###################### # GENERAL PARAMETERS # ###################### # Plummer softening parameter (can be even 0) eps = 1E-4 # End time of the calculation t_end = 0.25 # Interval of snapshot files output (xxxxxx.dat) dt_disk = 1.0 # Interval for the energy control output (contr.dat) dt_contr = 0.125 # Interval for SMBH output (bh.dat, bh_neighbors.dat, and bh_inf.dat) dt_bh = 0.125 # Parameter for timestep determination eta = 0.01 # Name of the input file; use "data.con" in most cases inp_data = data.con ##### NOT IMPLEMENTED ####################### output_format = HDF5 dt_min_warning = false ############################################# #################### # EXTERNAL GRAVITY # #################### ext_units_physical = true norm_mass = 1e5 norm_length = 10 # TODO add the option to normalize using other units # Notice that if physical units are used, the "a" and "b" parameters are in kiloparsec, not parsec! ext_m_bulge = 0 ext_b_bulge = 0 ext_m_disk = 1e9 ext_a_disk = 0.8 ext_b_disk = 0.2 ext_m_halo_plummer = 0 ext_b_halo_plummer = 0 #################################### ## LIVE SUPERMASSIVE BLACK HOLE(S) # #################################### # ## There is special treatment for particles representing supermassive black holes (SMBHs): they are integrated at every time step, they can have custom softening in SMBH-SMBH interactions, and post Newtonian terms can be added to the gravity. # ## The number of SMBH particles. Can be 0 (no SMBH), 1, or 2. [default: 0] #live_smbh_count = 0 # ## Custom softening length for SMBH-SMBH interactions (can also be zero). If non-negative, the custom softening is applied. [default: -1] #live_smbh_custom_eps = 0 # ## Output additional diagnostics about live SMBHs. [default: false] ##TODO# dt_bh #live_smbh_output = true # ## Output additional diagnostics about the SMBH's (or SMBHs') nearest neighbours (number could be set as shown below). [default: false] #live_smbh_neighbor_output = true # ## Number of nearest neighbours to the SMBH (or SMBHs) to include in output. [default: 10] #live_smbh_neighbor_number = 10 # ################################### ## BINARY SUPERMASSIVE BLACK HOLE # ################################### # ## The following parameters can be set when `live_smbh_count` is 2. # ## Output additional diagnostics about the SMBH's sphere of influence (size could be set as shown below). [default: false] #binary_smbh_influence_sphere_output = true # ## The influence sphere is centred at the binary SMBH's centre of mass, and its radius is the semi-major axis of the binary times the factor below. [default: 10.0] #binary_smbh_influence_radius_factor = 3.162277660168379497918067e+03 # ## Add post Newtonian terms to SMBH-SMBH gravity. [default: false] #binary_smbh_pn = true # ## A mask array (zeros and ones) determining whether or not to use specific post-Newtonian terms. ## The elements represent {0, 1, 2, 2.5, 3, 3.5, spin} #pn_usage = {1, 1, 1, 1, 0, 0, 0} # ## The speed of light in N-body units [default: 500] #pn_c = 477.12 # ##################################### ## Negative powers of two # ##################################### ## -1 1/2 0.5 # ## -2 1/4 0.25 # ## -3 1/8 0.125 # ## -4 1/16 0.0625 # ## -5 1/32 0.03125 # ## -6 1/64 0.015625 # ## -7 1/128 0.0078125 # ## -8 1/256 0.00390625 # ## -9 1/512 0.001953125 # ## -10 1/1024 0.0009765625 # ## -11 1/2048 0.00048828125 # ## -12 1/4096 0.000244140625 # ## -13 1/8192 0.0001220703125 # ## -14 1/16384 0.00006103515625 # ## -15 1/32768 0.000030517578125 # ## -16 1/65536 0.0000152587890625 # #####################################