<｜begin▁of▁sentence｜>### Instruction:
Given the Astrophysics collaborations graph that can be read from a GML file named 'astro-ph.gml', how can you use the rb_pots function in cdlib to perform community detection, and then convert the resulting NodeClustering object into a JSON format?
### Response:
import networkx as nx
from cdlib import algorithms

# Load the astrophysics collaborations graph
G = nx.read_gml('astro-ph.gml')

# Apply the rb_pots community detection algorithm with default parameters
communities = algorithms.rb_pots(G)

# Convert the detected communities to JSON format
communities_json = communities.to_json()

print(communities_json)
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