Anisotropy vs chemical composition at ultra-high energies (2009)
This paper proposes and discusses a test of the chemical composition of ultra-high energy cosmic rays that relies on the anisotropy patterns measured as a function of energy. In particular, we show...
On electromagnetic instabilities at ultra-relativistic shock waves (2009)
Lemoine, Martin, Pelletier, Guy
(Abridged) This paper addresses the issue of magnetic field generation in a relativistic shock precursor through micro-instabilities. The level of magnetization of the upstream plasma turns out to be...
Lemoine, Martin, Martin, Jerome, Yokoyama, Jun'ichi
We set constraints on moduli cosmology from the production of dark matter -- radiation and baryon -- radiation isocurvature fluctuations through modulus decay, assuming the modulus remains light...
The moduli problem at the perturbative level (2009)
Lemoine, Martin, Martin, Jerome, Yokoyama, Jun'ichi
Moduli fields generically produce strong dark matter -- radiation and baryon -- radiation isocurvature perturbations through their decay if they remain light during inflation. We show that existing...
Fermi Acceleration at relativistic Shocks (2008)
Pelletier, Guy, Lemoine, Martin, Marcowith, A.
After a successful development of theoretical and numerical works on Fermi acceleration at relativistic shocks, some difficulties recently raised with the scattering issue, a crucial aspect of the...
On Fermi acceleration and MHD-instabilities at ultra-relativistic magnetized shock waves (2008)
Pelletier, Guy, Lemoine, Martin, Marcowith, Alexandre
Fermi acceleration can take place at ultra-relativistic shock waves if the upstream or downstream magnetic field has been remodeled so that most of the magnetic power lies on short spatial scales....
Curvaton Decay into Baryons, anti-Baryons and Radiation (2008)
Lemoine, Martin, Martin, Jerome, Petit, Gregory
This paper calculates the amount of baryon/radiation isocurvature fluctuation produced through the decay of a curvaton field. It is shown in particular that if curvaton decay preserves baryon number...
Kotera, Kumiko, Lemoine, Martin
This paper provides an analytical description of the transport of ultrahigh energy cosmic rays in an inhomogeneously magnetized intergalactic medium. This latter is modeled as a collection of...
Fermi Acceleration at relativistic Shocks (2008)
Pelletier, Guy, Lemoine, Martin, Marcowith, A.
After a successful development of theoretical and numerical works on Fermi acceleration at relativistic shocks, some difficulties recently raised with the scattering issue, a crucial aspect of the...
Fermi Acceleration at relativistic Shocks (2008)
Pelletier, Guy, Lemoine, Martin, Marcowith, A.
After a successful development of theoretical and numerical works on Fermi acceleration at relativistic shocks, some difficulties recently raised with the scattering issue, a crucial aspect of the...
Fermi Acceleration at relativistic Shocks (2008)
Pelletier, Guy, Lemoine, Martin, Marcowith, A.
After a successful development of theoretical and numerical works on Fermi acceleration at relativistic shocks, some difficulties recently raised with the scattering issue, a crucial aspect of the...
Inhomogeneous extragalactic magnetic fields and the second knee in the cosmic ray spectrum (2007)
Kotera, Kumiko, Lemoine, Martin
Various experiments indicate the existence of a second knee around energy E=3.10^{17} eV in the cosmic ray spectrum. This feature could be the signature of the end of the galactic component and of...
Neutralino Dark Matter and the Curvaton (2006)
Lemoine, Martin, Martin, Jerome
We build a realistic model of curvaton cosmology, in which the energy content is described by radiation, WIMP dark matter and a curvaton component. We calculate the curvature and isocurvature...
On the efficiency of Fermi acceleration at relativistic shocks (2006)
Lemoine, Martin, Pelletier, Guy, Revenu, Benoit
It is shown that Fermi acceleration at an ultra-relativistic shock wave cannot operate on a particle for more than 1 1/2 Fermi cycle (i.e., u -> d -> u -> d) if the particle Larmor radius is much...
