Kimiyyar lissafi
Ka'ida ta farko ita ce kada ka yaudari kanka, kuma kai ne wanda zaka iya yaudarar kanka cikin sauki.
— (1974)
Five-dimensional classical model yana ƙoƙarin sake gina quantum behaviour ba tare da quantizing gravity ba
Wata takarda a Scientific Reports ta gabatar da tsarin 4D + tau inda ordinary spacetime yake evolve ƙarƙashin wani ƙarin parameter. A simulations da model calculations, tsarin yana dawo da Newtonian gravity a equilibrium, yana nufin samun basic general-relativistic structure, kuma yana sake samar da EPR-type correlations da double-slit-like interference ta worldline dynamics. Wannan theoretical construction ne mai jan hankali, ba experimental proof cewa an warware quantum gravity ko cewa standard quantum mechanics kuskure ne ba.
A orbit, gishirin tebur ya girma ya zama cubes masu rami. Gravity ta canza brine, ba gishirin ba
Crystals na sodium chloride da aka girma a International Space Station sun haɗa da cubes masu rami da matakai masu faɗin 2 zuwa 8 millimetres. Takardun suna goyon bayan bayanin transport: nutsewar yau da kullum da buoyancy-driven flow sun ragu sosai, yayin da diffusion ya fi rinjaye a farkon girma. Lattice ɗin bai zama sabon nau’in gishiri ba, kuma gwaje-gwajen ba su kafa tsarin masana’antu ba.
Gwajin cold atoms yana gwada “problem of time” na quantum gravity — a matsayin laboratory analog, ba amsa ba
A canonical quantum gravity, Wheeler-DeWitt equation ba ta da external clock da zai jera events: “problem of time”. Wani experiment mai author guda ya isolate Bose-Einstein condensate, ya split shi da thin optical barrier zuwa unobserved da observed sector, sannan ya gina internal clock daga entropy da ke flow tsakanin su. Wannan “entropic time” yana order expansion da recollapse na observed sector, kuma effective equation tana reproduce measured data a low-barrier case da aka examine. Controlled testbed ne ga relational-time ideas: “big bang”, “big crunch” da “miniuniverse” analog labels ne ga trapped gas, ba real cosmology ba, kuma aikin ba ya claim ya solve problem of time ko quantum gravity.
Black holes suna bin thermodynamic “laws” — sabon sakamako ya faɗaɗa su zuwa black holes da suke nesa sosai da equilibrium
Tun farkon shekarun 1970 an san cewa black holes suna bin dokoki masu kama da thermodynamics, amma mafi tsabtar sigar waɗannan dokokin ta shafi black holes da suke cikin equilibrium ne kawai. Wata sabuwar takarda a Physical Review Letters ta faɗaɗa first da second laws zuwa black holes da suke canzawa da sauri — suna haɗiye matter, suna merger ko suna radiating — ta amfani da locally defined ‘dynamical horizons’. Wannan yana ba physicists damar bayyana temperature da entropy ko ga black hole da ke violently evolving. Mathematical result ne a classical general relativity, ba sabon quantum gravity ba, ba observation ba, kuma ba mafita ga black-hole information puzzle ba.
A cikin entropy-based gravity model, local entropy density yana raguwa yayin da total ke ƙaruwa
Wata takarda a Physical Review D ta samo temperatures, pressures da first law a cikin Gravity From Entropy, wani proposed modified-gravity framework. A late-time, low-curvature Friedmann approximation, local entropy da energy densities na model suna raguwa yayin da expansion ke sa total entropy ya ƙaru. Lissafin yana da cikakken ma'ana a cikin framework ɗin, amma yana da sharaɗi: Friedmann cosmologies ba exact solutions na full theory ba ne, kuma wannan ba observational evidence cewa gravity ta fito daga entropy ba, ba explanation na measured dark energy ba, kuma ba completed quantum-gravity theory ba.
Na'urar fusion ta dumama plasma ta hanyar matse shi — wannan ne ainihin matakin, ba tashar wutar lantarki ba
LM26 ta General Fusion ta matse magnetized deuterium plasma da lithium liner da ke imploding, ta kuma ga electron temperature ya fi ninki uku zuwa peak kusan 0.72 keV (718 ± 80 eV, kusan miliyan 8 °C), yayin da analysis na kamfanin ya danganta mafi yawan dumamar da compression kanta. Wannan checkpoint ne na engineering ga magnetized target fusion, amma shots 11 na farko ne, a company preprint da ba a yi peer review ba, a zafin da har yanzu ya yi kusan sau goma ƙasa da burning plasma — babu net energy, breakeven ko wutar lantarki.
Quantum mechanics za a iya rubuta ta da real numbers kawai — amma caveat yana cikin yadda ake combine systems
A 2021 wani widely reported result ya nuna real-number quantum mechanics da standard tensor-product rule za a iya falsify experimentally, kuma 2022 experiments sun agree da complex quantum theory. Wannan ya zama headline cewa imaginary numbers physically real ne. Sabuwar Physical Review Letters paper ta sharpen claim: idan real formulation aka gina a different locality-based assumption game da combining systems, tana reproduce every prediction na complex theory, ciki har da multipartite tests. Honest reading: complex numbers convenient ne, ba strictly necessary ba; earlier experiments sun rule out particular real theory, ba real numbers in principle ba.
Quantum memory ta ƙarshe ta fara inganta yayin da ta girma — wannan ne milestone, ba working computer ba
Google Quantum AI ta nuna da tsafta a karon farko cewa surface-code quantum memory na iya aiki below threshold: yayin code ya girma daga distance 3 zuwa 5 zuwa 7, logical error rate ta ragu exponentially (kus. 2.14× ga kowane steps biyu), kuma 101-qubit distance-7 memory ta rayu fiye da best physical qubit — beyond breakeven — tare da real-time error correction. Milestone ne da aka daɗe ana nema, amma logical memory qubit ɗaya ce, error rate har yanzu nesa da algorithms na gaske, babu logical gates, akwai unexplained error floor, kuma scaling mai yawa yana gaba.
Muon-catalysed fusion: hidden reaction step, a ƙarshe an gan shi kai tsaye — ba step toward fusion energy ba
Ta amfani da exceptionally sharp quantum-sensor X-ray detector, physicists sun tura muons cikin frozen deuterium kuma, a karo na farko, suka directly observe muonic molecules a fleeting “resonance” states — suna nuna cewa kusan rabin muons suna bi pathway da standard description na muon-catalysed fusion ya bari. Ya confirm long-proposed formation mechanism kuma yana buƙatar revision na models na fannin. Real advance ne a ganin da fahimtar reaction — ba step toward fusion as an energy source ba: ba ya improve efficiency, ba ya touch muon-loss (“alpha sticking”) bottleneck, kuma an yi shi a deuterium, ba energy-relevant deuterium–tritium mix ba.