# Space Plasma Instabilities Resolve GeV-TeV Tension and Constrain Light Axions

- Institution: CERN
- Department: Eucapt Conferences
- Speaker: Oindrila Ghosh
- Year: 2023
- Language: English
- Subjects: Astronomy and space
- Source: [CERN](https://videos.cern.ch/record/3005146)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

TeV blazars dominate the extragalactic gamma-ray sky and highly energetic pair beams arising from such blazar jets underproduce gamma rays in the GeV band while inverse-Compton scattering off the cosmic microwave background. Recent Fermi-LAT isotropic gamma-ray background measurements suggest that space plasma instabilities can play a crucial role in alleviating this GeV-TeV tension by transferring energy from the active galactic nucleus into the intergalactic medium. A direct consequence of such instability losses is the modification of thermal history and suppression of power at late times, potentially holding a clue towards resolving the small-scale crisis in cosmology. We show that the observation of dwarf galaxies and Lyman-alpha measurements can narrow down the mass range for light axion-like particles in a blazar-heated universe..

0:00:00 Slide 1

0:00:16 Slide 2

0:00:31 Slide 3

0:00:47 Slide 4

0:01:02 Slide 5

0:01:18 Slide 6

0:01:33 Slide 7

0:01:49 Slide 8

0:02:04 Slide 9

0:02:19 Slide 10

0:02:35 Slide 11

0:02:50 Slide 12

0:03:06 Slide 13

0:03:21 Slide 14

0:03:37 Slide 15

0:03:52 Slide 16

0:04:07 Slide 17

0:04:23 Slide 18

0:04:38 Slide 19

0:04:54 Slide 20

0:05:09 Slide 21

0:05:25 Slide 22

0:05:40 Slide 23

0:05:55 Slide 24

0:06:11 Slide 25

0:06:26 Slide 26

0:06:42 Slide 27

0:06:57 Slide 28

0:07:13 Slide 29

0:07:28 Slide 30

## Lectures

1. [Space Plasma Instabilities Resolve GeV-TeV Tension and Constrain Light Axions](https://invisiblenetwork.ai/learn/cern/3005146/f4f8f8c7cccf), 8 min (CERN's player)