Tom Rivlin
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View article: The propagation of seismic waves, misinformation, and disinformation from the 2024-10-05 M 4.5 Iran earthquake
The propagation of seismic waves, misinformation, and disinformation from the 2024-10-05 M 4.5 Iran earthquake Open
The 2024-10-05 Iran M 4.5 earthquake took place at a time of heightened tensions in the Middle East. We perform a discrimination and moment tensor analysis and identify a shallow-dipping, reverse fault source commensurate with the compress…
View article: Emergence of a Second Law of Thermodynamics in Isolated Quantum Systems
Emergence of a Second Law of Thermodynamics in Isolated Quantum Systems Open
The second law of thermodynamics states that the entropy of an isolated system can only increase over time. This appears to conflict with the reversible evolution of isolated quantum systems under the Schrödinger equation, which preserves …
View article: Emergence of a second law of thermodynamics in isolated quantum systems
Emergence of a second law of thermodynamics in isolated quantum systems Open
The second law of thermodynamics states that the entropy of an isolated system can only increase over time. This appears to conflict with the reversible evolution of isolated quantum systems under the Schrödinger equation, which preserves …
View article: Equilibration of objective observables in a dynamical model of quantum measurements
Equilibration of objective observables in a dynamical model of quantum measurements Open
The challenge of understanding quantum measurement persists as a fundamental issue in modern physics. Particularly, the abrupt and energy-non-conserving collapse of the wave function appears to contradict classical thermodynamic laws. The …
View article: Nonadiabatic Couplings Can Speed Up Quantum Tunneling Transition Path Times
Nonadiabatic Couplings Can Speed Up Quantum Tunneling Transition Path Times Open
Quantum tunneling is known to play an important role in the dynamics of systems with nonadiabatic couplings. However, until recently, the time-domain properties of nonadiabatic scattering have been severely under-explored. Using numericall…
View article: Transition Path Flight Times and Nonadiabatic Electronic Transitions
Transition Path Flight Times and Nonadiabatic Electronic Transitions Open
Transition path flight times are studied for scattering on two electronic surfaces with a single crossing. These flight times reveal nontrivial quantum effects such as resonance lifetimes and nonclassical passage times and reveal that nona…
View article: Superluminal tunneling times without superluminal signaling: Fading of the MacColl-Hartman effect at early times
Superluminal tunneling times without superluminal signaling: Fading of the MacColl-Hartman effect at early times Open
A curious feature of quantum tunneling known as the MacColl-Hartman effect results in the numerical observation that particles can traverse a barrier with effective superluminal speed. However, because tunneling is never certain, any attem…
View article: The Quantum Eraser from a Weak Values Perspective
The Quantum Eraser from a Weak Values Perspective Open
The quantum eraser variant of the double-slit experiment, and its 'delayed choice' sub-variant, are considered from the perspective of weak value and weak measurement theory (which is briefly reintroduced here). The interference fringes th…
View article: The Influence of the Symmetry of Identical Particles on Flight Times
The Influence of the Symmetry of Identical Particles on Flight Times Open
In this work, our purpose is to show how the symmetry of identical particles can influence the time evolution of free particles in the nonrelativistic and relativistic domains as well as in the scattering by a potential δ-barrier. For this…
View article: Comparison of a direct measure of barrier crossing times with indirect measures such as the Larmor time
Comparison of a direct measure of barrier crossing times with indirect measures such as the Larmor time Open
Different approaches for considering barrier crossing times are analyzed, with special emphasis on recent experiments which attempt to measure what is commonly referred to as the Larmor tunneling time. We show that that these experiments c…
View article: The relativistic tunneling flight time may be superluminal, but it does not imply superluminal signaling
The relativistic tunneling flight time may be superluminal, but it does not imply superluminal signaling Open
Wavepacket tunneling, in the relativistic limit, is studied via solutions to the Dirac equation for a square barrier potential. Specifically, the arrival time distribution (the time-dependent flux) is computed for wavepackets initiated far…
View article: Low-temperature scattering with the R-matrix method: from nuclear scattering to atom-atom scattering and beyond
Low-temperature scattering with the R-matrix method: from nuclear scattering to atom-atom scattering and beyond Open
The R-matrix method is a fully-quantum time-independent scattering method, used to simulate nuclear, electron-atom, electron-ion, electron-molecule scattering and more. Here, a novel R-matrix method, RmatReact, is presented as applied to u…
View article: Low temperature scattering with the R-matrix method: the Morse potential
Low temperature scattering with the R-matrix method: the Morse potential Open
Experiments are starting to probe collisions and chemical reactions between atoms and molecules at ultra-low temperatures. We have developed a new theoretical procedure for studying these collisions using the R-matrix method. Here this met…
View article: Original Research By Young Twinkle Students (ORBYTS): when can students start performing original research?
Original Research By Young Twinkle Students (ORBYTS): when can students start performing original research? Open
Involving students in state-of-the-art research from an early age eliminates the idea that science is only for the scientists and empowers young people to explore STEM (Science, Technology, Engineering and Maths) subjects. It is also a gre…
View article: Phys FilmMakers: teaching science students how to make YouTube-style videos
Phys FilmMakers: teaching science students how to make YouTube-style videos Open
Phys FilmMakers (PFM) is a new type of course in which a science expert and science communicator partner teach physics students how to make YouTube-style videos on cutting-edge scientific research within the university department. Here, we…
View article: The Rivlin dataset for 23Na1H
The Rivlin dataset for 23Na1H Open
The dataset is an archive of ExoMol page, https://exomol.com/data/molecules/NaH/23Na-1H/Rivlin. Please check the reference details according to the following description or directly from the website.Definitions file:23Na-1H__Rivlin.defRoot…
View article: The Rivlin dataset for 23Na1H
The Rivlin dataset for 23Na1H Open
The dataset is an archive of ExoMol page, https://exomol.com/data/molecules/NaH/23Na-1H/Rivlin. Please check the reference details according to the following description or directly from the website.Definitions file:23Na-1H__Rivlin.defRoot…
View article: Low-temperature chemistry using the R-matrix method
Low-temperature chemistry using the R-matrix method Open
Techniques for producing cold and ultracold molecules are enabling the study of chemical reactions and scattering at the quantum scattering limit, with only a few partial waves contributing to the incident channel, leading to the observati…
View article: ExoMol molecular line lists – X. The spectrum of sodium hydride
ExoMol molecular line lists – X. The spectrum of sodium hydride Open
Accurate and complete rotational, rotational-vibrational and rotational-vibrational-electronic line lists are calculated for sodium hydride: both the NaH and NaD isotopologues are considered. These line lists cover all ro-vibrational state…