Article
Astronomy & Astrophysics
Antonio De Felice, Shinji Mukohyama
Summary: This paper introduces a new cosmological framework integrating dark matter into a minimally modified gravity model, maintaining the same number of gravitational degrees of freedom through a series of transformations. The framework includes two time-dependent free functions to achieve desired evolutions of Hubble expansion rate and effective gravitational constant for dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
V Ruhlmann-Kleider, C. Lidman, A. Moller
Summary: This study investigates the systematic uncertainties associated with SN Ia Hubble diagrams. The results show that photometric redshifts and contamination lead to biased cosmological parameters, but this bias can be corrected by considering photometric redshift uncertainties and contamination. By propagating redshift uncertainties into the cosmological likelihood computation, the residual cosmological bias can be further reduced.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Dhawan, E. Morstell
Summary: The nature of dark matter and the possibility of it being comprised of primordial black holes are investigated using Type Ia supernovae. The fraction of dark matter in compact objects is constrained to be below 0.50 at 95% confidence level, demonstrating robustness to different cosmological models. With a prior assumption on the homogeneity parameter, it is found that the fraction of dark matter in primordial black holes is less than 0.32 at 95% confidence level. The study concludes that stellar mass primordial black holes cannot account for all of the observed dark matter.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
W. D. Kenworthy, D. O. Jones, M. Dai, R. Kessler, D. Scolnic, D. Brout, M. R. Siebert, J. D. R. Pierel, K. G. Dettman, G. Dimitriadis, R. J. Foley, S. W. Jha, Y-C Pan, A. Riess, S. Rodney, C. Rojas-Bravo
Summary: The study introduces an improved SALT3 model framework for SNe Ia SED modeling, which offers advantages such as improved estimation of uncertainties, better separation of color and light-curve stretch, and publicly available training code. By training the model on a large sample, an extended wavelength range and reduced uncertainties were achieved, enabling accurate distance measurements for low-z supernovae.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Heinrich Steigerwald, Davi Rodrigues, Stefano Profumo, Valerio Marra
Summary: Residuals in the Hubble diagram at optical wavelengths and host galaxy stellar mass in SNe Ia are observed to correlate. Progenitor channels based on dark matter, including the proposal of triggering 'normal' SNe Ia with asteroid-mass PBHs, have attracted attention. A method to estimate the local DM density and velocity dispersion is presented, and a luminosity step is found in SN Ia progenitors based on high versus low DM density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Rajendra P. Gupta
Summary: Ia supernovae are used as standard candles in cosmology, and their luminosity is found to depend on their distance when physical constants are allowed to evolve. Results suggest that SNeIa luminosities could have been much higher in the past, potentially leading to significant discrepancies in distance estimations for early supernovae. Variations in constants are given, showing that they can only vary concurrently rather than individually.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
C. Meldorf, A. Palmese, D. Brout, R. Chen, D. Scolnic, L. Kelsey, L. Galbany, W. G. Hartley, T. M. Davis, A. Drlica-Wagner, M. Vincenzi, J. Annis, M. Dixon, O. Graur, C. Lidman, A. Moller, P. Nugent, B. Rose, M. Smith, S. Allam, D. L. Tucker, J. Asorey, J. Calcino, D. Carollo, K. Glazebrook, G. F. Lewis, G. Taylor, B. E. Tucker, A. G. Kim, H. T. Diehl, M. Aguena, F. Andrade-Oliveira, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, M. Carrasco Kind, F. J. Castander, M. Costanzi, L. N. da Costa, S. Desai, P. Doel, S. Everett, I Ferrero, D. Friedel, J. Frieman, J. Garcia-Bellido, M. Gatti, D. Gruen, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, M. March, J. L. Marshall, F. Menanteau, R. Miquel, R. Morgan, F. Paz-Chinchon, M. E. S. Pereira, A. A. Plazas Malagon, E. Sanchez, V Scarpine, I Sevilla-Noarbe, E. Suchyta, G. Tarle, T. N. Varga
Summary: Cosmological analyses with type Ia supernovae often overlook the varying dust properties in host galaxies, resulting in inaccurate conclusions. In this study, we use advanced modeling to characterize the dust parameters of 1100 Dark Energy Survey SN host galaxies and find that host dust has important impacts on SN cosmology, including a wide range of dust law slope R-V, lower R-V in high-stellar mass hosts compared to low-mass hosts, and a significant correlation between the Hubble diagram residuals of red SNe Ia and host R-V. These findings confirm recent predictions based on dust and provide insights into the "mass step" and intrinsic scatter in SN Ia analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yuewei Wen, Eva Nesbit, Dragan Huterer, Scott Watson
