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- W3042740941 abstract "We study the stability of relativistic stars in scalar-tensor theories with a nonminimal coupling of the form $F(ensuremath{phi})R$, where $F$ depends on a scalar field $ensuremath{phi}$ and $R$ is the Ricci scalar. On a spherically symmetric and static background, we incorporate a perfect fluid minimally coupled to gravity as a form of the Schutz-Sorkin action. The odd-parity perturbation for the multipoles $lensuremath{ge}2$ is ghost-free under the condition $F(ensuremath{phi})>0$, with the speed of gravity equivalent to that of light. For even-parity perturbations with $lensuremath{ge}2$, there are three propagating degrees of freedom arising from the perfect-fluid, scalar-field, and gravity sectors. For $l=0$, 1, the dynamical degrees of freedom reduce to two modes. We derive no-ghost conditions and the propagation speeds of these perturbations and apply them to concrete theories of hairy relativistic stars with $F(ensuremath{phi})>0$. As long as the perfect fluid satisfies a weak energy condition with a positive propagation speed squared ${c}_{m}^{2}$, there are neither ghost nor Laplacian instabilities for theories of spontaneous scalarization and Brans-Dicke (BD) theories with a BD parameter ${ensuremath{omega}}_{mathrm{BD}}>ensuremath{-}3/2$ (including $f(R)$ gravity). In these theories, provided $0<{c}_{m}^{2}ensuremath{le}1$, we show that all the propagation speeds of even-parity perturbations are subluminal inside the star, while the speeds of gravity outside the star are equivalent to that of light." @default.
- W3042740941 created "2020-07-23" @default.
- W3042740941 creator A5013481498 @default.
- W3042740941 creator A5081326410 @default.
- W3042740941 creator A5085979084 @default.
- W3042740941 creator A5090048678 @default.
- W3042740941 date "2020-10-15" @default.
- W3042740941 modified "2023-10-13" @default.
- W3042740941 title "Stability of relativistic stars with scalar hairs" @default.
- W3042740941 cites W1795685300 @default.
- W3042740941 cites W1825257214 @default.
- W3042740941 cites W1867998226 @default.
- W3042740941 cites W1928418389 @default.
- W3042740941 cites W1964763050 @default.
- W3042740941 cites W1965197768 @default.
- W3042740941 cites W1965530791 @default.
- W3042740941 cites W1971230011 @default.
- W3042740941 cites W1981437720 @default.
- W3042740941 cites W1982005426 @default.
- W3042740941 cites W1984688552 @default.
- W3042740941 cites W1988281968 @default.
- W3042740941 cites W1989972931 @default.
- W3042740941 cites W1994002049 @default.
- W3042740941 cites W1995777558 @default.
- W3042740941 cites W1998088071 @default.
- W3042740941 cites W1998871856 @default.
- W3042740941 cites W1999658221 @default.
- W3042740941 cites W2000112247 @default.
- W3042740941 cites W2007663042 @default.
- W3042740941 cites W2009684584 @default.
- W3042740941 cites W2009745571 @default.
- W3042740941 cites W2015947787 @default.
- W3042740941 cites W2018309493 @default.
- W3042740941 cites W2027999606 @default.
- W3042740941 cites W2032949900 @default.
- W3042740941 cites W2041664594 @default.
- W3042740941 cites W2041876997 @default.
- W3042740941 cites W2042961424 @default.
- W3042740941 cites W2044228803 @default.
- W3042740941 cites W2045137892 @default.
- W3042740941 cites W2054708802 @default.
- W3042740941 cites W2062912482 @default.
- W3042740941 cites W2064395219 @default.
- W3042740941 cites W2071923662 @default.
- W3042740941 cites W2072238606 @default.
- W3042740941 cites W2077161413 @default.
- W3042740941 cites W2080310149 @default.
- W3042740941 cites W2106127715 @default.
- W3042740941 cites W2107048978 @default.
- W3042740941 cites W2115120324 @default.
- W3042740941 cites W2116630626 @default.
- W3042740941 cites W2116923776 @default.
- W3042740941 cites W2118143002 @default.
- W3042740941 cites W2126667778 @default.
- W3042740941 cites W2141723292 @default.
- W3042740941 cites W2141978587 @default.
- W3042740941 cites W2142078650 @default.
- W3042740941 cites W2149354980 @default.
- W3042740941 cites W2152747485 @default.
- W3042740941 cites W2154678216 @default.
- W3042740941 cites W2163471984 @default.
- W3042740941 cites W2171715708 @default.
- W3042740941 cites W2231773349 @default.
- W3042740941 cites W2236745909 @default.
- W3042740941 cites W2245706544 @default.
- W3042740941 cites W2252795400 @default.
- W3042740941 cites W2259378207 @default.
- W3042740941 cites W2342487210 @default.
- W3042740941 cites W2398470767 @default.
- W3042740941 cites W2402806345 @default.
- W3042740941 cites W2462226198 @default.
- W3042740941 cites W2728107634 @default.
- W3042740941 cites W2735308771 @default.
- W3042740941 cites W2765081049 @default.
- W3042740941 cites W2767486812 @default.
- W3042740941 cites W2767864485 @default.
- W3042740941 cites W2768700740 @default.
- W3042740941 cites W2774726642 @default.
- W3042740941 cites W2783287063 @default.
- W3042740941 cites W2789529951 @default.
- W3042740941 cites W2794432100 @default.
- W3042740941 cites W2808206984 @default.
- W3042740941 cites W2904918740 @default.
- W3042740941 cites W2941068214 @default.
- W3042740941 cites W2950149046 @default.
- W3042740941 cites W2951226707 @default.
- W3042740941 cites W2964048743 @default.
- W3042740941 cites W2965243161 @default.
- W3042740941 cites W2969435005 @default.
- W3042740941 cites W2985987205 @default.
- W3042740941 cites W3004070810 @default.
- W3042740941 cites W3013703845 @default.
- W3042740941 cites W3015189865 @default.
- W3042740941 cites W3021937719 @default.
- W3042740941 cites W3098503679 @default.
- W3042740941 cites W3098541099 @default.
- W3042740941 cites W3099980256 @default.
- W3042740941 cites W3100079069 @default.
- W3042740941 cites W3100339959 @default.
- W3042740941 cites W3102676254 @default.