Testing gravity with interstellar precursor missions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10406395" target="_blank" >RIV/00216208:11320/19:10406395 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stz1508" target="_blank" >10.1093/mnras/stz1508</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Testing gravity with interstellar precursor missions

Popis výsledku v původním jazyce

We consider how the trajectory of an interstellar precursor mission would be affected by the gravity of the Sun in Newtonian and Milgromian dynamics (MOND). The solar gravity is approximate to 50 per cent stronger in MOND beyond a distance of approximate to 7000 astronomical units, the Sun&apos;s MOND radius. A spacecraft travelling at 0.01 of light speed reaches this distance after 11.1 years. We show that the extra gravity in MOND causes an anomalous deceleration that reduces its radial velocity by approximate to 3 cms(-1) and the two-way light travel time from the inner Solar System by approximate to 0.1 s after 20 years. A distinctive signature of MOND is that the gravity from the Sun is not directly towards it. This is due to the nonlinear nature of MOND and the external gravitational field from the rest of the Galaxy, which we self-consistently include in our calculations. As a result, the sky position of the spacecraft would deviate by up to 0.2 mas over 20 years. This deviation is always in the plane containing the spacecraft trajectory and the direction towards the Galactic centre. By launching spacecraft in different directions, it is possible to test the characteristic pattern of angular deviations expected in MOND. This would minimize the chance that any detected anomalies are caused by other processes like drag from the interstellar medium. Such confounding factors could also be mitigated using an onboard accelerometer to measure non-gravitational forces. We briefly discuss how the gravity theories could be conclusively distinguished using a Cavendish-style active gravitational experiment beyond the Sun&apos;s MOND radius.

Název v anglickém jazyce

Testing gravity with interstellar precursor missions

Popis výsledku anglicky

We consider how the trajectory of an interstellar precursor mission would be affected by the gravity of the Sun in Newtonian and Milgromian dynamics (MOND). The solar gravity is approximate to 50 per cent stronger in MOND beyond a distance of approximate to 7000 astronomical units, the Sun&apos;s MOND radius. A spacecraft travelling at 0.01 of light speed reaches this distance after 11.1 years. We show that the extra gravity in MOND causes an anomalous deceleration that reduces its radial velocity by approximate to 3 cms(-1) and the two-way light travel time from the inner Solar System by approximate to 0.1 s after 20 years. A distinctive signature of MOND is that the gravity from the Sun is not directly towards it. This is due to the nonlinear nature of MOND and the external gravitational field from the rest of the Galaxy, which we self-consistently include in our calculations. As a result, the sky position of the spacecraft would deviate by up to 0.2 mas over 20 years. This deviation is always in the plane containing the spacecraft trajectory and the direction towards the Galactic centre. By launching spacecraft in different directions, it is possible to test the characteristic pattern of angular deviations expected in MOND. This would minimize the chance that any detected anomalies are caused by other processes like drag from the interstellar medium. Such confounding factors could also be mitigated using an onboard accelerometer to measure non-gravitational forces. We briefly discuss how the gravity theories could be conclusively distinguished using a Cavendish-style active gravitational experiment beyond the Sun&apos;s MOND radius.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

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

487

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

2665-2672

Kód UT WoS článku

000474919700082

EID výsledku v databázi Scopus

2-s2.0-85071188257