Results 31 to 40 of about 847,988 (312)

Binary pulsars as probes for spin-2 ultralight dark matter [PDF]

Journal of Cosmology and Astroparticle Physics, 2019
Binary pulsars can be excellent probes of ultra-light dark matter. We consider the scenario where the latter is represented by a spin-2 field. The coherent oscillations of the dark matter field perturb the dynamics of binary systems, leading to secular ...
J. M. Armaleo, D. L. Nacir, F. Urban
semanticscholar   +1 more source

Testing extra dimensions with the binary pulsar [PDF]

Classical and Quantum Gravity, 2004
In this letter we calculate the emission of gravity waves by the binary pulsar in the framework of five dimensional braneworlds. We consider only spacetimes with one compact extra-dimension. We show that the presence of additional degrees of freedom, especially the 'gravi-scalar' leads to a modification of Einstein's quadrupole formula.
Durrer, Ruth, Kocian, Philippe
openaire   +5 more sources

Bounding the mass of graviton in a dynamic regime with binary pulsars [PDF]

Physical Review D, 2019
In Einstein's general relativity, gravity is mediated by a massless spin-2 metric field, and its extension to include a mass for the graviton has profound implications for gravitation and cosmology.
X. Miao, Lijing Shao, B. Ma
semanticscholar   +1 more source

Reduced-order surrogate models for scalar-tensor gravity in the strong field regime and applications to binary pulsars and GW170817 [PDF]

Physical Review D, 2019
We investigate the scalar-tensor gravity of Damour and Esposito-Far\`ese (DEF), which predicts nontrivial phenomena in the nonperturbative strong-field regime for neutron stars (NSs).
Junjie Zhao, Lijing Shao, Zhoujian Cao, B. Ma   +3 more
semanticscholar   +1 more source

Constraints of General Screened Modified Gravities from Comprehensive Analysis of Binary Pulsars [PDF]

Astrophysical Journal, 2019
Testing gravity using binary pulsars has become a key contemporary focus. Screened modified gravity is a kind of scalar-tensor theory with a screening mechanism in order to satisfy the tight solar system tests.
Xing Zhang, Wen Zhao, Tan Liu, Kai Lin, Chao Zhang, Xiang Zhao, Shaojun Zhang, Tao Zhu, Anzhong Wang   +8 more
semanticscholar   +1 more source

Ultralight Dark Matter Resonates with Binary Pulsars. [PDF]

Physical Review Letters, 2016
We consider the scenario where dark matter (DM) is represented by an ultralight classical scalar field performing coherent periodic oscillations. We point out that such DM perturbs the dynamics of binary systems either through its gravitational field or ...
D. Blas, D. L. Nacir, S. Sibiryakov
semanticscholar   +1 more source

Vector fuzzy dark matter, fifth forces, and binary pulsars [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
We study the secular effects that an oscillating background ultralight (fuzzy) cosmological vector field has on the dynamics of binary systems; such effects appear when the field and the binary are in resonance.
D. L. Nacir, F. Urban
semanticscholar   +1 more source

A Massive Pulsar in a Compact Relativistic Binary [PDF]

Science, 2013
Pulsar Tests Gravity Because of their extremely high densities, massive neutron stars can be used to test gravity. Based on spectroscopy of its white dwarf companion, Antoniadis et al. (p.
Paulo C. C. Freire, Timothy T. Pennucci, Scott M. Ransom, Joeri van Leeuwen, Joeri van Leeuwen, Norbert Langer, V. I. Kondratiev, V. I. Kondratiev, Victoria M. Kaspi, David G. Whelan, Ingrid H. Stairs, T. Driebe, Maura McLaughlin, John Antoniadis, Marten H. van Kerkwijk, Thomas M. Tauris, Norbert Wex, V. S. Dhillon, Ryan S. Lynch, C. G. Bassa, Michael Kramer, Michael Kramer, Jason W. T. Hessels, Jason W. T. Hessels, Tom Marsh, Joris P. W. Verbiest   +25 more
openaire   +4 more sources

Secular effects of ultralight dark matter on binary pulsars [PDF]

Physical Review D, 2019
Dark matter (DM) can consist of very light bosons behaving as a classical scalar field that experiences coherent oscillations. The presence of this DM field would perturb the dynamics of celestial bodies, either because the (oscillating) DM stress tensor
D. Blas, D. L. Nacir, S. Sibiryakov
semanticscholar   +1 more source

Interpretation of Binary Pulsar Observations [PDF]

Symposium - International Astronomical Union, 1981
The nature, dynamics and evolution of the three known radio pulsar binaries are discussed. The system containing 1913+16 appears to comprise two ~1.4 M⊙ components, and to undergo orbital decay as predicted by general relativity. It is proposed that 1913+16 has a neutron star companion and that 0655+64 and 0820+02 have white dwarf companions which ...
Blandford, R. D., DeCampli, W. M.
openaire   +5 more sources