Stellar-mass black holes yog cov khoom saum ntuj ceeb tsheej uas yug los ntawm kev tawg ntawm cov hnub qub nrog ntau ntawm ob peb mus rau ntau pua zaus ntawm peb lub hnub. Lawv qhov gravitational yog khaus heev uas tsis muaj teeb meem lossis hluav taws xob tuaj yeem khiav tawm lawv, ua rau lawv nrhiav tau nyuaj heev.
Yog li ntawd, thaum lub me me ripples nyob rau hauv qhov chaw-lub sij hawm tsim los ntawm kev sib koom ua ke ntawm ob lub qhov dub tau kuaj pom nyob rau hauv 2015 los ntawm Laser Interferometer Gravitational-wave Observatory (LIGO), nws tau qhuas raws li lub caij ntuj sov.
Raws li astrophysicists, ob qhov sib koom ua ke dub qhov ntawm lub hauv paus chiv keeb ntawm lub teeb liab yog kwv yees li 30 npaug ntawm lub hnub thiab nyob 1.5 billion lub teeb-xyoos deb.
LIGO detector beam tube - illustrative photo. Duab credit: Jeff Keyzer ntawm Flickr, CC BY-SA 2.0
Bridging theory thiab kev soj ntsuam
Dab tsi mechanisms tsim cov qhov dub? Lawv puas yog cov khoom lag luam ntawm kev hloov pauv ntawm ob lub hnub qub, zoo ib yam li peb lub hnub tab sis loj dua, hloov zuj zus nyob rau hauv binary system? Los yog lawv puas tshwm sim los ntawm qhov dub hauv cov hnub qub uas muaj neeg coob coob khiav mus rau ib leeg los ntawm lub sijhawm? Los yog tej zaum yuav muaj kev sib txawv ntau dua li kev koom tes? Tag nrho cov lus nug no tseem muaj kev sib cav txog niaj hnub no.
POSYDON kev koom tes, pab pawg kws tshawb fawb los ntawm cov tsev kawm suav nrog Northwestern, University of Geneva (UNIGE) thiab University of Florida (UF), tau ua qhov tseem ceeb hauv kev simulating binary-hnub qub pej xeem. Txoj haujlwm no yog pab muab cov lus teb kom raug ntau dua thiab rov ua dua qhov kev kwv yees theoretical nrog cov ntaub ntawv soj ntsuam.
Simone Bavera, tus kws tshawb fawb tom qab kawm tiav hauv chav haujlwm astronomy ntawm UNIGE's Kws qhia ntawv ntawm Kev Tshawb Fawb tau hais tias "Raws li nws tsis tuaj yeem soj ntsuam ncaj qha rau kev tsim cov binary dub qhov sib koom ua ke, nws yog qhov yuav tsum tau tso siab rau kev sim tus sau txoj kev kawm.
"Peb ua qhov no los ntawm simulating lub binary-hnub qub systems los ntawm lawv yug los rau tsim lub binary black qhov systems."
Ib tus kws kos duab lub tswv yim qhia pom ob qhov sib koom ua ke dub zoo ib yam li cov uas tau pom los ntawm LIGO. Credit: Aurore Simonnet/LIGO-Caltech-MIT-Sonoma State
Thawb cov kev txwv ntawm simulation
Kev txhais cov hauv paus ntsiab lus ntawm kev sib koom ua ke binary dub qhov, xws li ib qho kev pom nyob rau hauv 2015, yuav tsum tau muab piv cov qauv kev kwv yees nrog cov kev soj ntsuam tiag tiag. Cov txheej txheem siv los ua cov qauv no yog hu ua "binary pejxeem synthesis."
"Cov txheej txheem no simulates lub evolution ntawm kaum tawm lab ntawm binary lub hnub qub systems nyob rau hauv thiaj li yuav kwv yees cov txheeb cais cov khoom ntawm qhov tshwm sim gravitational-yoj qhov chaw pej xeem," said Anastasios Fragkos, tus pab xib fwb nyob rau hauv lub department ntawm astronomy ntawm lub UNIGE Kws qhia ntawv ntawm Science.
