U.S. Department of Energy Office of Science的动态

Did Einstein lead us to the ACTUAL gravitic-force-carriers? No. Future CTP Gravitic Propulsion Systems are BOTH #postquantum and #postRelativity/#postRelativistic #newscience principles. #CTPGravityDrive

Dark energy is the mysterious force that's accelerating how fast our universe is expanding. While the first release of data from the Dark Energy Spectroscopic Instrument (DESI, led by Berkeley Lab) mostly matched up with current theory, there are hints that dark energy might be evolving, as covered in WIRED: https://lnkd.in/eDHAiGCa

?? CENTRA Research News! ?? Last week, Instituto Superior Técnico #MSc student David Fordham and #professor Ilídio Lopes published "Constraints on the axion-photon coupling using stellar modelling" in Physical Review D - American Physical Society! They have used #asteroseismology and #stellar modelling to explore the impact of #axionic production in late main-sequence stars. By comparing models with #observational data, they constrained the axion-photon #coupling parameter to an upper bound of 0.98×10?10?GeV?1 at 68% confidence and a conservative limit of 1.38×10?10?GeV?1 at 95% confidence. This method offers more stringent #bounds than most current direct axion detections and can be applied to #future asteroseismic data. Dive into the paper: https://lnkd.in/d8TuppJM

What are the limits of this concept? What are the limits of atomic physics? Where is the end of chemistry?” Endless atomic alignments, AGN holds the secrets.

I love it when history repeats itself. The quantum nature of light was first measured as the photo-electric effect, and so-it-goes with gravity. "Here we show that signatures of single gravitons from gravitational waves can be detected in near-future experiments, in essence, through a gravito-phononic analog of the photo-electric effect and continuous quantum measurement of energy eigen states." https://lnkd.in/gqFEewSr

NOT a Minute of Science - Day 9: Neutron Stars Started these videos in March 2021. If you have a particular concept you would like me to make a video about, write it in the comments! #science #Mathematics #technology #scienceisfun #engineering #steameducation #stemeducation #arts

One of the fundamental constants of nature, the fine-structure constant, determines so much about our Universe. Here’s why it matters. Diagram of atomic orbitals showing various shapes and labels, including s, p, d, and f orbitals, organized in a triangular structure with coordinate axes x, y, z. Each s orbital (red), each of the p orbitals (yellow), the d orbitals (blue) and the f orbitals (green) can contain only two electrons apiece: one spin up and one spin down in each one. The effects of spin, of moving close to the speed of light, and of the inherently fluctuating nature of the quantum fields that permeate the Universe are all responsible for the fine structure that matter exhibits. KEY TAKEAWAYS When we think of fundamental constants, we often think of things like the speed of light, the strength of the force of gravity, or the electric charge of the electron. Those constants, however, are all dimensionful; they depend on the units we choose to measure the Universe. An alternative is to use dimensionless constants: pure numbers, alone, with no units at all. When we do, we run into a completely fascinating one: the fine-structure constant, which represents the strength of the electromagnetic force. Here’s why it, and the number 1/137, matters.

??Scientific paper: Exploring Dark Forces with Multimessenger Studies of Extreme Mass Ratio Inspirals Abstract: The exploration of dark sector interactions via gravitational waves \(GWs\) from binary inspirals has been a subject of recent interest. We study dark forces using extreme mass ratio inspirals \(EMRIs\), pointing out two issues of interest. Firstly, the innermost stable circular orbit \(ISCO\) of the EMRI, which sets the characteristic length scale of the system and hence the dark force range to which it exhibits enhanced sensitivity, probes force mediator masses that complement those studied with supermassive black hole \(SMBH\) or neutron star binaries. The LISA mission \(the proposed $\mu$Ares detector\) will probe mediators with masses $m\_V \sim 10^\{-16\}\~\{\rm eV\}$ \($m\_V \sim 10^\{-18\}\~\{\rm eV\}$\), corresponding to ISCOs of $10^6 M\_\odot$ \($10^8 M\_\odot$\) central SMBHs. Secondly, while the sensitivity to dark couplings is typically limited by the uncertainty in the binary component masses, independent mass measurements of the central SMBH through reverberation mapping campaigns or the motion of dynamical tracers enable one to break this degeneracy. Our results, therefore, highlight the necessity for coordinated studies, loosely referred to as "multimessenger", between future $\mu\{\rm Hz\}-\{\rm mHz\}$ GW observatories and ongoing and forthcoming SMBH mass measurement campaigns, including OzDES-RM, SDSS-RM, and SDSS-V Black Hole Mapper. ;Comment: 16+6 pages, 6 figures Continued on ES/IODE ?? https://etcse.fr/59xci ------- If you find this interesting, feel free to follow, comment and share. We need your help to enhance our visibility, so that our platform continues to serve you.

??Scientific paper: Measuring the Lense-Thirring precession and the neutron star moment of inertia with pulsars Abstract: Neutron stars (NSs) are compact objects that host the densest forms of matter in the observable universe, providing unique opportunities to study the behaviour of matter at extreme densities. While precision measurements of NS masses through pulsar timing have imposed effective constraints on the equation of state (EoS) of dense matter, accurately determining the radius or moment of inertia (MoI) of a NS remains a major challenge. This article presents a detailed review on measuring the Lense-Thirring (LT) precession effect in the orbit of binary pulsars, which would give access to the MoI of NSs and offer further constraints on the EoS. We discuss the suitability of certain classes of binary pulsars for measuring the LT precession from the perspective of binary star evolution, and highlight five pulsars that exhibit properties promising to realise these goals in the near future. Finally, discoveries of compact binaries with shorter orbital periods hold the potential to greatly enhance measurements of the MoI of NSs. The MoI measurements of binary pulsars are pivotal to advancing our understanding of matter at supranuclear densities as well as improving the precision of gravity tests, such as the orbital decay due to gravitational wave emission and of tests of alternative gravity theories. ;Comment: Invited review for special issue of Universe on "Studies in Neutron Stars" (accepted); 24 pages, 9 figures and 1 table Continued on ES/IODE ?? https://etcse.fr/ye6BW ------- If you find this interesting, feel free to follow, comment and share. We need your help to enhance our visibility, so that our platform continues to serve you.

The Quantum Critical Universe Hypothesis proposes that diverse universes in the multiverse - from subcritical to supercritical - emerge from quantum fluctuations at the universe's origin. Critical and near-critical universes, balanced between order and chaos, possess self-organising properties that make them resilient and capable of supporting complex structures and life. At criticality, these universes also achieve a maximum capacity for both Gibbs free energy and Friston's free energy, enabling optimal thermodynamic energy use and information processing. Evidence from scale invariance, fractal structures, universal physical laws, and CMB data supports the notion that our universe may be in a critical or near-critical state, potentially part of a multiverse.