Extreme parameter sensitivity in quasidilaton massive gravity

We reanalyze the behavior of Friedmann-Lemaître-Robertson-Walker cosmologies in the recently proposed quasidilaton massive-gravity model, and discover that the background dynamics present hitherto unreported features that require unexpected fine-tuning of the additional fundamental parameters of the...

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Autor principal: López Nacir, Diana Laura
Publicado: 2015
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n8_p_Anselmi
http://hdl.handle.net/20.500.12110/paper_15507998_v92_n8_p_Anselmi
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_15507998_v92_n8_p_Anselmi2023-06-08T16:22:59Z Extreme parameter sensitivity in quasidilaton massive gravity López Nacir, Diana Laura We reanalyze the behavior of Friedmann-Lemaître-Robertson-Walker cosmologies in the recently proposed quasidilaton massive-gravity model, and discover that the background dynamics present hitherto unreported features that require unexpected fine-tuning of the additional fundamental parameters of the theory for an observationally consistent background cosmology. We also identify new allowed regions in the parameter space and exclude some of the previously considered ones. The evolution of the mass of gravitational waves reveals nontrivial behavior, exhibiting a mass-squared that may be negative in the past, and that presently, while positive, is larger than the square of the Hubble parameter, H02. These properties of the gravity-wave mass have the potential to lead to observational tests of the theory. While quasidilaton massive gravity is known to have issues with stability at short distances, the current analysis is a first step toward the investigation of the more stable extended quasidilaton massive-gravity theory, with some expectation that both the fine-tuning of parameters and the interesting behavior of the gravity-wave mass will persist. © 2015 American Physical Society. Fil:López Nacir, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n8_p_Anselmi http://hdl.handle.net/20.500.12110/paper_15507998_v92_n8_p_Anselmi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We reanalyze the behavior of Friedmann-Lemaître-Robertson-Walker cosmologies in the recently proposed quasidilaton massive-gravity model, and discover that the background dynamics present hitherto unreported features that require unexpected fine-tuning of the additional fundamental parameters of the theory for an observationally consistent background cosmology. We also identify new allowed regions in the parameter space and exclude some of the previously considered ones. The evolution of the mass of gravitational waves reveals nontrivial behavior, exhibiting a mass-squared that may be negative in the past, and that presently, while positive, is larger than the square of the Hubble parameter, H02. These properties of the gravity-wave mass have the potential to lead to observational tests of the theory. While quasidilaton massive gravity is known to have issues with stability at short distances, the current analysis is a first step toward the investigation of the more stable extended quasidilaton massive-gravity theory, with some expectation that both the fine-tuning of parameters and the interesting behavior of the gravity-wave mass will persist. © 2015 American Physical Society.
author López Nacir, Diana Laura
spellingShingle López Nacir, Diana Laura
Extreme parameter sensitivity in quasidilaton massive gravity
author_facet López Nacir, Diana Laura
author_sort López Nacir, Diana Laura
title Extreme parameter sensitivity in quasidilaton massive gravity
title_short Extreme parameter sensitivity in quasidilaton massive gravity
title_full Extreme parameter sensitivity in quasidilaton massive gravity
title_fullStr Extreme parameter sensitivity in quasidilaton massive gravity
title_full_unstemmed Extreme parameter sensitivity in quasidilaton massive gravity
title_sort extreme parameter sensitivity in quasidilaton massive gravity
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n8_p_Anselmi
http://hdl.handle.net/20.500.12110/paper_15507998_v92_n8_p_Anselmi
work_keys_str_mv AT lopeznacirdianalaura extremeparametersensitivityinquasidilatonmassivegravity
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