Results 31 to 40 of about 21,702 (168)

New Light Species and the CMB

, 2013
We consider the effects of new light species on the Cosmic Microwave Background. In the massless limit, these effects can be parameterized in terms of a single number, the relativistic degrees of freedom.
Brust, Christopher, Kaplan, David E., Walters, Matthew T.   +2 more
core   +1 more source

Do sewn singularities falsify the Palatini cosmology? [PDF]

, 2016
We investigate further (cf. arXiv:1512.01199, JCAP01 (2016) 040) Starobinsky cosmological model $R+\gamma R^2$ in the Palatini formalism with Chaplygin gas and baryonic matter as a source. For this aim we use dynamical system theory.
Borowiec, Andrzej, Stachowski, Aleksander, Szydlowski, Marek, Wojnar, Aneta   +3 more
core   +2 more sources

Cosmic abundances of SIMP dark matter

Journal of High Energy Physics, 2017
Thermal production of light dark matter with sub-GeV scale mass can be attributed to 3 → 2 self-annihilation processes. We consider the thermal average for annihilation cross sections of dark matter at 3 → 2 and general higher-order interactions.
Soo-Min Choi, Hyun Min Lee, Min-Seok Seo
doaj   +1 more source

What are the Building Blocks of Our Universe? [PDF]

, 2004
We are told that we are living in a Golden Age of Astronomy. Cosmological Parameters are found with un precedented accuracy. Yet, the known form of matter forms only a small fraction of the total energy density of the universe.
Wali, Kameshwar C.
core   +2 more sources

The unexpected resurgence of Weyl geometry in late 20-th century physics

, 2017
Weyl's original scale geometry of 1918 ("purely infinitesimal geometry") was withdrawn by its author from physical theorizing in the early 1920s. It had a comeback in the last third of the 20th century in different contexts: scalar tensor theories of ...
A Codello, A Trautman, A Trautman, A Zee, A Zee, A Zee, A. Einstein, A. Trautman, Alexander Bregman, ALI SHOJAI, Ali Shojai, ALI SHOJAI, Allan Franklin, Arianna Borrelli, B. Rievers, Bertram Kostant, C N Yang, C Romero, C. Brans, C. N. Yang, C. ROMERO, Carl Brans, Carl H. Brans, Carlos Castro, Carlos Castro, Carlos Castro, Chen‐Ning Yang, Claus Lämmerzahl, Curtis G Callan, D. J. Simms, David Bohm, David Bohm, David Kaiser, Dennis Lehmkuhl, Detlev Dürr, E. Santamato, E. Santamato, E. Santamato, E. Scholz, Enrico Santamato, Enrico Santamato, Erhard Scholz, Erhard Scholz, F. Dahia, F. Englert, F.W. Hehl, Fang-Fang Yuan, FATIMAH SHOJAI, FATIMAH SHOJAI, FATIMAH SHOJAI, FATIMAH SHOJAI, Francesco De Martini, Francesco De Martini, Francesco De Martini, Friedrich W Hehl, Friedrich W. Hehl, Friedrich W. Hehl, Friedrich W. Hehl, Gerald B. Folland, H P de Oliveira, H Weyl, H.T. Nieh, Helge Kragh, Helge S. Kragh, Herbert Pfister, Hermann Weyl, Hermann Weyl, Hitoshi Nishino, Hrvoje Nikolić, Hubert Goenner, Hung Cheng, J Audretsch, J M Salim, J. A. Schouten, J. Bekenstein, J. M. Charap, Jayant V. Narlikar, Jean-Marie Souriau, John Miritzis, JOHN MIRITZIS, John R. Ray, Jürgen Audretsch, Jürgen Audretsch, Jȩdrzej Śniatycki, K. Hayashi, Koray Karaca, Krzysztof A. Meissner, Lee Smolin, M-A Tonnelat, M. Flato, M. Kasuya, M. L. Pucheu, M. Novello, M. Novello, M. NOVELLO, M. Omote, M. Omote, Marek Pawlowski, Marek Pawłowski, Mark Israelit, Mark Israelit, Mark Israelit, Mark Israelit, Mark Israelit, Martina R. Schneider, Mikhail Shaposhnikov, Mikhail Shaposhnikov, Milutin Blagojević, Moshé Flato, N M J Woodhouse, Nathan Rosen, P. A. M. Dirac, P. A. M. Dirac, P. Bouvier, Peter Gilkey, Philip D. Mannheim, Philip D. Mannheim, Philip D. Mannheim, Philip D. Mannheim, R Utiyama, R Utiyama, R Utiyama, R Utiyama, R. H. Dicke, R. Penrose, Robert Alan Coleman, Robert Foot, S Deser, S Weinberg, Sidney Coleman, Spiros Cotsakis, Stephen L. Adler, T. Padmanabhan, T. W. B. Kibble, Timothy Clifton, V Perlick, V Vizgin, V. Canuto, V. M. Canuto, Volker Perlick, W R Wood, W. Drechsler, W. Drechsler, W. R. Wood, Wayne C. Myrvold, Wojciech Kopczyński, Wolfgang Drechsler, Yu.N. Obukhov, YUE-LIANG WU   +148 more
core   +1 more source

