Solar System limits on gravitational dipoles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423395" target="_blank" >RIV/00216208:11320/20:10423395 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=aEet460j8J" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=aEet460j8J</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staa1447" target="_blank" >10.1093/mnras/staa1447</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Solar System limits on gravitational dipoles

Popis výsledku v původním jazyce

The gravitational dipole theory of I Iadjukovic (2010) is based on the hypothesis that antimatter has a negative gravitational mass and thus falls upwards on the Earth. Astrophysically, the model is similar to but more fundamental than Modified Newtonian Dynamics (MOND), with the Newtonian gravity g(N) towards an isolated point mass boosted by the factor nu = 1 + (alpha/x) tanh (root x/alpha), where x (math) g(N)/a(0) and a(0) = 1.2 x 10(-10) m s(-2) is the MOND acceleration constant. We show that alpha must lie in the range 0.4-1 to acceptably fit galaxy rotation curves. In the Solar System, this interpolating function implies an extra Sunwards acceleration of alpha a(0). This would cause Saturn to deviate from Newtonian expectations by 7000(alpha/0.4) km over 15 yr, starting from known initial position and velocity on a near-circular orbit. We demonstrate that this prediction should not be significantly altered by the postulated dipole haloes of other planets due to the rather small region in which each planet&apos;s gravity dominates over that of the Sun. The orbit of Saturn should similarly be little affected by a possible ninth planet in the outer Solar System and by the Galactic gravity causing a non-spherical distribution of gravitational dipoles several kAU from the Sun. Radio tracking of the Cassini spacecraft orbiting Saturn yields a 5 sigma upper limit of 160 m on deviations from its conventionally calculated trajectory. These measurements imply a much more stringent upper limit on alpha than the minimum required for consistency with rotation curve data. Therefore, no value of alpha can simultaneously match all available constraints, falsifying the gravitational dipole theory in its current form at extremely high significance.

Název v anglickém jazyce

Solar System limits on gravitational dipoles

Popis výsledku anglicky

The gravitational dipole theory of I Iadjukovic (2010) is based on the hypothesis that antimatter has a negative gravitational mass and thus falls upwards on the Earth. Astrophysically, the model is similar to but more fundamental than Modified Newtonian Dynamics (MOND), with the Newtonian gravity g(N) towards an isolated point mass boosted by the factor nu = 1 + (alpha/x) tanh (root x/alpha), where x (math) g(N)/a(0) and a(0) = 1.2 x 10(-10) m s(-2) is the MOND acceleration constant. We show that alpha must lie in the range 0.4-1 to acceptably fit galaxy rotation curves. In the Solar System, this interpolating function implies an extra Sunwards acceleration of alpha a(0). This would cause Saturn to deviate from Newtonian expectations by 7000(alpha/0.4) km over 15 yr, starting from known initial position and velocity on a near-circular orbit. We demonstrate that this prediction should not be significantly altered by the postulated dipole haloes of other planets due to the rather small region in which each planet&apos;s gravity dominates over that of the Sun. The orbit of Saturn should similarly be little affected by a possible ninth planet in the outer Solar System and by the Galactic gravity causing a non-spherical distribution of gravitational dipoles several kAU from the Sun. Radio tracking of the Cassini spacecraft orbiting Saturn yields a 5 sigma upper limit of 160 m on deviations from its conventionally calculated trajectory. These measurements imply a much more stringent upper limit on alpha than the minimum required for consistency with rotation curve data. Therefore, no value of alpha can simultaneously match all available constraints, falsifying the gravitational dipole theory in its current form at extremely high significance.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

495

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

3974-3980

Kód UT WoS článku

000546679500038

EID výsledku v databázi Scopus

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