die Fachwelt
expert community
The entirety of the experts and specialists in a particular field.
Die neue Studie wurde von der Fachwelt mit großem Interesse aufgenommen.
The new study was received with great interest by the expert community.

expert community
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expert community
The entirety of the experts and specialists in a particular field.
Die neue Studie wurde von der Fachwelt mit großem Interesse aufgenommen.
The new study was received with great interest by the expert community.

The word is made up of 'das Fach' (in the sense of field or subject area) and 'die Welt' (world). So it figuratively describes the 'world' of all experts in a particular field.
Die Entdeckung wurde in der gesamten Fachwelt diskutiert.
The discovery was discussed throughout the entire expert community.
'Die Fachwelt' (the expert community) is a collective term and is used almost exclusively in the singular, even when referring to experts from many different countries. A plural form is practically nonexistent.
Die Fachwelt ist sich uneinig über die Interpretation der Daten.
The expert community is divided over the interpretation of the data.
Common formulations are 'in der Fachwelt' (in the expert community) or 'von der Fachwelt' (by the expert community). They describe the opinion or reaction of the expert community.
Sein Buch wurde von der Fachwelt sehr gelobt.
His book was highly praised by the expert community.
public
'die Öffentlichkeit' and 'die Fachwelt' both refer to groups of people who can respond to a topic. The difference lies in how large and specialized this group is. 'die Öffentlichkeit' means the general public, so not just experts. 'die Fachwelt' means the experts in a particular field. Learners may confuse the words because both can seem like an audience. But if only specialists are meant, 'Fachwelt' is more precise. If all people or broader society are meant, 'Öffentlichkeit' fits.

Die neue Studie wurde in der Fachwelt intensiv diskutiert.
The new study was discussed intensively in the expert community.
Der Fall interessierte bald die ganze Öffentlichkeit.
The case soon interested the whole public.