An ultracold atomic gas is used as a self-contained miniuniverse to show that time can be defined without an external clock. It’s demonstrated that entropy exchange between different sectors of the system provides an internal time that robustly orders the dynamics and yields a Schr\ odinger description of the observed evolution.
A new experiment probes the quantum geometry of electronic wave functions involved in a nonlinear Hall response.
The transport properties of quantum materials often vary periodically with the strength of an applied magnetic field. These quantum oscillations have long provided physicists with an indispensable tool for extracting subtle, otherwise-inaccessible information on electronic phases of matter [1]. Now an experiment by Jinrui Zhong of the Beijing Institute of Technology and his colleagues has revealed a novel kind of quantum oscillation in moiré systems [2]. These are materials made from stacked monolayers that are twisted with respect to each other to create, in effect, atomic lattices with much wider unit cells. The experiment pointed to a special mechanism for facilitating the novel periodic fluctuations: the emergence of so-called Brown-Zak fermions.
The ability to control the movement of negatively charged particles (i.e., electrons) is central to the functioning of all modern electronic devices. This control is typically attained using a gate, an electrode via which an applied electric field alters a material’s electrical properties.
In many electronic devices, the effectiveness of electrical gating depends on a device’s capacitance (i.e., a measure of how much electric charge can be induced or stored for a given voltage). Recently, however, electronics engineers have been exploring the potential of new materials that exhibit unusual collective electron behaviors, which could be leveraged to surpass the gating performance of contemporary electronics.
Researchers at University of California, Los Angeles (UCLA) and University of California, Riverside (UCR) recently demonstrated the potential of a new quasi-one-dimensional (1D) quantum material, showing that it can dramatically enhance the electrical control of collective electronic states known as charge density waves (CDWs).
Trinity’s Prof. Stefan Sint, along with collaborators from Germany, Spain and Italy, has published the most precise determination to date of the strong coupling constant. This parameter governs the interactions between quarks and gluons, the fundamental components of nuclear matter. The new result halves the error of all previous experimental measurements combined, setting a new benchmark for the Standard Model, which summarizes our current knowledge of elementary particle physics.
This advance will improve our understanding of how quarks and gluons behave inside protons and enable high-precision measurements of the Higgs boson and its properties. More generally, improved quantitative control of the strong interactions increases the likelihood of discovering effects of yet unknown physics at CERN’s Large Hadron Collider (LHC).
Prof. Sint from Trinity’s School of Mathematics was one of the researchers whose landmark results were published in Nature.
A team of researchers has leveraged a supercomputer at the U.S. Department of Energy’s (DOE) Argonne National Laboratory to reveal the internal structure of a pion in unprecedented detail. The findings are published in the Journal of High Energy Physics.
Pions are subatomic particles that help bind matter at some of the smallest scales in nature. They are closely connected to the strong nuclear force, the fundamental force that holds protons and neutrons together inside atomic nuclei. Understanding how pions work can help scientists explain how matter forms at its most fundamental level.
“Pions mediate the strong force that binds nucleons—that is, the protons and neutrons that account for an atom’s mass,” said Yong Zhao, an Argonne physicist and principal investigator on the project.
In the next few decades, many physicists are hopeful that nuclear fusion could become a realistic source of practically limitless energy. But before this can happen, it will be critical to ensure that reactors cannot be covertly misused to produce materials for nuclear weapons.
Through new analysis published in Physical Review Applied, a team led by Patrick Huber at Virginia Tech has shown that an existing type of particle detector could be used to flag any such misuse.
What is matter, really? Is matter an independent substance, or is reality fundamentally relational? In this episode, we explore some of the deepest questions in philosophy, metaphysics, and modern science, including Quantum Physics, Relativity, Quantum Field Theory, Dark Matter, Consciousness, Space, Time, Cosmology, and the Nature of Reality itself.
From atoms and particles to galaxies and the Universe, modern science increasingly points toward a world of processes, relationships, and dynamic structures rather than isolated objects. Could Matter and Consciousness be different expressions of the same underlying Reality? What can Systems Thinking, Complexity Theory, Nonduality, Taoism, Buddhism, and Vedanta contribute to our understanding of existence?
Let us examine the Nature of Matter, the mystery of Dark Matter, the meaning of Space-Time, and the interconnected fabric of the cosmos. This exploration may challenge the way you think about Reality, Existence, Consciousness, and your place within the Universe.
#QuantumPhysics #Consciousness #NatureOfReality #WhatIsMatter #Relativity #QuantumFieldTheory #DarkMatter #Universe #Cosmology #Philosophy #Metaphysics #ScienceAndPhilosophy #NonDuality #Taoism #Buddhism #Vedanta #SystemsThinking #ComplexityTheory #Interconnectedness #meaningoflife.
0:00 Intro.
0:55 A Necessary Correction of Attitude.
4:39 What is Matter?
8:09 Rethinking Properties.
10:34 An Important Question.
14:11 Redefining Matter.
17:43 Outro.
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Researchers boosted the sensitivity for measurements of the motion of a levitated nanoparticle, with potential uses in dark matter searches.
Researchers have a bold plan to detect unknown fundamental particles: Levitate a nanoscale object in a vacuum and watch for a microscopic recoil caused by a collision with an exotic particle. Precision measurements of macroscopic objects have been a challenge, but now a research team has demonstrated a significant sensitivity improvement with a levitated object some 6 orders of magnitude larger than in previous experiments [1]. The team hopes the method will find use in experimental searches in the next few years.
Searching for particles not accounted for by the standard model of particle physics requires experiments with unprecedented sensitivity. One method is to use laser light to levitate a small object in a vacuum, isolating it from surrounding noise. Researchers can monitor its motion and potentially detect minuscule recoils caused by rare collisions with exotic particles, such as those of dark matter.
A University of Birmingham scientist has built a “mini-universe” that takes a step toward answering one of science’s biggest questions: “What is time?” Publishing his findings in Physical Review Research, Professor Giovanni Barontini shows how it is possible to measure the flow of time without using a clock at all. The new findings provide a scientific model in which a version of time emerges from the experiment itself.
Some theories of physics, such as the Wheeler–DeWitt equation, suggest that, at its deepest level, the universe has no built-in time but exists as a single, unchanging quantum state in which particles exhibit both wave-like and particle-like properties. It treats the universe as a whole with no external clock, and any sense of time must emerge from internal relationships between parts.