Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Mörtsell, Edvard"'
Autor:
Guerrini, Sacha, Mörtsell, Edvard
Publikováno v:
Phys. Rev. D 109, 023533 (2024)
Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kpc-Mpc scale. In this work, the gravitational slip parameter $\gamma_{\rm PN}$, measuring the amplitude of a hypotheti
Externí odkaz:
http://arxiv.org/abs/2309.11915
Autor:
Högås, Marcus, Mörtsell, Edvard
Fifth forces are ubiquitous in modified theories of gravity. In this paper, we analyze their effect on the Cepheid-calibrated cosmic distance ladder, specifically with respect to the inferred value of the Hubble constant ($H_0$). We consider a variet
Externí odkaz:
http://arxiv.org/abs/2309.01744
Autor:
Högås, Marcus, Mörtsell, Edvard
Fifth forces are ubiquitous in modified theories of gravity. To be compatible with observations, such a force must be screened on solar-system scales but may still give a significant contribution on galactic scales. If this is the case, the fifth for
Externí odkaz:
http://arxiv.org/abs/2303.12827
Autor:
Goobar, Ariel, Johansson, Joel, Schulze, Steve, Arendse, Nikki, Carracedo, Ana Sagués, Dhawan, Suhail, Mörtsell, Edvard, Fremling, Christoffer, Yan, Lin, Perley, Daniel, Sollerman, Jesper, Joseph, Rémy, Hinds, K-Ryan, Meynardie, William, Andreoni, Igor, Bellm, Eric, Bloom, Josh, Collett, Thomas E., Drake, Andrew, Graham, Matthew, Kasliwal, Mansi, Kulkarni, Shri, Lemon, Cameron, Miller, Adam A., Neill, James D., Nordin, Jakob, Pierel, Justin, Richard, Johan, Riddle, Reed, Rigault, Mickael, Rusholme, Ben, Sharma, Yashvi, Stein, Robert, Stewart, Gabrielle, Townsend, Alice, Vinko, Jozsef, Wheeler, J. Craig, Wold, Avery
Detecting gravitationally lensed supernovae is among the biggest challenges in astronomy. It involves a combination of two very rare phenomena: catching the transient signal of a stellar explosion in a distant galaxy and observing it through a nearly
Externí odkaz:
http://arxiv.org/abs/2211.00656
Recent surveys have discovered a population of faint supernovae, known as Ca-rich gap transients, inferred to originate from explosive ignitions of white dwarfs. In addition to their unique spectra and luminosities, these supernovae have an unusual s
Externí odkaz:
http://arxiv.org/abs/2211.00013
Publikováno v:
JCAP07(2022)003
A potential solution to the Hubble tension is the hypothesis that the Milky Way is located near the center of a matter underdensity. We model this scenario through the Lema\^itre-Tolman-Bondi formalism with the inclusion of a cosmological constant ($
Externí odkaz:
http://arxiv.org/abs/2110.04226
Autor:
Högås, Marcus, Mörtsell, Edvard
Bimetric gravity is a ghost-free and observationally viable extension of general relativity, exhibiting both a massless and a massive graviton. The observed abundances of light elements can be used to constrain the expansion history of the Universe a
Externí odkaz:
http://arxiv.org/abs/2106.09030
Autor:
Högås, Marcus, Mörtsell, Edvard
Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. For the background cosmology and th
Externí odkaz:
http://arxiv.org/abs/2101.08794
Autor:
Högås, Marcus, Mörtsell, Edvard
Ghost-free bimetric gravity is a theory of two interacting spin-2 fields, one massless and one massive, in addition to the standard matter particles and fields, thereby generalizing Einstein's theory of general relativity. To parameterize the theory,
Externí odkaz:
http://arxiv.org/abs/2101.08795
Publikováno v:
JCAP04(2020)046
Bimetric gravity can reproduce the accelerated expansion of the Universe, without a cosmological constant. However, the stability of these solutions to linear perturbations has been questioned, suggesting exponential growth of structure in this appro
Externí odkaz:
http://arxiv.org/abs/1910.01651