Summary: Standard cosmological data analyses can't easily determine the presence of modified gravity. This study presents a quantitative mapping showing how modified gravity models appear within standard analyses, reporting specific biases in standard-parameter spaces. The implications for measurements of mass fluctuations are also discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
G. Taylor, C. Lidman, B. E. Tucker, D. Brout, S. R. Hinton, R. Kessler
Summary: This study presents a revised Spectral Adaptive Light Curve Template (SALT2-2021) for fitting the light curves of Type Ia supernovae (SNe Ia), which introduces significant changes in the UV region and alters the distance measurements of SNe Ia. By applying the revised SALT2 surface to public data and cosmic microwave background constraints, a change in the dark energy equation-of-state parameter is found, emphasizing the importance of controlling and reducing systematic uncertainties for future supernova analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
D. R. Pierel, D. O. Jones, W. D. Kenworthy, M. Dai, R. Kessler, C. Ashall, A. Do, E. R. Peterson, B. J. Shappee, M. R. Siebert, T. Barna, T. G. Brink, J. Burke, A. Calamida, Y. Camacho-Neves, T. de Jaeger, A. Filippenko, R. J. Foley, L. Galbany, O. D. Fox, S. Gomez, D. Hiramatsu, R. Hounsell, D. A. Howell, S. W. Jha, L. A. Kwok, I Perez-Fournon, F. Poidevin, A. Rest, D. Rubin, D. M. Scolnic, R. Shirley, L. G. Strolger, S. Tinyanont, Q. Wang
Summary: A large fraction of Type Ia supernova observations in the future will focus on the near-infrared wavelengths. To reduce standardization uncertainties, researchers have trained a new model in the near-infrared wavelengths, and found that using the near-infrared light-curve can significantly reduce residual scatter and there is a correlation between the light-curve stretch measurements and luminosity.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Lluis Galbany, Mat Smith, Salvador Duarte Puertas, Santiago Gonzalez-Gaitan, Ismael Pessa, Masao Sako, Jorge Iglesias-Paramo, A. R. Lopez-Sanchez, Mercedes Molla, Jose M. Vilchez
Summary: We used data from the Sloan Digital Sky Survey-II Supernova Survey and SDSS DR16 fiber spectroscopy to investigate the correlation between type Ia supernova light-curve parameters and Hubble residuals with host galaxy properties. We found that fixed-aperture fiber spectroscopy suffers from aperture effects, which can be corrected using integral field spectroscopy. Our study provides insights into the relationship between supernovae and their host galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Yan-Hong Yao, Xin-He Meng
Summary: This paper investigates the impact of backreaction effects in the spatially averaged inhomogeneous Universe and proposes new effective sources for backreaction effects, namely the effective perfect fluid energy density and pressure. The backreaction models are fitted using two metrics, the Friedmann-Lemaitre-Robertson-Walker metric and a template metric with an evolving curvature parameter. The results show that there are significant parameter tensions between different data sets, indicating a need for modifications in the treatment of the geometrical instantaneous spatially-constant curvature.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Bikash R. Dinda, Narayan Banerjee
Summary: We applied a model-independent and nonparametric approach based on Gaussian process regression to constrain the peak absolute magnitude, M-B, of type Ia supernovae using the Pantheon sample and cosmic chronometer data. Our analysis yielded percent level bounds on M-B as M-B = -19.384 +/- 0.052. Including baryon acoustic oscillation data and the prior of comoving sound horizon from Planck 2018 CMB observations resulted in tighter constraints at the subpercent level. Combining Pantheon compilation, baryon acoustic oscillation observations, and cosmic chronometer observations, we obtained consistent values for M-B around -19.4.
Article
Astronomy & Astrophysics
J. Johansson, S. B. Cenko, O. D. Fox, S. Dhawan, A. Goobar, V Stanishev, N. Butler, W. H. Lee, A. M. Watson, U. C. Fremling, M. M. Kasliwal, P. E. Nugent, T. Petrushevska, J. Sollerman, L. Yan, J. Burke, G. Hosseinzadeh, D. A. Howell, C. McCully, S. Valenti
Summary: The study presented optical and NIR observations of 42 Type Ia supernovae, and found no evidence for a mass step between color- and stretch-corrected peak J and H magnitudes for galaxies of different host stellar masses. The mass step remained significant at optical wavelengths when using a global R-V, but vanished when each SN was corrected using their individual best-fit R-V.
