[m− supercluster] 3×10¹⁵ M☉ of negative mass — Janus N-body (3D rotation, 4K)

3D rotation of the most massive negative-mass halo in the Janus
N-body simulation (V-6 production run, N = 22×10⁶ particles,
L = 250 Mpc, μ = 19, snapshot z = 0, t = 15.87 Gyr).

This object (m− halo 0, archetype "supercluster_max_mass") is
the top-mass m− structure in the FoF catalog at z = 0 and marks
the transition to a new regime in the Janus playlist: the m−
sector hosts structures on completely different scales than
the m+ sector seen in the companion playlist.

- M_FoF = 3.13 × 10¹⁵ M☉ (cluster-cosmological scale)
- N_part = 110,595 m− particles (within R_FoF)
- R_FoF = 11.77 Mpc (~ 4 × larger than halo m+ 0)
- R_50 = 3.69 Mpc
- v_circ_max = 1,464 km/s (~ 18 × larger than halo m+ 0)
- σ_v = 1,564 km/s (typical of massive clusters)
- λ_Bullock = 0.057
- Inertia axes a:b:c = 6.82 : 6.62 : 2.44 Mpc (oblate)
- Morphology : irregular
- μ_local = 0.0009 (m+ deficit, 60× below the neutral baseline)
- n+(2R) / n−(2R) = 259 / 274,822
- Currently in fusion (typical of m− structures at z = 0)

━━━ WHY THIS MATTERS ━━━

Note on μ_local convention : here μ_local = n+(2R) / n−(2R),
i.e. the local positive-to-negative number ratio. The neutral
baseline (uniform mixture at the global Janus ratio μ = 19) is
1/19 ≈ 0.053, shown as the dashed line in the μ_local(r) panel.
Any value BELOW this baseline signals a m+ deficit (anti-
Newtonian exclusion).

The contrast with the m+ playlist is the central message:

• m+ halos in Janus have galaxy-scale masses (~10¹² M☉,
R ~ 2 Mpc). They are sparse objects swimming in a sea
of m− matter.

• m− halos reach cluster-cosmological scales (~10¹⁵ M☉,
R ~ 12 Mpc). They DOMINATE the large-scale structure
and expel m+ matter over many Mpc.

The local m+/m− ratio (μ_local = 0.0009) is 60 times below
the neutral baseline. In the central 2 R_FoF, only 259 m+
particles are found against 274,822 m− particles. The m+
field is essentially empty over 35 × 35 Mpc — the supercluster
carves a m+ void at the scale of the cosmic web.

This is the symmetric counterpart of the m− cavity seen in
m+ halos (halo_21 in companion playlist), but inverted and
amplified by 3 orders of magnitude in mass.

Observational counterparts: massive galaxy cluster catalogs
(Planck SZ, ACT, eROSITA, Euclid), with predicted weak-lensing
signal of inverted sign relative to standard ΛCDM cluster
profiles.

━━━ TECHNICAL ━━━

Resolution : 4K UHD (3836 × 2158)
Codec : HEVC (H.265) 10-bit
Frame rate : 15 fps
Duration : 60 s (2× full 360° rotation, looped)
Color : m− in cool tones (blue), m+ density field overlay
(orange) — inverted convention vs the m+ playlist

The 3D scatter panel reveals the merger kinematics: a central
red core (m− particles in radial outflow from the COM, signature
of the recent merger) surrounded by a blue envelope (infalling
m− material from the surrounding cosmic web). The oblate
geometry (a:b:c = 6.82:6.62:2.44 Mpc) is consistent with a
post-merger relaxation phase.

Source data : V-6 production run, Rust/CUDA on RTX 3060 GPU,
~6.5 h wall-time. FoF halo catalog: 25,848 m− halos at z = 0.

━━━ JANUS PLAYLIST ━━━

Complete archetype series — m− sector (cluster scale):
• m− halo 0 (supercluster_max_mass) — largest m− structure [this video]
• m− halo 5 (total_pcavity) — total m+ exclusion
• m− halo 110 (shallowest_pcavity) — universality of the cavity

Companion playlist — m+ sector (galaxy scale, 1000× less massive):
see channel page.

━━━ LINKS ━━━

Paper (Zenodo) : https://doi.org/10.5281/zenodo.20310634
Code (GitHub) : https://github.com/ajp-git/janus-sim
ORCID : https://orcid.org/0009-0003-5110-2840

#JanusModel #supercluster #darkmatter #astrophysics #negativemass #bimetricgravity #galaxyclusters #largeScaleStructure #cosmologicalsimulation #alternativecosmology #cosmologicaltensions #Planck #eROSITA #Euclid #cosmology

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