Constraints on cosmic strings using data from the first Advanced LIGO observing run

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dc.contributor.author Sengupta, Anand
dc.date.accessioned 2018-06-13T12:51:59Z
dc.date.available 2018-06-13T12:51:59Z
dc.date.issued 2018-05
dc.identifier.citation Sengupta, Anand et al., �Constraints on cosmic strings using data from the first Advanced LIGO observing run�, Physical Review D, DOI: 10.1103/PhysRevD.97.102002, vol. 97, no. 10, May 2018. en_US
dc.identifier.isbn 2470-0029
dc.identifier.issn 2470-0010
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevD.97.102002
dc.identifier.uri http://repository.iitgn.ac.in/handle/123456789/3735
dc.description.abstract Cosmic strings are topological defects which can be formed in grand unified theory scale phase transitions in the early universe. They are also predicted to form in the context of string theory. The main mechanism for a network of Nambu-Goto cosmic strings to lose energy is through the production of loops and the subsequent emission of gravitational waves, thus offering an experimental signature for the existence of cosmic strings. Here we report on the analysis conducted to specifically search for gravitational-wave bursts from cosmic string loops in the data of Advanced LIGO 2015-2016 observing run (O1). No evidence of such signals was found in the data, and as a result we set upper limits on the cosmic string parameters for three recent loop distribution models. In this paper, we initially derive constraints on the string tension�G?�and the intercommutation probability, using not only the burst analysis performed on the O1 data set but also results from the previously published LIGO stochastic O1 analysis, pulsar timing arrays, cosmic microwave background and big-bang nucleosynthesis experiments. We show that these data sets are complementary in that they probe gravitational waves produced by cosmic string loops during very different epochs. Finally, we show that the data sets exclude large parts of the parameter space of the three loop distribution models we consider.
dc.description.statementofresponsibility by Anand Sengupta et al.
dc.format.extent vol. 97, no. 10
dc.language.iso en en_US
dc.publisher American Physical Society en_US
dc.title Constraints on cosmic strings using data from the first Advanced LIGO observing run en_US
dc.type Article en_US
dc.relation.journal Physical Review D


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