Físíksì
Òfin àkọ́kọ́ ni pé o kò gbọ́dọ̀ tan ara rẹ jẹ́—ìwọ sì ni ẹni tí ó rọrùn jù lọ láti tàn jẹ.
— (1974)
Model classical dimension márùn-ún kan ń gbìyànjú láti tún quantum behavior kọ láì quantize gravity
Paper Scientific Reports kan dabaa framework 4D + tau níbi tí ordinary spacetime ń evolve lábẹ́ parameter afikun. Nínú simulation àti model calculation, ó recover Newtonian gravity ní equilibrium, ó ń lépa basic general-relativistic structure, ó sì tún EPR-type correlation àti double-slit-like interference ṣe nípasẹ̀ worldline dynamics. Abajade náà jẹ́ theoretical construction tó ń fa ìjiyàn, kì í ṣe experimental proof pé quantum gravity ti yanju tàbí pé standard quantum mechanics jẹ́ aṣìṣe.
Ní òkè òfurufú, iyọ̀ tábìlì dàgbà sí cube tí inú rẹ̀ ṣófo. Gravity yí brine padà, kì í ṣe iyọ̀ náà
Àwọn crystal sodium chloride tí wọ́n dàgbà lórí International Space Station ní àwọn cube ṣófo tí ó ní ìpele, 2 sí 8 millimita ní ìwọ̀n. Àwọn paper náà ṣe atilẹyin fún transport explanation: ordinary settling àti buoyancy-driven flow dín kù gan-an, nígbà tí diffusion jẹ́ olórí ní ìbẹ̀rẹ̀ ìdàgbàsókè. Lattice náà kò di irú iyọ̀ tuntun, àwọn ìdánwò náà kò sì fìdí industrial process kan múlẹ̀.
Cold-atom experiment kan test ‘problem of time’ quantum gravity — gẹ́gẹ́ bí laboratory analog, kì í ṣe answer
Nínú canonical quantum gravity, Wheeler-DeWitt equation kò ní external clock láti sequence event: ‘problem of time’. Single-author experiment kan isolate Bose-Einstein condensate, pin rẹ̀ pẹ̀lú thin optical barrier sí unobserved àti observed sector, ó sì build internal clock láti entropy tí ń flow láàárín wọn. ‘Entropic time’ yẹn order expansion àti recollapse observed sector, effective equation sì reproduce measured data nínú low-barrier case examined. Ó jẹ́ controlled testbed fún relational-time idea: ‘big bang’, ‘big crunch’ àti ‘miniuniverse’ jẹ́ analog label fún trapped gas, kì í ṣe real cosmology, iṣẹ́ náà kò sì claim láti solve problem of time tàbí quantum gravity.
Black hole ń tẹ̀lé ‘òfin’ thermodynamics — abajade tuntun fa wọn dé black hole tó ń yí padà gidigidi níta equilibrium
Láti àwọn ọdún 1970 ni a ti mọ̀ pé black hole ń tẹ̀lé òfin tó dà bí thermodynamics, ṣùgbọ́n ẹ̀yà tó mọ́ jù ṣiṣẹ́ fún black hole tó jókòó ní ìdákẹ́jẹ́ nínú equilibrium nìkan. Paper tuntun nínú Physical Review Letters fa first àti second law dé black hole tó ń yí padà kíákíá — tó ń jẹ matter, tó ń merge, tó ń radiate — nípa lílo ‘dynamical horizon’ tí a ṣàlàyé ní local. Ó jẹ́ kí physicist lè fún black hole tó ń evolve pẹ̀lú ìwa-ipa ní temperature àti entropy. Èyí jẹ́ abajade mathematics nínú classical general relativity, kì í ṣe quantum gravity tuntun, kì í ṣe observation, kò sì yanju black-hole information puzzle.
