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Nuclear and High Energy Physics

Fundamental particles and nuclear physics, including particle accelerators, quarks and leptons, nuclear structure, particle detectors, and the search for new physics

10 papers

Papers

Visions in Quantum Gravity

This community report summarizes discussions from a Nordita program on Quantum Gravity, highlighting the current status, commonalities, and disagreements among various theoretical approaches. It covers fundamental questions like the nature of spacetime, unitarity, causality, and stability, as well as the prospects for observational detection of quantum gravity effects. The paper emphasizes the lack of consensus on many core issues and the ongoing challenges in bridging theoretical frameworks with experimental data.

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Nuclear and High Energy Physics Oct 11, 04:40 PM

Dark matter and dark energy in combinatorial quantum gravity

This theoretical paper suggests that both dark energy and dark matter are consequences of quantum gravity within a model where spacetime emerges from a discrete, random graph structure. Dark energy is attributed to ground-state curvature at finite coupling, and dark matter is explained as 'crystallographic' defects, analogous to allotropes in materials, in this spacetime fabric. The model predicts the existence of antigravity domains, arising from small areas of lower curvature, and identifies the Big Bang as a topological transition from randomness to spacetime.

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Nuclear and High Energy Physics Aug 16, 08:53 AM

Exactly Solvable Floquet Dynamics for Conformal Field Theories in Dimensions Greater than Two

The paper investigates the dynamics of conformal field theories (CFTs) in 3+1 dimensions under periodic driving protocols involving different deformations of the CFT Hamiltonian. By employing conformal transformations and a quaternion formalism, the authors calculate quantities like fidelity, unequal-time correlators, and energy density, demonstrating the existence of heating and non-heating phases depending on the drive parameters. For protocols with a single SU(1,1) subalgebra of the conformal group involved, the Floquet Hamiltonian is derived, enabling the study of dynamical phase transitions.

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Nuclear and High Energy Physics Jul 16, 12:19 PM

The anomalous magnetic moment of the muon in the Standard Model

The Standard Model calculation of the muon anomalous magnetic moment is a complex undertaking, involving contributions from QED, electroweak interactions, and hadronic effects. The current theoretical prediction differs from the experimental measurement by 3.7 standard deviations, suggesting the potential presence of new physics. However, the uncertainties associated with the hadronic contributions, particularly HVP and HLbL, are still significant and limit the ability to draw definitive conclusions.

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Nuclear and High Energy Physics Jul 14, 06:50 AM

Magnetic control of tokamak plasmas through deep reinforcement learning

This paper demonstrates successful real-time control of plasma shape and position in a tokamak using deep reinforcement learning. The controller, trained in simulation and deployed directly on the TCV tokamak, successfully stabilized a variety of plasma configurations, including advanced shapes like snowflakes and even two independent plasmas (droplets). This approach simplifies control design compared to conventional methods and enables more flexible exploration of new plasma configurations.

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Nuclear and High Energy Physics Jul 14, 06:50 AM

Replica wormholes and the entropy of Hawking radiation

This paper demonstrates how non-perturbative effects from "replica wormholes" can resolve the late-time entropy discrepancy for Hawking radiation, leading to a unitary Page curve. By including these new saddle points in the gravitational path integral, the island rule for computing entropy emerges naturally, suggesting a new way to understand how information escapes black holes.

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Nuclear and High Energy Physics Jul 14, 06:50 AM