Pelletier, Guy, Lemoine, Martin, Marcowith, Alexandre
This paper investigates the nature of the MHD turbulence excited by the streaming of accelerated cosmic rays in a shock wave precursor. The two recognised regimes (non-resonant and resonant) of the...
Marcowith, Alexandre, Lemoine, Martin, Pelletier, Guy
Supernovae remnant shock waves could be at the origin of cosmic rays up to energies in excess of the knee ($E\simeq3\cdot 10^{15} $eV) if the magnetic field is efficiently amplified by the streaming...
Relativistic Fermi acceleration with shock compressed turbulence (2005)
Lemoine, Martin, Revenu, Benoit
This paper presents numerical simulations of test particle Fermi acceleration at relativistic shocks of Lorentz factor Gamma_sh = 2-60, using a realistic downstream magnetic structure obtained from...
Ultra-High Energy Heavy Nuclei Propagation in Extragalactic Magnetic Fields (2005)
Bertone, Gianfranco, Isola, Claudia, Lemoine, Martin, Sigl, Guenter
We extend existing work on the propagation of ultra-high energy cosmic rays in extragalactic magnetic fields to a possible component of heavy nuclei, taking into account photodisintegration, pion...
Gravitino, Axino, Kaluza-Klein Graviton Warm and Mixed Dark Matter and Reionisation (2005)
Jedamzik, Karsten, Lemoine, Martin, Moultaka, Gilbert
Stable particle dark matter may well originate during the decay of long-lived relic particles, as recently extensively examined in the cases of the axino, gravitino, and higher-dimensional...
Gravitino dark matter in gauge mediated supersymmetry breaking (2005)
Jedamzik, Karsten, Lemoine, Martin, Moultaka, Gilbert
This paper investigates the parameter space of theories with gauge mediated supersymmetry breaking leading to gravitino (cold) dark matter with mass m_{3/2}= 1keV - 10MeV. We pay particular attention...
Natural gravitino dark matter in SO(10) gauge mediated supersymmetry breaking (2005)
Lemoine, Martin, Moultaka, Gilbert, Jedamzik, Karsten
It is shown that gravitinos with mass m_{3/2} ~ 0.1-1 MeV may provide suitable cold dark matter candidates in scenarios of gauge mediated supersymmetry breaking (GMSB) under SO(10) grand unification...
Ultra-high energy cosmic ray propagation in the Universe (2005)
This paper summarizes recent developments in the study of the propagation of ultra-high energy cosmic ray protons or nuclei in the Universe, with emphasis on the consequences of energy losses and on...
Extra-galactic magnetic fields and the second knee in the cosmic-ray spectrum (2004)
Recent work suggests that the cosmic ray spectrum may be dominated by Galactic sources up to ~10^{17.5} eV, and by an extra-Galactic component beyond, provided this latter cuts off below the...
Trans-Planckian Dark Energy? (2002)
Lemoine, Martin, Martin, Jerome, Uzan, Jean-Philippe
It has recently been proposed by Mersini et al. 01, Bastero-Gil and Mersini 02 that the dark energy could be attributed to the cosmological properties of a scalar field with a non-standard dispersion...
Ultra-High Energy Heavy Nuclei Propagation in Extragalactic Magnetic Fields (2002)
Bertone, Gianfranco, Isola, Claudia, Lemoine, Martin, Sigl, Guenter
We extend existing work on the propagation of ultra-high energy cosmic rays in extragalactic magnetic fields to a possible component of heavy nuclei, taking into account photodisintegration, pion...
Ultra-High Energy Heavy Nuclei Propagation in Extragalactic Magnetic Fields (2002)
Bertone, Gianfranco, Isola, Claudia, Lemoine, Martin, Sigl, Guenter
We extend existing work on the propagation of ultra-high energy cosmic rays in extragalactic magnetic fields to a possible component of heavy nuclei, taking into account photodisintegration, pion...
Ultra-High Energy Heavy Nuclei Propagation in Extragalactic Magnetic Fields (2002)
Bertone, Gianfranco, Isola, Claudia, Lemoine, Martin, Sigl, Guenter
We extend existing work on the propagation of ultra-high energy cosmic rays in extragalactic magnetic fields to a possible component of heavy nuclei, taking into account photodisintegration, pion...
