Results 51 to 60 of about 7,025,957 (218)

A Possible Solution to the Mystery of the ANITA Anomalous Events

Annalen der Physik, Volume 538, Issue 4, April 2026.
In 2006 and 2014, the Antarctic Impulsive Transient Antenna (ANITA), a balloon‐borne radio observatory flying over Antarctica, detected two strange upward‐going radio pulse events that have not yet been explained by our current understanding of physics.
Massimo Villata
wiley   +1 more source

A JWST Medium-resolution MIRI Spectrum and Models of the Type Ia Supernova 2021aefx at +415 days

The Astrophysical Journal
We present a JWST MIRI medium-resolution spectrometer spectrum (5–27 μ m) of the Type Ia supernova (SN Ia) SN 2021aefx at +415 days past B -band maximum.
C. Ashall, P. Hoeflich, E. Baron, M. Shahbandeh, J. M. DerKacy, K. Medler, B. J. Shappee, M. A. Tucker, E. Fereidouni, T. Mera, J. Andrews, D. Baade, K. A. Bostroem, P. J. Brown, C. R. Burns, A. Burrow, A. Cikota, T. de Jaeger, A. Do, Y. Dong, I. Dominguez, O. Fox, L. Galbany, E. Y. Hsiao, K. Krisciunas, B. Khaghani, S. Kumar, J. Lu, J. R. Maund, P. Mazzali, N. Morrell, F. Patat, C. Pfeffer, M. M. Phillips, J. Schmidt, S. Stangl, C. P. Stevens, M. D. Stritzinger, N. B. Suntzeff, C. M. Telesco, L. Wang, Y. Yang   +41 more
doaj   +1 more source

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

Nebular-phase spectra of nearby Type Ia Supernovae

, 2017
We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at > 200 d after peak brightness using the Gemini South and Keck telescopes. All of the SNe Ia in our sample were nearby, well separated from their host galaxy's light, and have ...
A. V. Filippenko, M. L. Graham, D. J. Sand, G. Hosseinzadeh, Hosseinzadeh, G., Sand, David J., Parrent, J. T., J. T. Parrent, Graham, M. L., D. A. Howell, D. Hiramatsu, Valenti, S., S. Valenti, I. Arcavi, C. McCully, Hiramatsu, D., Arcavi, I., S. Kumar, Kumar, S., Howell, D. A., McCully, C., Filippenko, A. V.   +21 more
core   +1 more source

SN 2019dks: A 99aa-like Type Ia Supernova with a Low-velocity Gradient

The Astrophysical Journal
We provide an in-depth analysis of optical photometric and spectroscopic observations for the overluminous Type Ia supernova SN 2019dks, distinguished by a low-velocity gradient. This supernova achieves a B -band absolute magnitude of ${M}_{\max }({\rm{B}
Jiajun Cai, Xiangyun Zeng, Wei Zhou, Sai Li, Sheng Zheng, Zhengxue Chang, D. Andrew Howell, K. Azalee Bostroem, Rongjun Zhang, Yangyang Li, Curtis McCully, Craig Pellegrino, Moira Andrews, Joseph R. Farah, Megan Newsome   +14 more
doaj   +1 more source

Kaniadakis Holographic Dark Energy Behavior in f(Q) Theory

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
ABSTRACT In this study, the cosmological behavior of the Kaniadakis holographic dark energy model is investigated under the f(Q)$f(Q)$ theory within the framework of a flat Friedmann–Robertson–Walker (FRW) universe. The generalized holographic energy density based on Kaniadakis entropy is modeled using the Hubble horizon infrared cutoff scale, and the ...
Sinem Kalkan, Can Aktaş
wiley   +1 more source

Type Ia supernovae

Journal of Physics: Conference Series, 2007
At its heart, a Type Ia supernova is a problem in turbulent nuclear combustion. There are four sub-problems, each of which has eluded solution for decades, but which can be addressed by large scale simulation. First is the ignition – where and how often the burning is ignited in the convective core of an exploding white dwarf star.
Woosley, S., Almgren, A., Bell, J., Glatzmaier, G., Kasen, D., Kerstein, A., Ma, H., Nugent, P., Röpke, F., Sankaran, V., Zingale, M.   +10 more
openaire   +2 more sources

Type Ia supernovae as speed sensors at intermediate redshifts

, 2008
Large scale peculiar velocity (LSPV) is a crucial probe of dark matter, dark energy, and gravity at cosmological scales. However, its application is severely limited by measurement obstacles. We show that fluctuations in type Ia supernovae fluxes induced
Chen, Xuelei, Zhang, Pengjie
core   +1 more source

Flight of the Bumblebee: the Early Excess Flux of Type Ia Supernova 2023bee Revealed by TESS, Swift, and Young Supernova Experiment Observations

The Astrophysical Journal
We present high-cadence ultraviolet through near-infrared observations of the Type Ia supernova (SN Ia) 2023bee at D = 32 ± 3 Mpc, finding excess flux in the first days after explosion, particularly in our 10 minutes cadence TESS light curve and Swift UV
Qinan Wang, Armin Rest, Georgios Dimitriadis, Ryan Ridden-Harper, Matthew R. Siebert, Mark Magee, Charlotte R. Angus, Katie Auchettl, Kyle W. Davis, Ryan J. Foley, Ori D. Fox, Sebastian Gomez, Jacob E. Jencson, David O. Jones, Charles D. Kilpatrick, Justin D. R. Pierel, Anthony L. Piro, Abigail Polin, Collin A. Politsch, César Rojas-Bravo, Melissa Shahbandeh, V. Ashley Villar, Yossef Zenati, C. Ashall, Kenneth C. Chambers, David A. Coulter, Thomas de Boer, Nico DiLullo, Christa Gall, Hua Gao, Eric Y. Hsiao, Mark E. Huber, Luca Izzo, Nandita Khetan, Natalie LeBaron, Eugene A. Magnier, Kaisey S. Mandel, Peter McGill, Hao-Yu Miao, Yen-Chen Pan, Catherine P. Stevens, Jonathan J. Swift, Kirsty Taggart, Grace Yang   +43 more
doaj   +1 more source

Room‐temperature crystal structures of [CH(NH2)2]3Sb2X9 (X = Br and I)

Acta Crystallographica Section C, Volume 82, Issue 3, Page 138-143, March 2026.
Two new vacancy‐ordered formamidinium antimony halide triple‐perovskites, FA3Sb2X9 {FA = [CH(NH2)2]+; X = Br and I}, measured by single‐crystal X‐ray diffraction are described.Crystals of formamidinium antimony, halides, FA3Sb2X9 {FA = [CH(NH2)2]+; X = Br− and I−} {or triformamidinium nonahalidodiantimony, (CH5N2)3[Sb2X9]}, have been synthesized using ...
Prajna Bhatt, Yuhan Liu, Anna Regoutz, Robert G. Palgrave   +3 more
wiley   +1 more source