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	Author	Siahmazgi, S.G.; Anderson, P.R.; Fabbri, A.
	Title	Late-time behavior of scalar field modes for a collapsing null shell spacetime and for the Unruh state in Schwarzschild spacetime			Type	Journal Article
	Year	2025	Publication	Physical Review D	Abbreviated Journal	Phys. Rev. D
	Volume	112	Issue	4	Pages	045013 - 8pp
	Keywords
	Abstract	The behaviors of the spherically symmetric modes for a massless minimally coupled scalar field are investigated for the Unruh state for Schwarzschild spacetime and the in vacuum state for a spacetime in which a null shell collapses to form a Schwarzschild black hole. In both cases, there are two different sets of solutions to the mode equation that make up the state. For both spacetimes, one set of modes oscillates forever with no damping of the oscillations and the other set approaches zero at late times. The difference between a mode that oscillates forever in the null-shell spacetime and the corresponding mode for the Unruh state at late times vanishes as a power law in time. The modes that approach zero at late times also vanish as a power law in time. In all cases, the power-law damping is preceded by a period of oscillations that appear to be due to quasinormal modes.
	Address	[Siahmazgi, Shohreh Gholizadeh] Wake Forest Univ, Dept Math, Winston Salem, NC 27109 USA; [Siahmazgi, Shohreh Gholizadeh; Anderson, Paul R.] Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA; [Fabbri, Alessandro] Univ Valencia, Dept Fis Teor, CSIC, C Dr Moliner 50, Burjassot 46100, Spain; [Fabbri, Alessandro] Univ Valencia, IFIC, CSIC, C Dr Moliner 50, Burjassot 46100, Spain, Email: afabbri@ific.uv.es;
	Corporate Author				Thesis
	Publisher	Amer Physical Soc	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	2470-0010	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001565749400002			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6823
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