Solar System limits on gravitational dipoles
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Solar System limits on gravitational dipoles
Original language description
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'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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
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Volume of the periodical
495
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
7
Pages from-to
3974-3980
UT code for WoS article
000546679500038
EID of the result in the Scopus database
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