Nínú model gravity tó dá lórí entropy, local entropy density ń dín kù nígbà tí total ń pọ̀ sí i
Paper Physical Review D kan derive temperature, pressure àti first law nínú Gravity From Entropy, proposed modified-gravity framework. Nínú late-time, low-curvature Friedmann approximation, local entropy àti energy density model ń dín kù nígbà tí expansion ń mú total entropy pọ̀ sí i. Calculation náà concrete nínú theory, ṣùgbọ́n conditional: Friedmann cosmology kì í ṣe exact solution ti full theory, èyí kì í sì ṣe observational evidence pé gravity wá láti entropy, explanation ti measured dark energy, tàbí completed quantum-gravity theory.
Ẹ̀rọ fusion kan gbóná plasma rẹ̀ nípa fífi ipa tẹ̀ ẹ́ — ìgbésẹ̀ gidi náà, àti power plant tí kò tíì jẹ́
LM26 ti General Fusion compress magnetized deuterium plasma pẹ̀lú imploding lithium liner, electron temperature rẹ̀ sì ga ju igba mẹ́ta lọ sí peak tó wọn sí 0.72 keV (718 ± 80 eV, bíi 8 million °C). Analysis ilé-iṣẹ́ náà sọ pé ọ̀pọ̀ jù lọ heating wá láti compression funra rẹ̀, mechanism tí magnetized-target fusion gbára lé. Èyí jẹ́ engineering checkpoint gidi, ṣùgbọ́n ó jẹ́ shots 11 àkọ́kọ́, nínú company preprint tí kò tíì peer-reviewed, ní temperature tó ṣì tó ìgbà mẹ́wàá kéré ju burning plasma nílò — láìsí net energy, breakeven tàbí electricity. Mechanism kan ti hàn; power plant kò tíì wà.
A lè kọ quantum mechanics pẹ̀lú real numbers nìkan — catch náà wà nínú bí systems ṣe combine
Result 2021 kan àti experiments 2022 favor standard complex quantum theory over real-number version kan tí ó pa tensor-product rule mọ́, ohun tí headlines yí sí “imaginary numbers are physically real.” Paper tuntun nínú Physical Review Letters kọ real-number formulation lórí different locality-based assumption, ó sì reproduce every prediction of complex quantum mechanics, pẹ̀lú multipartite tests. Honest reading ni pé complex numbers convenient, kì í ṣe strictly necessary; earlier experiments rule out one particular real theory, kì í ṣe real numbers in principle.
Quantum memory kan nikẹhin dára síi bí ó ṣe ń tóbi — milestone gidi náà, àti machine tí kò tíì jẹ́
Google Quantum AI fi hàn ní kedere fún igba àkọ́kọ́ pé surface-code quantum memory lè run below threshold: bí code ṣe lọ láti distance 3 sí 5 sí 7, logical error rate dín exponentially, largest 101-qubit distance-7 memory sì pẹ́ ju best physical qubit rẹ̀ lọ — beyond breakeven — pẹ̀lú real-time error correction. Milestone engineering gidi ni. Ṣùgbọ́n logical qubit kan ni tó ń ṣiṣẹ́ bí memory, error rate rẹ̀ ṣì jìn sí ohun tí real algorithms nílò, kò sí logical gates, unexplained error floor sì wà.
Muon-catalysed fusion: hidden reaction step kan, tí a rí taara níkẹyìn — kì í ṣe step sí fusion energy
Pẹ̀lú exceptionally sharp quantum-sensor X-ray detector, physicists firing muons sínú frozen deuterium, wọ́n sì fún first time directly observe muonic molecules nínú fleeting ‘resonance’ states — tí ó fi hàn pé tó half muons gba pathway tí standard description ti muon-catalysed fusion fi sílẹ̀. Ó confirm long-proposed formation mechanism, ó sì force revision ti field models. Èyí jẹ́ real advance nínú seeing àti understanding reaction — kì í ṣe step toward fusion as energy source: kò improve efficiency, kò touch muon-loss (‘alpha sticking’) bottleneck, a sì ṣe e nínú deuterium, kì í ṣe energy-relevant deuterium–tritium mix.