Results 1 to 10 of about 19,776 (118)

Stringy Effects During Inflation and Reheating [PDF]

, 2005
We consider inflationary cosmology in the context of string compactifications with multiple throats. In scenarios where the warping differs significantly between throats, string and Kaluza-Klein physics can generate potentially observable corrections to ...
A. Vilenkin, Andrew R. Frey, Anupam Mazumdar, B. J. Carr, E. Witten, E. W. Kolb, Robert C. Myers   +6 more
core   +3 more sources

Unification and Local Baryon Number

, 2017
We investigate the possibility to find an ultraviolet completion of the simple extensions of the Standard Model where baryon number is a local symmetry.
Ohmer, Sebastian, Perez, Pavel Fileviez
core   +4 more sources

Monochromatic Gamma Rays from Dark Matter Annihilation to Leptons [PDF]

, 2015
We investigate the relation between the annihilation of dark matter (DM) particles into lepton pairs and into 2-body final states including one or two photons.
Coogan, Adam, Profumo, Stefano, Shepherd, William   +2 more
core   +2 more sources

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

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

Cosmological constraints on deviations from Lorentz invariance in gravity and dark matter [PDF]

, 2014
We consider a scenario where local Lorentz invariance is violated by the existence of a preferred time direction at every space-time point. This scenario can arise in the context of quantum gravity and its description at low energies contains a unit time-
Audren, B., Blas, D., Ivanov, M. M., Lesgourgues, J., Sibiryakov, S.   +4 more
core   +3 more sources

Dark Matter from Minimal Flavor Violation

, 2011
We consider theories of flavored dark matter, in which the dark matter particle is part of a multiplet transforming nontrivially under the flavor group of the Standard Model in a manner consistent with the principle of Minimal Flavor Violation (MFV). MFV
A Adulpravitchai, A Belyaev, A Falkowski, A Katz, A Lenz, AI Vainshtein, AJ Buras, AJ Buras, AL Kagan, AV Manohar, B Batell, B Batell, B Bellazzini, B Grinstein, Brian Batell, C-R Chen, CP Burgess, CW Bauer, D Meloni, DE Soper, DL Rainwater, E Gross, E Komatsu, E Ma, E Nikolidakis, F Chen, F D’Eramo, G Bertone, G D’Ambrosio, G Jungman, GD Kribs, GD Kribs, J Alwall, J Gallicchio, J Goodman, J Goodman, J March-Russell, J McDonald, J-H Kim, JM Arnold, JM Arnold, JM Butterworth, JM Campbell, JM Campbell, Josef Pradler, JR Ellis, K Agashe, LJ Hall, M Bahr, M Beltrán, M Blennow, M Cacciari, M Cacciari, M Carena, M Cirelli, M Hirsch, M Lisanti, M Trott, MA Shifman, Michael Spannowsky, MS Boucenna, N Haba, N Kauer, P Sorensen, RS Chivukula, S Chang, S Chang, S Yellin, T Aaltonen, T Aaltonen, T Hambye, T Plehn, T Sjöstrand, TR Slatyer, V Cirigliano, V Silveira, VM Abazov, VM Abazov, Y Bai, Y Grossman, Y Kajiyama, Z Ligeti, Z Ligeti   +82 more
core   +1 more source

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

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

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