Results 11 to 20 of about 276,793 (392)

Cosmological Deuterium Production in Non-Standard Scenarios [PDF]

, 2002
It is widely believed that the cosmic baryon density may be obtained by inferring deuterium abundances in low-metallicity quasar absorption line systems. The implicit assumptions which enter this argument are critically assessed. In particular, the production of deuterium in non-standard Big Bang nucleosynthesis scenarios, the putative production of ...
Audouze, Bonifacio, Burles, Cayrel, Dolgov, Epstein, Famiano, Fujimoto, Fuller, Gnedin, Hansen, Holtmann, Hu, Jedamzik, Jedamzik, Jedamzik, Jedamzik, Kang, Karsten Jedamzik, Kurki-Suonio, Kurki-Suonio, Lindley, Malaney, Marigo, O'Meara, Protheroe, Ryan, Sarkar, Sigl, Webb, Woosley   +30 more
arxiv   +4 more sources

The Deuterium-Burning Mass Limit for Brown Dwarfs and Giant Planets [PDF]

, 2010
There is no universally acknowledged criterion to distinguish brown dwarfs from planets. Numerous studies have used or suggested a definition based on an object's mass, taking the ~13-Jupiter mass (M_J) limit for the ignition of deuterium. Here, we investigate various deuterium-burning masses for a range of models.
Adam Burrows, Adelberger, Bakos, Barman, Boss, Burrows, Burrows, Burrows, Burrows, Burrows, Chabrier, Chabrier, Chabrier, Cyburt, David S. Spiegel, Guillot, Guillot, Hubeny, John A. Milsom, Lewis, Madhusudhan, Marcy, Marley, Mihalas, Prodanović, Sahrling, Saumon, Sharp, Spergel, Spiegel   +29 more
arxiv   +3 more sources

On the deuterium abundance and the importance of stellar mass loss in the interstellar and intergalactic medium [PDF]

MNRAS, 2018, Volume 477, Issue 1, p.80-92, 2017
We quantify the gas-phase abundance of deuterium and fractional contribution of stellar mass loss to the gas in cosmological zoom-in simulations from the Feedback In Realistic Environments project. At low metallicity, our simulations confirm that the deuterium abundance is very close to the primordial value.
Chan, T. K., Faucher-Giguère, Claude-André, Feldmann, Robert, Hafen, Zachary, Hopkins, Philip F., Kereš, Dušan, Quataert, Eliot, van de Voort, Freeke   +7 more
arxiv   +9 more sources

Evolution of dispersion in the cosmic deuterium abundance [PDF]

, 2016
Deuterium is created during Big Bang Nucleosynthesis, and, in contrast to the other light stable nuclei, can only be destroyed thereafter by fusion in stellar interiors. In this paper we study the cosmic evolution of the deuterium abundance in the interstellar medium and its dispersion using realistic galaxy evolution models.
Dvorkin, Irina, Olive, Keith A., Petitjean, Patrick, Silk, Joseph, Vangioni, Elisabeth   +4 more
arxiv   +5 more sources

Probing the effectiveness: chiral perturbation theory calculations of low-energy electromagnetic reactions on deuterium [PDF]

AIP Conf.Proc. 603 (2001) 149-160, 2001
I summarize three recent calculations of electromagnetic reactions on deuterium in chiral perturbation theory. All of these calculations were carried out to O(Q^4), i.e. next-to-next-to-leading order. The reactions discussed here are: elastic electron-deuteron scattering, Compton scattering on deuterium, and the photoproduction of neutral pions from ...
Phillips, Daniel
arxiv   +5 more sources

Tracking The Post-BBN Evolution Of Deuterium [PDF]

, 2009
The primordial abundance of deuterium produced during Big Bang Nucleosynthesis (BBN) depends sensitively on the universal ratio of baryons to photons, an important cosmological parameter probed independently by the Cosmic Microwave Background (CMB) radiation.
Gary Steigman, George Sonneborn, H. Warren Moos, Michael E. Van Steenberg, William P. Blair   +4 more
arxiv   +5 more sources

