Showing 41 - 60 results of 133 for search '"redshift"', query time: 0.05s Refine Results
  1. 41

    Quark Stars in Generalized Hybrid Metric-Palatini Gravity by Reyhaneh Aliannejadi, Zahra Haghani

    Published 2024-03-01
    “…All considered cases show that compact objects are more massive than their general relativity counterpart. The surface redshift and compactness are also obtained which shows that the generalized hybrid metric-Palatini quark stars have higher surface redshift and are more compact than general relativity quark stars.…”
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    Article
  2. 42

    Constraining the Parameters of Modified Chaplygin Gas in Einstein-Aether Gravity by Ujjal Debnath

    Published 2014-01-01
    “…We present the Hubble parameter in terms of some unknown parameters and observational parameters with the redshift z. From observed Hubble data (OHD) set (12 points), we have obtained the bounds of the arbitrary parameters (A,B) of MCG by minimizing the χ2 test. …”
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  3. 43
  4. 44

    What Drives the H i Content of Central Galaxies—A Comparison between Hydrodynamic Simulations and Observations Using Random Forest by Xiao Li, Cheng Li, H. J. Mo

    Published 2025-01-01
    “…We investigate the driving mechanisms for the H i gas content in star-forming central galaxies at low redshift, by examining the H i -to-stellar mass ratio ( M _H _i / M _* ) in both the state-of-the-art hydrodynamic simulations, IllustrisTNG (TNG) and EAGLE, and the xGASS sample. …”
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  5. 45

    Influence of variation in indium concentration and temperature on the threshold current density in InxGa1-xAs/GaAs QD laser diodes by Zainab M. Alharbi, M.S. Al-Ghamdi

    Published 2025-01-01
    “…This redshift, attributable to variations in bandgap energy that decrease as indium content increases, highlights QD laser instability. …”
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    Article
  6. 46

    Lorentz Distributed Noncommutative F(T,TG) Wormhole Solutions by M. Sharif, Kanwal Nazir

    Published 2018-01-01
    “…We take a particular redshift function and two F(T,TG) models. We analyze the behavior of shape function and also examine null as well as weak energy conditions graphically. …”
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    Article
  7. 47

    Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects by Jia-Peng Wei, Yong-Feng Huang, Lang Cui, Xiang Liu, Jin-Jun Geng, Xue-Feng Wu

    Published 2025-01-01
    “…Various effects such as the scattering broadening, the redshift-induced broadening, and the instrumental broadening are examined. …”
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    Article
  8. 48

    5σ tension between Planck cosmic microwave background and eBOSS Lyman-alpha forest and constraints on physics beyond ΛCDM by Keir K. Rogers, Vivian Poulin

    Published 2025-01-01
    “…We find that combined Planck cosmic microwave background, baryon acoustic oscillations, and supernovae data analyzed under Λ cold dark matter (ΛCDM) are in 4.9σ tension with the extended Baryon Oscillation Spectroscopic Survey (eBOSS) Lyα forest in inference of the linear matter power spectrum at wave number ∼1hMpc^{−1} and redshift = 3. Model extensions can alleviate this tension: running in the tilt of the primordial power spectrum (α_{s}∼−0.01); a fraction ∼(1−5)% of ultralight axion dark matter (DM) with particle mass ∼10^{−25} eV or warm DM with mass ∼10 eV. …”
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  9. 49

    Will There Be Future Deceleration? A Study of Particle Creation Mechanism in Nonequilibrium Thermodynamics by Supriya Pan, Subenoy Chakraborty

    Published 2015-01-01
    “…The deceleration parameter (q) is expressed as a function of the redshift parameter (z), and its variation is presented graphically. …”
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    Article
  10. 50

    Cosmology in the Universe with Distance Dependent Lorentz-Violating Background by C. A. G. Almeida, M. A. Anacleto, F. A. Brito, E. Passos, J. R. L. Santos

    Published 2017-01-01
    “…We consider a cosmological setup with inflaton in the presence of a redshift dependent Lorentz-violating time-like background to address the inflationary regime and other phases of the Universe. …”
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  11. 51

    A Cosmological Scaling Relation for Describing the Late Time Dynamics by Gerardo Cristofano, Orlando Luongo

