CaltechAUTHORS
  A Caltech Library Service

Gravitational wave signatures of the absence of an event horizon. II. Extreme mass ratio inspirals in the spacetime of a thin-shell gravastar

Pani, Paolo and Berti, Emanuele and Cardoso, Vitor and Chen, Yanbei and Norte, Richard (2010) Gravitational wave signatures of the absence of an event horizon. II. Extreme mass ratio inspirals in the spacetime of a thin-shell gravastar. Physical Review D, 81 (8). Art. No. 084011 . ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20100526-113735041

[img]
Preview
PDF - Published Version
See Usage Policy.

405Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20100526-113735041

Abstract

We study gravitational wave emission from the quasicircular, extreme mass ratio inspiral of compact objects of mass m_0 into massive objects of mass M ≫ m_0 whose external metric is identical to the Schwarzschild metric, except for the absence of an event horizon. To be specific we consider one of the simplest realizations of such an object: a nonrotating thin-shell gravastar. The power radiated in gravitational waves during the inspiral shows distinctive peaks corresponding to the excitation of the polar oscillation modes of the gravastar. For ultracompact gravastars the frequency of these peaks depends mildly on the gravastar compactness. For masses M ~ 10^6M_⊙ the peaks typically lie within the optimal sensitivity bandwidth of the Laser Interferometer Space Antenna, potentially providing a unique signature of the horizonless nature of the central object. For relatively modest values of the gravastar compactness the radiated power has even more peculiar features, carrying the signature of the microscopic properties of the physical surface replacing the event horizon.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.81.084011 DOIArticle
http://prd.aps.org/abstract/PRD/v81/i8/e084011PublisherArticle
Additional Information:© 2010 The American Physical Society. Received 25 January 2010; published 5 April 2010. P. P. thanks the Department of Physics, University of Rome “La Sapienza” for the kind hospitality. E. B.’s research was supported by NSF Grant No. PHY-0900735. V. C. was supported by a “Ciência 2007” research contract and by Fundação Calouste Gulbenkian. Y. C. was supported by NSF Grant Nos. PHY-0653653 and PHY-0601459, and the David and Barbara Groce Start-up Fund at Caltech. This work was partially supported by FCT-Portugal through Project Nos. PTDC/FIS/64175/2006, PTDC/FIS/098025/2008, PTDC/FIS/098032/2008, PTDC/CTE-AST/098034/2008, and CERN/FP/109290/2009. The authors thankfully acknowledge the computer resources, technical expertise, and assistance provided by the Barcelona Supercomputing Centre—Centro Nacional de Supercomputación.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NSFPHY-0900735
NSFPHY-0653653
NSFPHY-0601459
Fundação Calouste Gulbenkian UNSPECIFIED
David and Barbara Groce Startup Fund, CaltechUNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)TDC/FIS/64175/ 2006
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS/098025/2008
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS/098032/2008
Fundação para a Ciência e a Tecnologia (FCT)PTDC/CTE-AST/098034/2008
Fundação para a Ciência e a Tecnologia (FCT)CERN/FP/109290/2009
Classification Code:PACS: 04.30.Db, 04.25.Nx, 04.80.Cc.
Record Number:CaltechAUTHORS:20100526-113735041
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100526-113735041
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18458
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 May 2010 02:31
Last Modified:25 Feb 2016 00:00

Repository Staff Only: item control page