Journées Théorie PNHE

Liste des Contributions

12. Introduction

Guillaume Dubus (IPAG), Susanna Vergani (CNRS-Observatoire de Paris)

01/10/2018 10:30

13. Le trou noir central de la Galaxie

Frédéric Vincent

01/10/2018 10:40

14. Exploring black hole spacetimes with SageManifolds

Eric Gourgoulhon (LUTH, Observatoire de Paris)

01/10/2018 11:10

15. Quels mécanismes transportent la matière dans les disques d'accrétion ?

Jean-Pierre Lasota

01/10/2018 11:30

6. A unified accretion ejection paradigm for X-ray binaries

Grégoire Marcel (Institut de Planétologie et d'Astrophysique de Grenoble)

01/10/2018 12:00

The hysteresis behavior of X-ray binaries during their outbursts remains a mystery. In this work, we developed the paradigm proposed in Ferreira et al (2006) where the disk material accretes in two possible, mutually exclusive, ways. In the Standard Accretion Disk (hereafter SAD) mode, the dominant local torque is due to MHD turbulence that transports radially the disk angular momentum. In the...

5. Transport de moment cinétique dans les novae naines

Nicolas Scepi (IPAG CNRS)

01/10/2018 12:20

Les novae naines sont des binaires compactes composées d'une étoile de type solaire et d'une naine blanche entourée d'un disque d'accrétion oscillant entre un état quiescent et un état éruptif. Les temps caractéristiques sur lesquels la luminosité du disque évolue permettent d'obtenir des contraintes sur la valeur de $\alpha$, rapport du stress turbulent responsable du transport de moment...

18. Turbulence et dynamo dans les noyaux actifs de galaxies

Antoine Riols-Fonclare (IPAG)

01/10/2018 12:40

20. Dark matter searches with gamma rays

Francesca Calore (LAPTh, CNRS)

01/10/2018 14:15

3. Small-scale structuring of Galactic dark matter and impact on indirect searches

Martin Stref (LUPM)

01/10/2018 14:45

Cold dark matter is known to structure on scales much smaller than typical galaxies. This structuring translates into a large population of subhalos in galactic halos that impact indirect dark matter searches by boosting the annihilation signal (gamma rays, antimatter cosmic rays). I will present the first model of the Galactic subhalo population fully consistent with dynamical constraints....

22. Voyager probing dark matter

Mathieu Boudaud (LPTHE)

01/10/2018 15:05

23. Quo Vadis, Materia Nigra?

Pasquale Dario Serpico (LAPTh, Annecy-le-vieux)

01/10/2018 15:25

34. Explosions extrêmes : hypernovae, sursauts gamma, supernovae superlumineuses

Jérôme Guilet (Max-Planck Institut fuer Astrophysik (Garching))

01/10/2018 16:25

28. Transport des rayons cosmiques dans la Galaxie

Stefano Gabici (DIAS, Dublin)

01/10/2018 16:55

4. Recent results with the USINE and CLUMPY codes

David Maurin (LPSC)

01/10/2018 17:25

[USINE][1] is a public code for Galactic Cosmic Ray propagation (first public release is V3.4, [arXiv:1807.02968][2]). This code can be used to interpret AMS-02 data, and I will show one example of its use ([arXiv:1803.04686][3]). [CLUMPY][4] is a public code for dark matter searches in the gamma-ray and neutrino channels (third release V3, [arXiv:1806.08639][5]). I will show one recent...

27. On the origin and composition of Galactic cosmic rays

Nikos Prantzos (IAP Paris)

01/10/2018 18:05

29. Numerical Observatory of Violent Accreting systems (NOVAs): a general relativistic tool to put GR(M)HD simulations to the test of high-energy observations

Fabien CASSE (AstroParticule & cosmologie)

02/10/2018 09:00

30. Rotation and magnetic field effects on the stability of two-component jets

Zakaria Meliani

02/10/2018 09:30

31. Comptonisation et création de paires près de l'horizon d'un trou noir

Philippe Laurent (CEA/SAp & APC)

02/10/2018 09:50

32. L'équation d'état de la matière nucléaire

Micaela Oertel (LUTH, Observatoire de Paris)

02/10/2018 10:10

8. Neutron stars: macroscopic objects with quantum properties

Jérôme Pétri (Observatoire astronomique de Strasbourg)

02/10/2018 11:10

Within the last few years, the physics of compact objects has greatly benefited from terrestrial based and space telescopes. Among them, neutron stars predicted to be end products of stellar evolution remain badly understood. Moreover, pulsars form a peculiar class of neutron stars which emission remains enigmatic although discovered 50 years ago.

Magnetized neutron stars harbour...

33. Modélisation numérique des étoiles à neutrons: vers une meilleure description physique

Jérôme Novak

02/10/2018 11:30

9. Dark Matter Accretion in Neutron Stars

Yoann GÉNOLINI (LAPTh)

02/10/2018 11:50

If DM interacts with nucleons and/or electrons it can be trapped by astrophysical objects such as the Sun or neutron stars. Elastic scattering of a DM particle with ordinary matter can in particular reduce the kinetic energy of the DM particle when it passes through these stars, such that its speed passes below the corresponding escape velocity. Once gravitationally trapped, DM undergoes...

2. Probing dark matter around black holes at the centers of galaxies

Dr Thomas Lacroix (Laboratoire Univers & Particules de Montpellier)

02/10/2018 12:10

The dark matter (DM) distribution in the central regions of galaxies remains poorly constrained at present. In particular, DM density profiles may be significantly affected by the presence of central black holes, leading to the possible formation of density spikes. I will discuss different avenues that can shed light on the characteristics of the DM distribution in the cores of galaxies. On...

35. Modélisation physique des sursauts gamma

Frédéric Daigne (Institut d'Astrophysique de Paris - Université Pierre et Marie Curie)

02/10/2018 12:30

36. Accélération de particules au voisinage des magnétosphères relativistes

Benoît Cerutti (Institut de Planétologie et d'Astrophysique de Grenoble / Université Grenoble Alpes)

02/10/2018 14:15

10. The influence of pair production upstream of relativistic collisionless shocks

Arno Vanthieghem (IAP)

02/10/2018 14:45

Among other powerful relativistic astrophysical objects, gamma-ray bursts, blazars and pulsar winds provide an ideal environment to understand the acceleration mechanisms of high-energy charged particles. The radiative spectra observed in such objects are generally attributed to particles energized in relativistic collisionless shock waves. In this presentation, we investigate the backreaction...

37. G4BetheHeitler5DModel: un générateur d'événements gamma -> e+e-

Denis Bernard (LLR, Ecole Polytechnique, CNRS/IN2P3)

02/10/2018 15:05

38. Precision big bang nucleosynthesis with improved Helium-4 predictions

Cyril Pitrou

02/10/2018 15:25

39. Perspectives théoriques pour l'astrophysique des ondes gravitationnelles

Alexandre Le Tiec (Observatoire de Paris)

02/10/2018 16:15

40. A high-energy electromagnetic precursor to binary neutron star mergers?

Benjamin Crinquand

02/10/2018 16:45

7. Ultra-high energy neutrinos from neutron-star mergers / Neutrinos de ultra-haute energie des fusions d’étoiles à neutrons

Valentin Decoene (Institut d'Astrophysique de Paris)

02/10/2018 17:05

English version :

In the context of the recent multi-messenger observation of neutron-star merger GW170817, we examine whether such objects could be sources of ultra-high energy astroparticles. At first order, the energetics and the population number is promising to envisage the production of a copious amount of high-energy particles, during the first minutes to weeks from the merger. In...