Fate of observers in circular motion
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Fate of observers in circular motion. / Lehebel, Antoine; Cardoso, Vitor.
I: Physical Review D, Bind 105, Nr. 6, 064014, 08.03.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Fate of observers in circular motion
AU - Lehebel, Antoine
AU - Cardoso, Vitor
PY - 2022/3/8
Y1 - 2022/3/8
N2 - In Newtonian physics or in general relativity, energy dissipation causes observers moving along circular orbits to slowly spiral toward the source of the gravitational field. We show that the loss of energy has the same effect in any theory of gravity respecting the weak equivalence principle, by exhibiting an intimate relation between the energy of a massive test particle and the stability of its orbit. Ultimately, massive particles either plunge, or are driven towards minima of the generalized Newtonian potential, where they become static. In addition, we construct a toy metric which displays an unbound innermost stable circular orbit, allowing particles that reach this orbit to be expelled away.
AB - In Newtonian physics or in general relativity, energy dissipation causes observers moving along circular orbits to slowly spiral toward the source of the gravitational field. We show that the loss of energy has the same effect in any theory of gravity respecting the weak equivalence principle, by exhibiting an intimate relation between the energy of a massive test particle and the stability of its orbit. Ultimately, massive particles either plunge, or are driven towards minima of the generalized Newtonian potential, where they become static. In addition, we construct a toy metric which displays an unbound innermost stable circular orbit, allowing particles that reach this orbit to be expelled away.
KW - FIELD
U2 - 10.1103/PhysRevD.105.064014
DO - 10.1103/PhysRevD.105.064014
M3 - Journal article
VL - 105
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 6
M1 - 064014
ER -
ID: 302382472