Results 71 to 80 of about 8,556 (157)

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

Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition

, 2012
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes of pitch angle of spiral galaxies have been almost ...
Barden, Barger, Benjamin L. Davis, Claud H. S. Lacy, Considere, Daniel Kennefick, Davis, de Vaucouleurs, Douglas W. Shields, Eskridge, Ferrarese, Gebhardt, Gebhardt, Graham, Grosbol, Herschel, Ho, Häring, Ivânio Puerari, Jedrzejewski, Joel C. Berrier, Julia Kennefick, Kormendy, Ma, Magorrian, Marc S. Seigar, Marconi, Martínez-García, Press, Puerari, Puerari, Saraiva Schroeder, Seiden, Seigar, Seigar, Sérsic, Thornley, Tody, Vestergaard   +38 more
core   +1 more source

A direct test of density wave theory in a grand-design spiral galaxy

, 2019
The exact nature of the arms of spiral galaxies is still an open question1. It has been widely assumed that spiral arms in galaxies with two distinct symmetrical arms are the products of density waves that propagate around the disk, with the spiral arms being visibly enhanced by the star formation that is triggered as the passing wave compresses gas in
Peterken, Thomas G., Merrifield, Michael R., Drory, Niv, Krawczyk, Coleman M., Masters, Karen L., Weijmans, Anne-Marie, Westfall, Kyle B.   +6 more
openaire   +1 more source

The lifetime of grand design [PDF]

, 2005
The lifetime of the structure in grand design spiral galaxies is observationally ill-determined, but is essentially set by how accurately the rotation of the pattern can be characterized by a single angular pattern speed. This paper derives a generalized
M. Merrifield, R. Rand, S. Meidt
semanticscholar   +1 more source

Substituent‐Based Modulation of Self‐Assembly and Immunogenicity of Amphipathic Peptides

Advanced Science, Volume 13, Issue 18, 27 March 2026.
This study systematically investigates how positional and subtle changes, such as substituents on the phenyl ring attached to short amphipathic peptides, influence their self‐assembly, fibril morphology, and immunogenic responses. ABSTRACT Self‐assembled peptide‐based biomaterials provide versatile platforms for biomedical uses, featuring customizable ...
Anirban Das, Ushasi Pramanik, Elise M. Brown, Chih‐Yun Liu, Huan Gong, Jonathan Fascetti, Mark Gibson, Samuel Stealey, Silviya P. Zustiak, Cory Berkland, Piyoosh Sharma, Meredith E. Jackrel, Mark A. White, Jai S. Rudra   +13 more
wiley   +1 more source

Role of gas in supporting grand spiral structure

, 2015
The density wave theory for the grand-design two-armed spiral pattern in galaxies is successful in explaining several observed features. However, the long-term persistence of this spiral structure is a serious problem since the group transport would ...
Ghosh, Soumavo, Jog, Chanda J.
core   +1 more source

Clinical Application of Peripheral Blood Biomarkers for Solid Tumors

MedComm, Volume 7, Issue 3, March 2026.
Peripheral blood biomarkers provide a minimally invasive, dynamic, and potentially more accurate means to obtain a comprehensive tumor profile. Technologies for detecting them are advancing, and with the help of artificial intelligence, they are being used more and more often for cancer diagnosis, prognostic assessment, and therapeutic monitoring ...
Xinru Tu, Mengyan Tu, Junfen Xu
wiley   +1 more source

Using synthetic emission maps to constrain the structure of the Milky Way

, 2013
We present the current standing of an investigation into the structure of the Milky Way. We use smoothed particle hydrodynamics (SPH) to simulate the ISM gas in the Milky Way under the effect of a number of different gravitational potentials representing
Acreman, David, Dobbs, Clare, Pettitt, Alex, Price, Daniel   +3 more
core   +1 more source

Facile Bottom‐Up Assembly of Photonic Micropatterns via Surface‐Guided Colloidal Crystallization

Advanced Materials, Volume 38, Issue 7, 2 February 2026.
High‐resolution photonic micropatterns with vivid structural colors are fabricated through bottom‐up assembly, guided by surface‐dependent regioselective heterogeneous nucleation and crystal growth of colloidal particles. Full‐spectrum color tunability is achieved by controlling particle size and interparticle attraction, while in situ color mixing is ...
Yongseok Jung, Sehee Yang, Sanghyuk Park, Shin‐Hyun Kim   +3 more
wiley   +1 more source

A Turbulent Origin for Flocculent Spiral Structure in Galaxies

, 2003
The flocculent structure of star formation in 7 galaxies has a Fourier transform power spectrum for azimuthal intensity scans with a power law slope that increases systematically from -1 at large scales to -1.7 at small scales.
Athanassoula E., Battinelli P., Block D. L., Boldyrev S., Bruce G. Elmegreen, Crovisier J., Debra Meloy Elmegreen, Elmegreen D. M., Feitzinger J. V., Feitzinger J. V., Green D. A., Huber D., Kuno N., Larson R. B., MacLow M.-M., Puerari I., Samuel N. Leitner, Semelin B., Stutzki J., Thomasson M., Zielinsky M.   +20 more
core   +2 more sources