The stress-energy tensor for trans-Planckian cosmology (2001)
Lemoine, Martin, Lubo, Musongela, Martin, Jerome, Uzan, Jean-Philippe
This article presents the derivation of the stress-energy tensor of a free scalar field with a general non-linear dispersion relation in curved spacetime. This dispersion relation is used as a...
Transport of Cosmic Rays in Chaotic Magnetic Fields (2001)
Casse, Fabien, Lemoine, Martin, Pelletier, Guy
The transport of charged particles in disorganised magnetic fields is an important issue which concerns the propagation of cosmic rays of all energies in a variety of astrophysical environments, such...
Reheating and dangerous relics in pre-big bang string cosmology (2000)
Buonanno, Alessandra, Lemoine, Martin, Olive, Keith A.
We discuss the mechanism of reheating in pre-big bang string cosmology and we calculate the amount of moduli and gravitinos produced gravitationally and in scattering processes of the thermal bath....
Moduli constraints on primordial black holes (2000)
The amount of late decaying massive particles (e.g., gravitinos, moduli) produced in the evaporation of primordial black holes (PBHs) of mass $\Mbh\la10^9 $g is calculated. Limits imposed by big-bang...
Gravitational production of gravitinos (1999)
We calculate the number density of helicity $\pm3/2$ gravitinos produced out of the vacuum by the non-static gravitational field in a generic inflation scenario. We compare it to the number density...
Supercluster Magnetic Fields and Anisotropy of Cosmic Rays above 10**(19) eV (1999)
Lemoine, Martin, Sigl, Guenter, Biermann, Peter
We predict energy spectra and angular distributions of nucleons above 10**(19) eV that originate from sources distributed in the Local Supercluster, which is also supposed to contain a large scale...
Ultra-High Energy Cosmic Ray Propagation in the Local Supercluster (1998)
Sigl, Guenter, Lemoine, Martin, Biermann, Peter
We present detailed numerical simulations and analytical approximations of the propagation of nucleons above 10**(19) eV in the Local Supercluster, assuming that the ambient magnetic field is...
Sigl, Guenter, Lemoine, Martin
We present a detailed Monte Carlo study coupled to a likelihood analysis of the potential of next generation ultra-high energy cosmic ray experiments to reconstruct properties of the sources and the...
Ultra-high energy cosmic ray sources and large scale magnetic fields (1997)
Lemoine, Martin, Sigl, Guenter, Olinto, Angela V., Schramm, David N.
Protons of energies up to 10**20 eV can be subject to significant deflection and energy dependent time delay in lage scale extragalactic or halo magnetic fields of strengths comparable to current...
Maximum Likelihood Analysis of Clusters of Ultra-High Energy Cosmic Rays (1997)
Sigl, Guenter, Lemoine, Martin, Olinto, Angela V.
We present a numerical code designed to conduct a likelihood analysis for clusters of nucleons above 10**19 eV originating from discrete astrophysical sources such as powerful radio galaxies,...
A very reduced upper limit on the interstellar abundance of beryllium (1997)
Hébrard, Guillaume, Lemoine, Martin, Ferlet, Roger, Vidal-Madjar, Alfred
We present the results of observations of the $\lambda 3130.4$ \AA interstellar absorption line of Be II in the direction of zeta Per. The data were obtained at the Canada-France-Hawaii 3.6m...
Nuclear Reaction Rates and Primordial $^6$Li (1996)
Nollett, Kenneth M., Lemoine, Martin, Schramm, David N.
We examine the possibility that Big Bang Nucleosynthesis (BBN) may produce non-trivial amounts of $^6$Li. If a primordial component of this isotope could be observed, it would provide a new...
The Interstellar $^7$Li/$^6$Li Ratio (1994)
Lemoine, Martin, Ferlet, Roger
We discuss the observational status of the interstellar lithium isotopic ratio and its significance with respect to the galactic evolution of lithium.