"Txawm li cas los xij, txhawm rau ua tiav qhov no hauv lub sijhawm tsim nyog, cov kws tshawb fawb muaj txog tam sim no tso siab rau cov qauv uas siv cov txheej txheem kwv yees los simulate cov kev hloov pauv ntawm cov hnub qub thiab lawv cov kev sib cuam tshuam binary," nws hais. "Vim li no, kev ua kom yooj yim ntawm ib leeg thiab binary stellar physics ua rau kev kwv yees tsawg dua."
POSYDON tau kov yeej cov kev txwv no. Tsim los ua cov software qhib, nws siv lub tsev qiv ntawv loj ua ntej suav nrog cov ncauj lus kom ntxaws ib leeg- thiab binary-hnub qub simulations los kwv yees qhov kev hloov pauv ntawm kev sib cais binary systems.
Txhua qhov kev sim ua kom ntxaws no yuav siv sijhawm txog 100 qhov chaw ua haujlwm hauv nruab nrab (CPU) cov xuab moos los khiav ntawm lub khoos phis tawj super, ua rau cov txheej txheem simulation no tsis siv ncaj qha rau binary pejxeem synthesis.
"Txawm li cas los xij, los ntawm precomputing lub tsev qiv ntawv ntawm simulations uas npog tag nrho qhov chaw tsis muaj qhov chaw pib, POSYDON tuaj yeem siv cov ntaub ntawv dav dav no nrog rau cov kev kawm tshuab los kwv yees qhov kev hloov pauv ntawm binary systems hauv tsawg dua ib pliag," said Jeffrey Andrews, tus pab cuam. xib fwb hauv department of physics ntawm UF.
"Qhov kev ceev no yog piv rau cov txheej txheem kev sib txuas ceev ntawm cov pej xeem yav dhau los, tab sis nrog kev txhim kho qhov tseeb."
Qhia tus qauv tshiab
POSYDON, ib qhov kev loj hlob code project, stands rau POpulation SYnqes nrog Detailed binary-evolution simulatiONs. Kalogera thiab Tassos Fragos, yav tas los Ph.D. cov tub ntxhais kawm hauv Kalogera pawg, yog tus thawj coj tshawb fawb ntawm txoj haujlwm, uas tau pib ntawm Northwestern xyoo 2019 nrog kev txhawb nqa los ntawm Gordon thiab Betty Moore Foundation thiab Swiss National Science Foundation.
Fragos, tam sim no nrog University of Geneva, yog tus kws sau ntawv ntawm txoj kev tshawb no. Lub Tsev Kawm Ntawv Qib Siab Florida tau koom nrog kev sib koom tes xyoo no.
Cov qauv yav dhau los overestimated qee yam, xws li kev nthuav dav ntawm cov hnub qub loj, uas cuam tshuam rau lawv qhov poob thiab kev sib cuam tshuam binary. Cov ntsiab lus no yog cov khoom xyaw tseem ceeb uas txiav txim siab lub zog ntawm kev sib koom ua ke ntawm qhov dub.
Ua tsaug rau nws tus kheej ua raws li cov ncauj lus kom ntxaws stellar-structure thiab binary-kev sib tham simulations, POSYDON ua tiav qhov kev kwv yees ntau dua ntawm kev sib koom ua ke binary dub qhov khoom xws li lawv cov pawg thiab cov kev sib tw.
Pab pawg tshawb fawb tam sim no tab tom tsim kho tshiab ntawm POSYDON, uas yuav suav nrog lub tsev qiv ntawv loj dua ntawm cov ncauj lus kom ntxaws stellar thiab binary simulations, muaj peev xwm simulating binaries hauv ntau hom galaxy.
Tau qhov twg los: Northwestern University