ASTROPHYSICAL JOURNAL
(2021)
Article
Physics, Multidisciplinary
Junchao Wang, Zhiqi Huang, Lu Huang
Summary: Much of the research in supernova cosmology is based on the assumption that the peak luminosity of type Ia supernovae (SNe Ia) is independent of the galactic environment. Recent studies suggest a significant correlation between standardized luminosity and the progenitor age of SNe Ia, casting doubt on the direct evidence of cosmic acceleration. This study incorporates the uncertainties of progenitor ages into a Bayesian inference framework and finds a weaker dependence of supernova standardized luminosity on the progenitor age, but the correlation remains significant. The research confirms that the bias in progenitor age could be the primary cause of the observed extra dimming of distant SNe Ia when intrinsic scatter is not included in the analysis. Model comparison using the PAge formalism suggests that the ΛCDM model remains a good fit when intrinsic scatter is included, but faces challenges without it.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Particles & Fields
A. Salehi, S. Aftabi
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Astronomy & Astrophysics
Amin Salehi, Mohammad Reza Setare
GENERAL RELATIVITY AND GRAVITATION
(2017)
Article
Astronomy & Astrophysics
H. Farajollahi, A. Shahabi, A. Salehi
ASTROPHYSICS AND SPACE SCIENCE
(2012)
Article
Astronomy & Astrophysics
H. Farajollahi, A. Salehi
ASTROPHYSICS AND SPACE SCIENCE
(2012)
Article
Astronomy & Astrophysics
H. Farajollahi, A. Salehi
GENERAL RELATIVITY AND GRAVITATION
(2013)
Article
Optics
Hamze Fuladvand, Amin Salehi, Nader Daneshfar, Alireza Bahrampour, Reza Farrahi Moghaddam
Article
Astronomy & Astrophysics
Hossein Farajollahi, Amin Salehi
Article
Astronomy & Astrophysics
A. Salehi, M. Yarahmadi, S. Fathi, Kazuharu Bamba
Summary: The study investigates the bulk flow of the local universe using Type Ia supernova data, finding agreement with the ΛCDM model at low redshifts but disagreement at high redshifts. The results support previous studies suggesting a large bulk flow in the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Amin Salehi, M. Pourali, Y. Abedini
Summary: This paper investigates the Hubble IR cutoff in Barrow holographic dark energy with neutrino masses using the latest observational data. It shows that the holographic dark energy disfavors the Hubble parameter as a candidate for the IR cutoff in spatially flat FRW cosmologies. The exponent parameter Delta in Barrow holographic dark energy significantly affects the EoS parameter and under certain conditions, the universe could experience accelerated expansion. Constraint on the model parameters is also obtained using current cosmological observations.
GENERAL RELATIVITY AND GRAVITATION
(2023)
Article
Astronomy & Astrophysics
H. Mohammadi, A. Salehi
Summary: Inspired by the characteristics of Covid-19 and its impact on human cells, Barrow suggests that quantum gravitational effects could lead to complex and fractal properties on the black hole horizon. Using the Tsallis entropy formula, modified Friedmann equations describing the dynamics of the universe are derived. The Tsallis parameter q measures the level of nonextensivity or extensivity of a specific system. The modified geometry term caused by Barrow Tsallis entropy correction plays the role of dark energy, explaining the acceleration of the universe.
Article
Physics, Multidisciplinary
Pedram Bazvand, Amin Salehi, Reza Sepahvand
Summary: In the standard model of particle physics, neutrinos are massless and only interact through the weak force. Cosmological data can provide valuable insights into the mass and properties of neutrinos. This study investigates the constraints on the total neutrino mass and the number of relativistic degrees of freedom in a rolling tachyon model. The observational data suggest that the neutrino mass is less than 0.273eV and the number of relativistic degrees of freedom is approximately 3.29.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Particles & Fields
A. Salehi
Summary: By considering a fractal structure for the black hole horizon, Barrow proposed a modification to the entropy due to quantum-gravitational effects, leading to a modification in the Friedmann equations. This modification allows for the determination of the amount of deviation from standard cosmology by reconstructing a parameter delta in terms of curvature parameters.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Amin Salehi, H. Hatami
Summary: It is suggested that the universe may have experienced more than one transition from deceleration to acceleration during its evolution, and the chameleon cosmological model is favored in explaining this phenomenon.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Hamid Reza Amiri, Amin Salehi, Amir Hossein Noroozi
Summary: This paper investigates the constraints on the total neutrino mass in a cosmological model with dark energy-neutrino coupling, finding the neutrino mass tightly constrained to 0.125 eV and the effective extra relativistic degrees of freedom to be 2.955. The results are in good agreement with the Standard Model prediction and Planck 2018 results.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
A. Salehi
