Results 31 to 40 of about 21,756 (168)

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

Holography and Brane-bulk Energy Exchange

, 2005
The five-dimensional description of generalized Randall-Sundrum cosmology is mapped via holography to a generalization of the Starobinsky model. This provides a holographic dual description of the cosmological brane-bulk energy exchange processes studied
Alexander S H S, Apostolopoulos P S, Apostolopoulos P S Brouzakis N Saridakis E N Tetradis N, Arkani-Hamed N, Banks T Douglas M R Horowitz G T Martinec E J, Bianchi M, Bianchi M, Birrell N D, Brandhuber A, Brax P, Brax P van de Bruck C Davis A C, Burgess C P, Charmousis C, Csaki C, Danielsson U H, Das S R, de Haro S, Duff M J, Dvali G R Shafi Q Solganik S, Elias Kiritsis, Fefferman C, Freedman D Z, Gabadadze G, Gregory J P, Henningson M, Kehagias A, Kiritsis E, Kiritsis E, Kiritsis E, Kiritsis E, Kiritsis E, Klebanov I R, Kraus P, Leeper E, Maartens R, Maldacena J, Maldacena J M, Nojiri S, Papadimitriou I, Papadimitriou I Skenderis K, Quevedo F, Silverstein E, Sundrum R, Tetradis N, Tomaras T N, Trodden M Carroll S M, Verlinde H, Witten E, Witten E, Zee A, ’t Hooft G   +50 more
core   +2 more sources

Polynomial $f(R)$ Palatini cosmology -- dynamical system approach

, 2017
We investigate cosmological dynamics based on $f(R)$ gravity in the Palatini formulation. In this study we use the dynamical system methods. We show that the evolution of the Friedmann equation reduces to the form of the piece-wise smooth dynamical ...
Stachowski, Aleksander, Szydlowski, Marek   +1 more
core   +1 more source

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

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

Lonergan, Decolonization and First Nations Peoples: An Apologetic from an Insider on the Outside

Modern Theology, EarlyView.
Abstract The purpose of this article is to respond critically to a research project initiated out of the Board of the Lonergan Research Institute that seeks to expose colonialist assumptions in Lonergan's thought. Some of the initiatives seek to link Lonergan with complicity in Canadian residential schools, spiritual violence, and cultural genocide ...
John D. Dadosky
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

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

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