Results 81 to 90 of about 605,159 (270)
The Astrophysical JournalThe morphology of ionized gas velocity maps provides a direct probe of the internal gas kinematics of galaxies. Using integral field spectroscopy from SDSS-IV MaNGA, we analyze a sample of 528 low-inclination, regular disk galaxies to investigate the ...
Shuai Feng +7 more
doaj +1 more source
Autoparallels and the Inverse Problem of the Calculus of Variations
Fortschritte der Physik, Volume 74, Issue 5, May 2026.ABSTRACT We prove that autoparallel curves associated with a torsion‐free but not necessarily metric‐compatible affine connection can be derived from an action principle. We explicitly construct the action functional and show by standard variational techniques that it produces the desired equations.
Lavinia Heisenberg
wiley +1 more source
Constraining dark energy using real and mock galaxy surveys [PDF]
, 2009 In this thesis, we study how dark energy may be constrained by measurements of large-scale clustering in future galaxy surveys, and through the imprint of a time-varying large-scale potential on the CMB (the integrated Sachs-Wolfe effect).
CAI, YANCHUAN
core
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
The nature and origin of disky elliptical galaxies [PDF]
, 2002 The observational trend that disky elliptical galaxies exhibit younger luminosity- weighted ages than boxy ellipticals is investigated. The presence of a possible young stellar disk embedded in these galaxies is explored by comparing kinematics derived ...
McDermid, Richard Morgan
core
The Large-scale Structure Supplies the Formation of Gas-star Misaligned Galaxies
The Astrophysical Journal LettersUsing the integral field unit data from the Mapping Nearby Galaxies at Apache Point Observatory survey, we build a sample of gas-star misaligned galaxies. The large-scale environment of misaligned galaxies is dominated by filaments and clusters, while it
Min Bao +5 more
doaj +1 more source
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
High-Redshift Galaxy Kinematics: Constraints on Models of Disk Formation [PDF]
, 2008 Integral field spectroscopy of galaxies at redshift z ∼ 2 has revealed a population of early-forming, rotationally supported disks. These high-redshift systems provide a potentially important clue to the formation processes that build disk galaxies in ...
B. Robertson, J. Bullock
semanticscholar +1 more source
Properties of Galaxies with Counter-rotating Stellar Disks in the MaNGA Survey
The Astrophysical JournalThe gas accretion process can fuel both star formation and black hole activity, playing a critical role in galaxy evolution. The counter-rotating structures are believed to originate from gas accretion, serving as an ideal laboratory to study its impact ...
Min Bao +4 more
doaj +1 more source
Edible Pneumatic Battery for Sustained and Repeated Robot Actuation
Advanced Science, Volume 13, Issue 15, 13 March 2026.This work presents an edible energy source and valve system to power soft, pneumatically driven edible robots. A chemical reaction between sodium bicarbonate and citric acid generates carbon dioxide gas, and a pressure‐triggered edible valve enables self‐repetitive motion of the edible actuator.
Bokeon Kwak +5 more
wiley +1 more source