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24 papers · 2 filters
Preinflationary perturbations from the closed algebra approach in loop quantum cosmology
Bao-Fei Li, Tao Zhu, Anzhong Wang +3
In this paper, the scalar and tensor perturbations in the closed algebra approach of loop quantum cosmology are studied. Instead of the distant past in the contracting phase, we ch…
New observational constraints on gravity through gravitational-wave astronomy
Rafael C. Nunes, Supriya Pan, Emmanuel N. Saridakis
We investigate the new observational constraints on gravity that arise from the effects of primordial gravitational waves (GWs) on the cosmic microwave background (CMB) anis…
`Hidden' symmetry of linearized gravity in de Sitter space
Hamed Pejhan, Surena Rahbardehghan, Mohammad Enayati +2
We demonstrate that the linearized Einstein gravity in de Sitter (dS) spacetime besides the evident symmetries also possesses the additional (local) symmetry $h_{μν}\rightarrow h_{…
Rotating AdS black holes in Maxwell- gravity
G. G. L. Nashed, Emmanuel N. Saridakis
The investigation on higher-dimensional AdS black holes is of great importance under the light of AdS/CFT correspondence. In this work we study static and rotating, uncharged and c…
Angular momentum loss for eccentric compact binary in screened modified gravity
Xing Zhang, Wen Zhao, Tan Liu +6
Gravitational wave (GW) observations provide insight into the gravity regime. These observations relies on the comparison of the data to the GWs model, which depends on the orbital…
Constraints on quintessence scalar field models using cosmological observations
Weiqiang Yang, M. Shahalam, Barun Pal +2
We consider a varieties of quintessence scalar field models in a homogeneous and isotropic geometry of the universe with zero spatial curvature aiming to provide stringent constrai…