    Published 2013-01-01
    “…Particularly, the broad interest on matching the scaling law, from early to late redshift regimes, may suggest the mechanism to relate quantum and classical aspects of gravity. …”
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    Article
  12. 52

    Gravitational-wave Dark Siren Cosmology Systematics from Galaxy Weighting by Alexandra G. Hanselman, Aditya Vijaykumar, Maya Fishbach, Daniel E. Holz

    Published 2025-01-01
    “…The detection of GW170817 and the measurement of its redshift from the associated electromagnetic counterpart provided the first gravitational-wave (GW) determination of the Hubble constant ( H _0 ), demonstrating the potential power of standard siren cosmology. …”
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  13. 53

    The Effect of Galaxy Interactions on Starbursts in Milky Way-mass Galaxies in FIRE Simulations by Fei Li, Mubdi Rahman, Norman Murray, Dušan Kereš, Andrew Wetzel, Claude-André Faucher-Giguère, Philip F. Hopkins, Jorge Moreno

    Published 2025-01-01
    “…We analyze the interaction torques and star formation activity on six galaxies from the FIRE-2 simulation suite with masses comparable to the Milky Way galaxy at redshift z = 0. We trace the halos from z = 3.6 to z = 0, calculating the torque exerted by the nearby galaxies on the gas in the central galaxy. …”
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  14. 54

    Controllable synthesis of Pd and Pt shells on Au nanoparticles with electrodeposition by Mohsen Elabbadi, Christina Boukouvala, Emilie Ringe

    Published 2025-01-01
    “…The deposition of thin shells of Pd or Pt initially leads to a damping of the Au localized surface plasmon resonance which is followed by its redshift and an increase in scattering intensity. These changes were rationalized with numerical calculations and correlated with electron microscopy analyses revealing the morphology and thickness of Pd and Pt shells. …”
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  15. 55

    Analyzing gravastar structure with the Finch-Skea metric in extended modified symmetric teleparallel gravity by Iqra Ibrar, M. Sharif

    Published 2025-02-01
    “…The model's stability is studied through the effective potential, redshift, causality conditions and adiabatic index. …”
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    Article
  16. 56

    No Need to Know: Toward Astrophysics-free Gravitational-wave Cosmology by Amanda M. Farah, Thomas A. Callister, Jose María Ezquiaga, Michael Zevin, Daniel E. Holz

    Published 2025-01-01
    “…Gravitational waves (GWs) from merging compact objects encode direct information about the luminosity distance to the binary. When paired with a redshift measurement, this enables standard-siren cosmology: a Hubble diagram can be constructed to directly probe the Universe’s expansion. …”
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  17. 57

    Stability of the thin shell from traversable Schwarzschild-like wormholes by Luis Liempi, Fabián Orellana, Mauricio Cataldo

    Published 2024-12-01
    “…The study is systematically divided to examine both positive and negative surface energy densities, and it delves into various gravitational redshift functions. Finally, it is concluded that the interaction of an external force on the thin shell significantly influences the behaviour of stable regions. …”
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  18. 58

    Photometric Selection of Type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk–Corona Connection by Jian Huang, Bin Luo, W. N. Brandt, Ying Chen, Qingling Ni, Yongquan Xue, Zijian Zhang

    Published 2025-01-01
    “…We used XGBoost to estimate photometric redshifts of our selected quasars. The estimated photometric redshifts span a range from 0.41 to 3.75. …”
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  19. 59

    Stability of a Noncanonical Scalar Field Model during Cosmological Date by Z. Ossoulian, T. Golanbari, H. Sheikhahmadi, Kh. Saaidi

    Published 2016-01-01
    “…The behavior of baryonic perturbations in linear perturbation scenario as a considerable amount of energy density of scalar field at low redshifts prevents the growth of perturbations in the ordinary matter fluid. …”
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  20. 60

    Properties of the wormhole model in de Rham–Gabadadze–Tolley like massive gravity with specific matter density by Piyali Bhar

    Published 2025-01-01
    “…We derive the WH geometry completely for the two different choices of redshift functions. The obtained WH solutions violate all the energy conditions, including the null energy condition (NEC). …”
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