Comment on "Deuterium--tritium fusion reactors without external fusion breeding" by Eliezer et al [PDF]

Published in Phys. Lett. A, Vol. 253 (1999) 119-121, 2002
Inclusion of inverse Compton effects in the calculation of deuterium-deuterium burn under the extreme conditions considered by Eliezer et al. [Phys. Lett. A 243 (1998) 298] are shown to decrease the maximum burn temperature from about 300 keV to only 100--150 keV.
A. Gsponer, Eliezer, Fraley, Gsponer, J.-P. Hurni, Kirkpatrick, Martinez-Val, Tahir, Weymann, Zel'dovich   +9 more
arxiv   +3 more sources

Cosmic Deuterium Or A Hydrogen Interloper ? [PDF]

, 1994
Two groups have independently reported the possible detection of extragalactic deuterium in the absorption spectrum of the same high redshift, low metalicity QSO. Although the high value for the inferred deuterium abundance poses no problems for cosmology (i.e., big bang nucleosynthesis), it is in apparent conflict with solar system observations of ...
Steigman, Gary
arxiv   +4 more sources

Deuterium-burning in substellar objects [PDF]

, 2000
We consider the depletion of primordial deuterium in the interior of substellar objects as a function of mass, age and absolute magnitude in several photometric passbands. We characterize potential spectroscopic signatures of deuterium in the lines of deuterated water HDO. These results will serve as a useful, independent diagnostic to characterize the
Baraffe I., Baraffe I., Basri G., Chabrier G., F. Allard, G. Chabrier, I. Baraffe, P. Hauschildt, Salpeter E. E., Schatzman E.   +9 more
arxiv   +6 more sources

The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium

Nuclear Fusion, 2023
Abstract The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with the ITER-like Be/W wall. The development started in pure Deuterium with refinement of the plasma current, and toroidal magnetic field choices and succeeded in solving ...
Hobirk J., Challis C.D., Kappatou A., Lerche E., Keeling D., King D., Aleiferis S., Alessi E., Angioni C., Auriemma F., Baruzzo M., Belonohy E., Bernardo J., Boboc A., Carvalho I.S., Carvalho P., Casson F.J., Chomiczewska A., Citrin J., Coffey I.H., Conway N.J., Douai D., Delabie E., Eriksson B., Eriksson J., Ficker O., Field A.R., Fontana M., Fontdecaba J.M., Frassinetti L., Frigione D., Gallart D., Garcia J., Gelfusa M., Ghani Z., Giacomelli L., Giovannozzi E., Giroud C., Goniche M., Gromelski W., Hacquin S., Ham C., Hawkes N.C., Henriques R.B., Hillesheim J.C., Ho A.1, Horvath L., Ivanova-Stanik I., Jacquet P., Jaulmes F., Joffrin E.1, Kim H.T, Kiptily V., Kirov K., Kos D., Kowalska-Strzeciwilk E., Kumpulainen H., Lawson K., Lennholm M., Litaudon X., Litherland-Smith E., Lomas P.J., de la Luna E., Maggi C.F., Mailloux J., Mantsinen M.J., Maslov M., Matthews G., McClements K.G., Meigs A.G., Menmuir S., Milocco A., Miron I.G., Moradi S., Morales R.B., Nowak S., Orsitto F., Patel A., Piron L., Prince C., Pucella G., Peluso E., Perez von Thun C., Rachlew E., Reux C., Rimini F., Saarelma S., Schneider A., Scully S., Sertoli M., Sharapov S., Shaw A., Silburn S., Sips A., Siren P., Sozzi C., Solano E.R., Stancar Z., Stankunas G., Stuart C., Sun H.J., Szepesi G., Valcarcel D., Valisa M., Verdoolaege G., Viola B., WendlerN., M. Zerbini M., JET Contributors   +108 more
openaire   +9 more sources