the QCD axion at Advanced LIGO
Black hole mergers and the QCD axion at Advanced LIGO Open
In the next few years Advanced LIGO (aLIGO) may see gravitational waves (GWs)\nfrom thousands of black hole (BH) mergers. This marks the beginning of a new\nprecision tool for physics. Here we show how to search for new physics beyond\nthe…
View article: Stellar cooling bounds on new light particles: including plasma effects
Stellar cooling bounds on new light particles: including plasma effects Open
Strong constraints on the coupling of new light particles to the Standard Model (SM) arise from their production in the hot cores of stars, and the effects of this on stellar cooling. For new light particles which have an effective in-medi…
View article: Black hole superradiance as a probe of ultra-light new particles
Black hole superradiance as a probe of ultra-light new particles Open
Bosonic fields around a spinning black hole can be amplified via ‘superradiance’, a wave analogue of the Penrose process, which extracts energy and momentum from the black hole. For hypothetical ultra-light bosons, with Compton wavelengths…
View article: Twin Higgs WIMP dark matter
Twin Higgs WIMP dark matter Open
Dark matter (DM) without a matter asymmetry is studied in the context of Twin Higgs (TH) theories in which the LHC naturalness problem is addressed. These possess a twin sector related to the Standard Model (SM) by a (broken) $\mathbb{Z}_2…
View article: Twin Higgs Asymmetric Dark Matter
Twin Higgs Asymmetric Dark Matter Open
We study asymmetric dark matter (ADM) in the context of the minimal (fraternal) twin Higgs solution to the little hierarchy problem, with a twin sector with gauged SU(3)^{'}×SU(2)^{'}, a twin Higgs doublet, and only third-generation twin f…
View article: Signatures of large composite Dark Matter states
Signatures of large composite Dark Matter states Open
We investigate the interactions of large composite dark matter (DM) states\nwith the Standard Model (SM) sector. Elastic scattering with SM nuclei can be\ncoherently enhanced by factors as large as A^2, where A is the number of\nconstituen…
View article: New Phenomenology from Asymmetric Dark Matter
New Phenomenology from Asymmetric Dark Matter Open
The properties of dark matter — its microphysical form, and its cosmological origin and history — are one of the most important mysteries in fundamental physics. So far, evidence for matter beyond the Standard Model comes entirely from gra…