Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Sawicki, Ignacy"'
Static black holes in general relativity modified by a linear scalar coupling to the Gauss-Bonnet invariant always carry hair. We show that the same mechanism that creates the hair makes it incompatible with a cosmological horizon. Other scalar-tenso
Externí odkaz:
http://arxiv.org/abs/2403.15537
Autor:
Brando, Guilherme, Koyama, Kazuya, Wands, David, Zumalacárregui, Miguel, Sawicki, Ignacy, Bellini, Emilio
The N-body gauge allows the introduction of relativistic effects in Newtonian cosmological simulations. Here we extend this framework to general Horndeski gravity theories, and investigate the relativistic effects that the scalar field introduces in
Externí odkaz:
http://arxiv.org/abs/2105.04491
Publikováno v:
JCAP02(2020)008
Cosmological datasets have great potential to elucidate the nature of dark energy and test gravity on the largest scales available to observation. Theoretical predictions can be computed with hi_class (www.hiclass-code.net), an accurate, fast and fle
Externí odkaz:
http://arxiv.org/abs/1909.01828
The goal of this short report is to summarise some key results based on our previous works on model independent tests of gravity at large scales in the Universe, their connection with the properties of gravitational waves, and the implications of the
Externí odkaz:
http://arxiv.org/abs/1812.03969
Autor:
Tansella, Vittorio, Bonvin, Camille, Cusin, Giulia, Durrer, Ruth, Kunz, Martin, Sawicki, Ignacy
Publikováno v:
Phys. Rev. D 98, 103515 (2018)
We study the impact on the galaxy correlation function of the presence of a vector component in the tracers' peculiar velocities, in the case in which statistical isotropy is violated. We present a general framework - based on the bipolar spherical h
Externí odkaz:
http://arxiv.org/abs/1807.00731
We use the most recent, complete and independent measurements of masses and radii of white dwarfs in binaries to bound the class of non-trivial modified gravity theories, viable after GW170817/GRB170817, using its effect on the mass-radius relation o
Externí odkaz:
http://arxiv.org/abs/1803.00541
The recent discovery of a $\gamma$-ray counterpart to a gravitational wave event has put extremely stringent constraints on the speed of gravitational waves at the present epoch. In turn, these constraints place strong theoretical pressure on potenti
Externí odkaz:
http://arxiv.org/abs/1712.08623
Publikováno v:
JCAP02(2018)028
We compute a general expression for the contribution of vector perturbations to the redshift-space distortion of galaxy surveys. We show that they contribute to the same multipoles of the correlation function as scalar perturbations and should thus i
Externí odkaz:
http://arxiv.org/abs/1712.00052
Publikováno v:
Phys. Rev. Lett. 120, 131101 (2018)
The coincident detection of gravitational waves (GW) and a gamma-ray burst from a merger of neutron stars has placed an extremely stringent bound on the speed of GW. We showed previously that the presence of gravitational slip ($\eta$) in cosmology i
Externí odkaz:
http://arxiv.org/abs/1711.04825
Autor:
Baker, Tessa, Bellini, Emilio, Ferreira, Pedro G., Lagos, Macarena, Noller, Johannes, Sawicki, Ignacy
Publikováno v:
Phys. Rev. Lett. 119, 251301 (2017)
The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity. We show that this measurement allows us to pl
Externí odkaz:
http://arxiv.org/abs/1710.06394