Gravitino dark matter in brane-world cosmology [PDF]

, 2007
The gravitino dark matter hypothesis in the brane cosmology is studied. The theoretical framework is the CMSSM for particle physics and RS II brane model for gravity.
Aliev A N, Brandenburg A, Brown R A, CDF Collaboration, Cerdeno D G, Covi L, Djouadi A Kneur J L Moultaka G, Edsjo J, Grigoris Panotopoulos, Heinemeyer S, Kiritsis E, Kiritsis E, Kofinas G, Panotopoulos G, Peccei R D, Pradler J Steffen F D, Roszkowski L, Spergel D N, Steffen F D   +18 more
core   +3 more sources

Characteristics of Natural Remanence Records in Fine‐Grained Particles Returned From Asteroid Ryugu

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract Particles collected from the asteroid Ryugu by the Hayabusa2 spacecraft offer a unique opportunity to investigate the magnetic record of the primitive solar system, as any terrestrial magnetic contamination is minimal and can be accounted for.
Masahiko Sato, Yuki Kimura, Tadahiro Hatakeyama, Tomoki Nakamura, Satoshi Okuzumi, Sei‐ichiro Watanabe, Seiji Sugita, Satoshi Tanaka, Shogo Tachibana, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Yuichi Tsuda   +27 more
wiley   +1 more source

Conformal transformations and Nordstr\"om's scalar theory of gravity

, 2010
As we shall briefly recall, Nordstr\"om's theory of gravity is observationally ruled out. It is however an interesting example of non-minimal coupling of matter to gravity and of the role of conformal transformations.
Deruelle, Nathalie, Sasaki, Misao
core   +1 more source

Tracing a Wet Past and Diverse Provenances in Gale Crater, Mars, With Lithium Content Using ChemCam on the Curiosity Rover

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract The incompatible behavior of Lithium during magmatic differentiation and high mobility during aqueous alteration make it a valuable tracer of crustal processes on Mars. Its preferential incorporation into secondary phyllosilicates further links Li to clay‐forming environments, which are critical for evaluating past aqueous activity and ...
K. W. Nikolajsen, J. Frydenvang, E. Dehouck, R. C. Wiens, P. J. Gasda, L. Le Deit, G. Caravaca, C. C. Bedford, A. Ollila, A. Cousin, S. Maurice, O. Gasnault, N. L. Lanza   +12 more
wiley   +1 more source

Relaxion fluctuations (self-stopping relaxion) and overview of relaxion stopping mechanisms

Journal of High Energy Physics, 2020
In implementations of the electroweak scale cosmological relaxation mechanism proposed so far, the effect of the quantum fluctuations of the homogeneous relaxion field has been ignored.
Nayara Fonseca, Enrico Morgante, Ryosuke Sato, Géraldine Servant   +3 more
doaj   +1 more source