Results 101 to 110 of about 355,593 (244)

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

Dissecting the Massive Pristine, Neutral Gas Reservoir of a Remarkably Bright Galaxy at z = 14.179

The Astrophysical Journal Letters
At cosmic dawn, the first stars and galaxies are believed to form from and be deeply embedded in clouds of dense, pristine gas. Here we present a study of the James Webb Space Telescope/NIRSpec data of the most distant, spectroscopically confirmed galaxy
Kasper E. Heintz, Clara L. Pollock, Joris Witstok, Stefano Carniani, Kevin N. Hainline, Francesco D’Eugenio, Chamilla Terp, Aayush Saxena, Darach Watson   +8 more
doaj   +1 more source

Bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and nonlinear galaxy bias [PDF]

Physical Review D, 2007
16 pages, 8 ...
Sefusatti, Emiliano, /Fermilab, Komatsu, Eiichiro, /Texas U., Astron. Dept.   +3 more
openaire   +3 more sources

The fall of the Haag (LL4‐6) chondrite breccia—Just 8 years after the nearby fall Stubenberg (LL6)

Meteoritics &Planetary Science, Volume 60, Issue 11, Page 2676-2702, November 2025.
Abstract On October 24, 2024, an impressive fireball was visible over Austria. After the possible strewn field was calculated, the first sample of the Haag meteorite, with a mass of 8.76 g, was discovered on November 2, 2024, 8 days after the fireball event. Four more samples were found afterward putting the total sample mass at about 151 g.
Addi Bischoff, Markus Patzek, Jean‐Alix Barrat, Stig Bartel, Jasper Berndt, Henner Busemann, Tommaso Di Rocco, Mattias Ek, Manuela A. Fehr, Dieter Heinlein, Daniela Krietsch, Björn Lehnert, Colin Maden, Oscar Marchhart, Martin Martschini, Silke Merchel, Andreas Pack, Andrea Patzer, Marie Pichotta, Maximilian P. Reitze, Philippe Schmitt‐Kopplin, Maria Schönbächler, Leon Thannheiser, Iris Weber, Alexander Wieser, Karl Wimmer   +25 more
wiley   +1 more source

1000–10,000 M⊙ Primordial Stars Created the Nitrogen Excess in GS 3073 at z = 5.55

The Astrophysical Journal Letters
The advent of the James Webb Space Telescope has revealed a wealth of new galaxies just a few hundred Myr after the Big Bang, a few of which exhibit unusual N/O ratios that are difficult to explain with stellar populations today.
Devesh Nandal, Daniel J. Whalen, Muhammad A. Latif, Alexander Heger   +3 more
doaj   +1 more source

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

Nuclear Activity in the Low-metallicity Dwarf Galaxy SDSS J0944-0038 : A Glimpse into the Primordial Universe

The Astrophysical Journal Letters, 2023
Local low-metallicity dwarf galaxies are relics of the early universe and are thought to hold clues into the origins of supermassive black holes. While recent studies are uncovering a growing population of active galactic nuclei (AGNs) in dwarf galaxies,
Michael Reefe, Shobita Satyapal, Remington O. Sexton, Nathan J. Secrest, William Matzko, Emma Schwartzman, Kristina Nyland, Gabriela Canalizo, Barry Rothberg, Ryan W. Pfeifle, Jenna M. Cann, Archana Aravindan, Camilo Vazquez, Tracy Clarke   +13 more
doaj   +1 more source

Where are the Fossils of the First Galaxies? II. True Fossils, Ghost Halos, and the Missing Bright Satellites

, 2011
We use a new set of cold dark matter simulations of the local universe to investigate the distribution of fossils of primordial dwarf galaxies within, and around the Milky Way.
Abazajian, Barkana, Belokurov, Belokurov, Bovill, Bovill, Bozek, Brown, Brown, Brown, Bullock, Bullock, Ciardi, de Jong, Efstathiou, Frebel, Geha, Haiman, Irwin, Karachentsev, Karachentsev, Klypin, Knollmann, Koposov, Machacek, Maio, Martinez, Massimo Ricotti, McGaugh, McGaugh, Mia S. Bovill, Monelli, Moore, Naab, Norris, O’Shea, Peebles, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Sand, Simon, Simon, Smith, Tinker, Tollerud, Trenti, Tully, Venkatesan, Walker, Walker, Walsh, Walsh, Whalen, Willman, Willman, Willman, Wise, Wise, Zentner, Zucker, Zucker   +64 more
core   +1 more source

Gravitational waves from primordial black holes and new weak scale phenomena

Physics Letters B, 2017
We entertain the possibility that primordial black holes of mass ∼(1026–1029) g, with Schwarzschild radii of O(cm), constitute ∼10% or more of cosmic dark matter, as allowed by various constraints.
Hooman Davoudiasl, Pier Paolo Giardino
doaj   +1 more source

Star formation in disk galaxies driven by primordial H_2

, 1997
We show that gaseous \HI disks of primordial composition irradiated by an external radiation field can develop a multiphase medium with temperatures between 10^2 and 10^4 K due to the formation of molecular hydrogen.
Abgrall H., Babul A., Daniele Galli, de Blok W. J. G., de Jong T., Edvige Corbelli, Efstathiou G., Flower D. R., Francesco Palla, Haiman Z., Kauffmann G., Seaton M. F., Wishart A. W.   +12 more
core   +1 more source